Iranian Polymer Journal最新文献_第2页

Advances in hyperbranched polymer chemistry 超支化聚合物化学研究进展

IF 3.1 3区化学

Iranian Polymer Journal Pub Date : 2024-09-05 DOI: 10.1007/s13726-024-01379-6

Aleksei Maksimov, Bulat Yarullin, Kharlampii Kharlampidi, Gennadii Kutyrev

{"title":"Advances in hyperbranched polymer chemistry","authors":"Aleksei Maksimov, Bulat Yarullin, Kharlampii Kharlampidi, Gennadii Kutyrev","doi":"10.1007/s13726-024-01379-6","DOIUrl":"https://doi.org/10.1007/s13726-024-01379-6","url":null,"abstract":"<p>Hyperbranched polymers are densely packed macromolecules whose three-dimensional framework consists of a core and three or more branched short composite chains, namely dendrons. They have a spherical architecture and unique properties, such as nanoscale macromolecules (2–100 nm), high solubility, the presence of several branched chains, spatial voids and a large number of end functional groups. Various classes of hyperbranched polymers in the last 10 years such as polyalkanes, polyarylenes, polyhalides, organometallic polymers, polyethers, polyesters, nitrogen-containing and polyheterocyclic compounds are reviewed. These polymers can be readily obtained under mild conditions by polymerization, polycondensation or polycoupling reactions of polyfunctional monomers. The main characteristics confirming the hyperbranched structure of polymers are: low molecular weight, dispersity, medium degree of branching, large number of end functional groups, nanoscale macromolecules, three-dimensional architecture, presence of glass transition temperature, high solubility in various organic solvents, and low viscosity of polymer solutions. Due to their adaptable structures and special properties, hyperbranched polymers are widely used as hybrid materials and composites for structural applications, coatings, adhesives, membranes, catalysts, flame retardants, plasticizers, and light-emitting materials. The hyperbranched structure combined with low toxicity allows their use as highly effective nanoscale anticancer and bactericidal drugs, as well as contrast reagents for magnetic resonance tomography. The availability of technologically significant methods for the synthesis of hyperbranched polymers of various types makes it possible to carry out their industrial production on a scale sufficient for practical application in solving modern problems of biomedical chemistry and in many other branches of science and industry.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"32 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigating metal injection molding of 4605 low-alloy steel powder-polymer mixture: parametric optimization of the injection stage using RSM technique 研究 4605 低合金钢粉-聚合物混合物的金属注射成型：利用 RSM 技术对注射阶段进行参数优化

IF 3.1 3区化学

Iranian Polymer Journal Pub Date : 2024-09-03 DOI: 10.1007/s13726-024-01380-z

Sina Rezaei, Ali Askari

{"title":"Investigating metal injection molding of 4605 low-alloy steel powder-polymer mixture: parametric optimization of the injection stage using RSM technique","authors":"Sina Rezaei, Ali Askari","doi":"10.1007/s13726-024-01380-z","DOIUrl":"https://doi.org/10.1007/s13726-024-01380-z","url":null,"abstract":"<p>This work refines the metal injection molding (MIM) process for creating a bend-type thin-walled engine component from 4605 low-alloy steel. Utilizing a five-factor Box–Behnken design (BBD) and response surface methodology (RSM), we optimized the injection parameters. Differential scanning calorimetry (DSC) and rheology analysis helped establish the parameter ranges. The optimal injection conditions were determined to be as temperature of 155 °C, speed of 80 mm/s, holding pressure of 83 bar, holding time of 9 s, and injection pressure of 132 bar, resulting in an ideal green part density of 4.892 g/cm<sup>3</sup>. The injection pressure was found to be the most critical factor affecting the density of the prepared green part. A sample produced under these conditions closely matched the expected density, and after sintering, its density and hardness conformed to the MIM-4605 standards, demonstrating the effectiveness of the optimized parameters. This research work not only pinpointed the optimal conditions for the MIM process but also highlighted the significant role of injection parameters in determining quality of the parts. These findings provided valuable insights for the manufacturing industry, especially in the precision fabrication of engine components. Future research directions include expanding the study to different materials and geometries, evaluating long-term mechanical properties, incorporating machine learning for enhanced optimization, and assessing the environmental impact of the MIM process.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"50 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Functionalized lignin magnetic composites and their absorption capability for methylene blue and methyl orange in aqueous solution 功能化木质素磁性复合材料及其对水溶液中亚甲基蓝和甲基橙的吸收能力

IF 3.1 3区化学

Iranian Polymer Journal Pub Date : 2024-09-03 DOI: 10.1007/s13726-024-01381-y

Liang Shi, Xue Shen, Hongyun Qi, Xiaomei Zhang, Ruiwen Shu

{"title":"Functionalized lignin magnetic composites and their absorption capability for methylene blue and methyl orange in aqueous solution","authors":"Liang Shi, Xue Shen, Hongyun Qi, Xiaomei Zhang, Ruiwen Shu","doi":"10.1007/s13726-024-01381-y","DOIUrl":"https://doi.org/10.1007/s13726-024-01381-y","url":null,"abstract":"<p>A novel lignin-based magnetic composite was synthesized using a facile method, with epichlorohydrin (ECH) serving as a cross-linker to bond amino-functionalized magnetic nanoparticles (AMNP), polyethyleneimine (PEI), and sodium lignosulfonate (LS). The synthesized composite (AMNP/LS-PEI) was subjected to characterization through multiple analytical techniques, namely FTIR, XRD, BET, TG, VSM, XPS, FE-SEM, EDS, HRTEM, and TEM. Following the synthesis, a thorough investigation was conducted into the composite’s adsorption capabilities for methylene blue (MB) and methyl orange (MO) dyes through batch adsorption, taking into account pivotal factors, including pH, contact time, solution concentration, and temperature. The experimental data suggested that the adsorption of MO and MB onto AMNP/LS-PEI was in good accordance with the Langmuir isotherm model. The AMNP/LS-PEI demonstrated maximum adsorption capacities (<i>Q</i><sub>max</sub>) of 482.7 mg g<sup>−1</sup> for MO and 375.6 mg g<sup>−1</sup> for MB, respectively. The MB and MO-adsorption kinetics onto AMNP/LS-PEI closely fit the pseudo-second-order model. Furthermore, the thermodynamic analysis revealed that the adsorption process of dyes onto AMNP/LS-PEI was an endothermic one. Upon six adsorption–desorption cycles, AMNP/LS-PEI demonstrated sustained adsorption capacity, achieving removal rates of 81.3% for MB and 77.1% for MO, respectively. The potential advantage for practical applications lied in its highly selective adsorption capability for mixed solutions of MB and MO. Specifically, at a pH of 4, MO was preferentially adsorbed, whereas at a pH of 8, MB was favored for adsorption. In addition, the adsorption mechanism of AMNP/LS-PEI toward dyes was explored using FTIR and XPS, and was found to be mainly ascribed to the electrostatic interaction, hydrogen bonding interaction, and cation exchange.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"47 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal behavior, flame retardant and rheological properties of low density polyethylene filled with slag 填充矿渣的低密度聚乙烯的热行为、阻燃性和流变特性

IF 3.1 3区化学

Iranian Polymer Journal Pub Date : 2024-08-29 DOI: 10.1007/s13726-024-01371-0

Xin Yan, Yuying Zhou, Shangbin Mao, Yujian Chen, Chen Liu, Hao Wu, Hu Wang, He-xin Zhang, Jian-ming Yang, Keun-Byoung Yoon

{"title":"Thermal behavior, flame retardant and rheological properties of low density polyethylene filled with slag","authors":"Xin Yan, Yuying Zhou, Shangbin Mao, Yujian Chen, Chen Liu, Hao Wu, Hu Wang, He-xin Zhang, Jian-ming Yang, Keun-Byoung Yoon","doi":"10.1007/s13726-024-01371-0","DOIUrl":"https://doi.org/10.1007/s13726-024-01371-0","url":null,"abstract":"<p>In recent years, the massive discharge and irrational accumulation of slag have led to the waste of land resources and serious environmental pollution problems. In this work, to explore the potential applications of slag, it was modified with silane coupling agent 3-aminopropyltriethoxysilane (KH-550) to improve its compatibility with polymer matrix. A series of low density polyethylene (LDPE)/modified slag (MS) composites were prepared using melt blending method. The results showed that the introduction of MS significantly improved the thermal and mechanical properties of LDPE in comparison to those of its pure form. The tensile strength, tensile modulus, and <i>T</i><sub><i>d5%</i></sub> of the LDPE/MS composites with 40 wt% MS content were enhanced by 58%, 113%, and 19.9 ℃, respectively. Furthermore, dynamic rheological analysis revealed that a higher MS filler content resulted in a higher restriction on the movement of the LDPE molecular chains. The application of slag in LDPE provides a feasible method of recycling slag and promoting sustainable development.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"104 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acrylonitrile styrene acrylate (ASA) treated jute/manila hemp epoxy-based hybrid composites for enhanced structural performance 经丙烯腈-苯乙烯-丙烯酸酯 (ASA) 处理的黄麻/马尼拉麻环氧基混合复合材料可提高结构性能

IF 2.4 3区化学

Iranian Polymer Journal Pub Date : 2024-08-28 DOI: 10.1007/s13726-024-01378-7

Mukesh Kumar Nag

{"title":"Acrylonitrile styrene acrylate (ASA) treated jute/manila hemp epoxy-based hybrid composites for enhanced structural performance","authors":"Mukesh Kumar Nag","doi":"10.1007/s13726-024-01378-7","DOIUrl":"10.1007/s13726-024-01378-7","url":null,"abstract":"<p>The efficacy of a 3% ASA copolymer is examined in augmenting the mechanical properties of natural fiber composites. The batching process, which includes softening, lubricating, and conditioning, is applied in fibers, such as woven jute and non-woven manila hemp. This process is employed in the development of woven jute/epoxy, non-woven manila hemp/epoxy, and combined woven jute/non-woven manila hemp/epoxy composites to investigate their impact on their mechanical characteristics. Through various characterization methods, it was found that significant enhancements were observed in hybrid composites, particularly in the woven jute/non-woven manila hemp/epoxy composite. These enhancements include a maximum tensile strength of 52 MPa, a tensile modulus of 1.67 GPa, an impact strength of 9.6 kJ/m<sup>2</sup>, and a flexural strength of 90 MPa. The observed improvements are attributed to the influence of a hard chain copolymer, with a glass transition temperature of 25.05 °C determined from differential scanning calorimetry (DSC) curves. Fiber surface treatment using a semi-continuous seeded emulsion polymerization method significantly impacts properties, enhancing fiber–matrix adhesion and mechanical performance, resulting in a 14% increase in both tensile and flexural modulus compared to untreated composites. Analytical techniques such as emulsion particle-size measurements using dynamic light scattering (DLS) and SEM further support these findings.</p>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"34 2","pages":"259 - 275"},"PeriodicalIF":2.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization and statistical analysis on mechanical, thermal, wear and water-absorption characteristics of fragrant screwpine fiber-reinforced polymer biocomposites 芳香螺松纤维增强聚合物生物复合材料机械、热、磨损和吸水特性的优化与统计分析

IF 3.1 3区化学

Iranian Polymer Journal Pub Date : 2024-08-28 DOI: 10.1007/s13726-024-01377-8

Ananth Rajkumar, Martin Thangaraj Gerald Arul Selvan, Victor Neto, Ramasamy Satheesh Raja, Joseph Selvi Binoj, Brailson Mansingh Bright

{"title":"Optimization and statistical analysis on mechanical, thermal, wear and water-absorption characteristics of fragrant screwpine fiber-reinforced polymer biocomposites","authors":"Ananth Rajkumar, Martin Thangaraj Gerald Arul Selvan, Victor Neto, Ramasamy Satheesh Raja, Joseph Selvi Binoj, Brailson Mansingh Bright","doi":"10.1007/s13726-024-01377-8","DOIUrl":"https://doi.org/10.1007/s13726-024-01377-8","url":null,"abstract":"<p>A novel biocomposite material has been developed by reinforcing indigenous natural fragrant screwpine (FSP) fiber with polyester resin. Different sets of biocomposite materials are prepared using untreated and chemically treated (3%, 5%, 7% and 9% by weight of NaOH and sodium lauryl sulfate) FSP fibers for different concentration, time (1 h and 3 h) and fiber lengths (3 mm and 9 mm). The tensile, flexural and impact strength of the developed composites samples were studied and optimized through Design of Experiments (DOE). The NaOH (3% for 3 h) treated 9 mm fiber length FSP fibers reinforced polymer composite (FSPFRPC) shows a better tensile (53.17 MPa), flexural (65.84) and impact (21 J/m) strength than the untreated and other chemically treated FSP polymer composites. The strong bonding of the modified augmentation material with the matrix was analyzed from the sample images obtained from scanning electron microscopy. The DOE has been also employed to provide mathematical equation for optimization purpose. The heat resilience of the FSPFRPC samples was interrogated through thermogravimetric—derivative thermogravimetric analysis (TGA-DTG) to appreciate its performance under higher ambient temperature conditions which is revealed as 192 °C. The pin-on-disk experimentation helped to understand the wear behavior of the composite samples with minimum mass loss of 0.125 g. The water-absorption analysis performed on the composite samples revealed its behavior under humid conditions.</p><h3 data-test=\"abstract-sub-heading\">Graphical abstract</h3>\u0000","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"25 1","pages":""},"PeriodicalIF":3.1,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Benzothiazole-based poly(phenoxy-imine)s containing ethoxy and methoxy units: synthesis, thermal and optical properties 含有乙氧基和甲氧基单元的苯并噻唑基聚（苯氧基亚胺）：合成、热学和光学特性

IF 2.4 3区化学

Iranian Polymer Journal Pub Date : 2024-08-23 DOI: 10.1007/s13726-024-01376-9

İsmet Kaya, Emin Dinçer, Hatice Karaer Yağmur

{"title":"Benzothiazole-based poly(phenoxy-imine)s containing ethoxy and methoxy units: synthesis, thermal and optical properties","authors":"İsmet Kaya, Emin Dinçer, Hatice Karaer Yağmur","doi":"10.1007/s13726-024-01376-9","DOIUrl":"10.1007/s13726-024-01376-9","url":null,"abstract":"<div><p>Schiff bases (S1 and S2) were synthesized from the condensation reaction of 2-amino-6-ethoxybenzothiazole with 3-hydroxy-4-methoxybenzaldehyde and 3-hydroxy-4-ethoxybenzaldehyde. P-S1-A and P-S2-A poly(phenoxy-imine)s, and P-S1-O and P-S2-O poly(phenoxy-imine)s were synthesized through oxidative polycondensation (P) of S1 and S2 by NaOCl oxidant in alkaline (A) solution (10% KOH aquation solution) and by H<sub>2</sub>O<sub>2</sub> (35% aquation solution) in THF organic (O) medium, respectively. The structures of the Schiff bases and poly(phenoxy-imine)s were characterized by FTIR, NMR, UV–Vis and TG/DTA investigations. The limit oxygen index (LOI) and heat-resistance index temperature (T<sub>HRI</sub>) values were determined from thermogravimetric analysis data of compounds. The LOI values of poly(phenoxy-imine)s were between 21.16 and 33.87. The molecular weight distributions and glass transition temperatures of poly(phenoxy-imine)s were determined from gel permeation chromatography (GPC) and DSC, respectively. The M<sub>n</sub> values of P-S1-O, P-S1-A, P-S2-O and P-S2-A were found to be 5800, 15500, 5600 and 9400 Da, respectively. Moreover, the polymerization degree (DP) values of P-S1-O, P-S1-A, P-S2-O and P-S2-A were calculated to be 18, 16, 47 and 28, respectively. The glass transition temperature (T<sub>g</sub>) of P-S1-O, P-S1-A, S2, P-S2-O and P-S2-A were calculated from DSC curves at 115, 111, 102 and 128 °C, respectively. The surface images of poly(phenoxy-imine)s were determined with SEM analysis. The optical bandgap values of Schiff bases and poly(phenoxy-imine)s were calculated from UV–Vis measurements. The optical bandgap value of P-S2-A was calculated to be 1.95 eV.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"34 2","pages":"247 - 258"},"PeriodicalIF":2.4,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterization of 3s-PLA/CS/nHA drug-loaded composites by supercritical carbon dioxide technology 利用超临界二氧化碳技术制备 3s-PLA/CS/nHA 药物负载复合材料并确定其特性

IF 2.4 3区化学

Iranian Polymer Journal Pub Date : 2024-08-20 DOI: 10.1007/s13726-024-01373-y

Guoqian Yang, Mengmeng Liu, Yingfeng Su, Chi Yu

{"title":"Preparation and characterization of 3s-PLA/CS/nHA drug-loaded composites by supercritical carbon dioxide technology","authors":"Guoqian Yang, Mengmeng Liu, Yingfeng Su, Chi Yu","doi":"10.1007/s13726-024-01373-y","DOIUrl":"10.1007/s13726-024-01373-y","url":null,"abstract":"<div><p>Amidst the relentless innovation in materials science and bone tissue engineering, the quest for next-generation bone graft materials with bespoke functionalities has emerged as a pivotal research domain. This study produced and characterized a novel bone healing material. First, we explained how three-armed polylactic acid (3s-PLA) was created in supercritical carbon dioxide (ScCO<sub>2</sub>) and utilized as a matrix material. Following that, we described how the solution blending approach was employed to create three-armed polylactic acid/chitosan/nanohydroxyapatite (3s-PLA/CS/nHA) composites. The composites were then drug-loaded with prednisone acetate as a model drug utilizing the supercritical impregnation technique. Ultimately, the Ritger-Peppas model was substantially followed by the drug release of the drug-loaded composites when the in vitro drug-release kinetics of the drug-loaded materials were investigated. The porous structure of 3s-PLA was demonstrated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and nuclear magnetic resonance (NMR) hydrogen spectroscopy. Morphologic studies using scanning electron microscopy (SEM) revealed the homogeneous distribution of drug in the matrix of the mixtures as well as the porous structure of 3s-PLA and 3s-PLA/CS/nHA. The hydrophilicity of 3s-PLA/CS/nHA was examined by the use of water contact angle (WCA), revealing that the material in question has a hydrophilic water contact angle of 45.69°. Furthermore, research was conducted using one-way tests and investigations to characterize in vitro drug-release carrier materials under various drug conditions and temperatures. The carrier material consistently released up to 84.8% of prednisone acetate over the course of 72 h, demonstrating good control over prolonged release, according to the results.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"34 2","pages":"221 - 233"},"PeriodicalIF":2.4,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Poly(aniline-co-melamine)/polyurethane coating as a novel microwave absorbing material for potential stealth application 聚（苯胺-共甲胺）/聚氨酯涂层作为一种新型微波吸收材料，具有潜在的隐形应用价值

IF 2.4 3区化学

Iranian Polymer Journal Pub Date : 2024-08-20 DOI: 10.1007/s13726-024-01372-z

Hassan Ahmadi, Peyman Najafi Moghadam, Ehsan Nazarzadeh Zare, Javad Norinia

{"title":"Poly(aniline-co-melamine)/polyurethane coating as a novel microwave absorbing material for potential stealth application","authors":"Hassan Ahmadi, Peyman Najafi Moghadam, Ehsan Nazarzadeh Zare, Javad Norinia","doi":"10.1007/s13726-024-01372-z","DOIUrl":"10.1007/s13726-024-01372-z","url":null,"abstract":"<div><p>Nowadays, due to the rapid development of electromagnetic devices, it is necessary to prepare materials absorbing electromagnetic waves to reduce the harmful effects of these radiations on the environment and human health. Another application of these coatings is in the military, defense and aerospace industries. In this work, new microwave absorbing coatings with good adhesion were prepared by in situ polymerization of polyurethane in the presence of synthesized polyaniline and/or poly(aniline-<i>co</i>-melamine). The prepared materials were characterized by FTIR, XRD, TGA, DSC and SEM analyses. SEM images showed that the formation of nanotube particles in the copolymer was obtained in a molar ratio of 1 to 4 of melamine to aniline in a copolymerization feed. Polyurethane/poly(aniline-<i>co</i>-melamine) nanocomposite showed a better performance in microwave absorption ability than polyaniline/polyurethane, and the highest reflection loss in AM41 sample was −12.28 and −10.78 dB that appeared in the frequencies of 11.42 and 10.52 GHz, respectively. The electrochemical behavior of polyurethane/poly(aniline-<i>co</i>-melamine) nanocomposite was investigated using cyclic voltammetry and electrochemical impedance spectroscopy, and the results showed similar capacitive behavior for AM41 and AM10 nanocomposites, which proved that the change in morphology of AM41 caused better performance in absorbing microwaves.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"34 2","pages":"235 - 245"},"PeriodicalIF":2.4,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of twin-roll temperature and interface adhesion on ablative performance and char structure of ethylene propylene diene monomer-based ablative insulator 双辊温度和界面附着力对乙丙二烯单体基烧蚀绝缘体烧蚀性能和炭化结构的影响

IF 2.4 3区化学

Iranian Polymer Journal Pub Date : 2024-08-19 DOI: 10.1007/s13726-024-01370-1

Seyed Ahmad Koohrou, Abbas Kebritchi

{"title":"Effect of twin-roll temperature and interface adhesion on ablative performance and char structure of ethylene propylene diene monomer-based ablative insulator","authors":"Seyed Ahmad Koohrou, Abbas Kebritchi","doi":"10.1007/s13726-024-01370-1","DOIUrl":"10.1007/s13726-024-01370-1","url":null,"abstract":"<div><p>In a novel approach, the effect of twin-roll mixer temperature as well as fiber-matrix interaction on the ablation behavior and carbonized char structure was studied. Different ablative insulators based on ethylene propylene diene monomer (EPDM) were fabricated using a laboratory twin-roll mixer at cold (25 °C) and hot (60 °C) temperatures. Moreover, the effects of hydroxyl-terminated polybutadiene (HTPB), bis(3-triethoxysilylpropyl)tetra sulphane (SI-69) and polyethylene glycol 400 (PEG-400) as coupling agents at 2 and 3 phr levels were assessed. Curing rheometery, physical and mechanical testing, micro and macro-morphology images of insulator and char, thermal assesment and oxyacetylene torch test (<i>T</i><sub>flame</sub> = 3000 °C) were expolited. FE-SEM analysis of charred layers showed that PEG (2) EPDM-Hot, SI-69 (2) EPDM-Hot, and HTPB (3) EPDM-Cold samples (Table 1) formed a loose carbonized layer, which cannot resist under the oxyacetylene flame, resulting in low ablative resistance. The micro-morphology of hot processed samples displayed more compatible interplanar layers. The HTPB Hot (3)-EPDM sample (Table 1) showed a higher <i>T</i><sub>g</sub> (− 49.63 °C), cross-linked density (6.83 10<sup>–4</sup> mol/cm<sup>3</sup>), tensile strength (5.11 MPa), thermal stability (<i>T</i><sub>max</sub> = 476.60 °C), char layer compression strength (about 600 N at 1.75 mm displacement) and better dispersion of filler in the matrix than the other samples. Remarkably, the use of a hot twin-roll mixer and an appropriate coupling agent simultaneously suggests a synergistic effect in increasing the ablation resistance (the lowest ablation rates of 0.07916 mm/s and 0.3758 g/s) in HTPB Hot (3)-EPDM sample through better distribution and interaction of the fillers with the rubber matrix.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":601,"journal":{"name":"Iranian Polymer Journal","volume":"34 2","pages":"201 - 219"},"PeriodicalIF":2.4,"publicationDate":"2024-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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