International Journal of Polymer Analysis and Characterization最新文献_第3页

Graft copolymerization of carboxymethylcellulose with solketal acrylate 羧甲基纤维素与丙烯酸酯溶胶的接枝共聚

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2445671

Khaled Beyaz , Emeline Vedrenne , Carlos Vaca-Garcia , Sophie Thiebaud-Roux , Ahmed Benaboura , Nabila Haddadine

{"title":"Graft copolymerization of carboxymethylcellulose with solketal acrylate","authors":"Khaled Beyaz , Emeline Vedrenne , Carlos Vaca-Garcia , Sophie Thiebaud-Roux , Ahmed Benaboura , Nabila Haddadine","doi":"10.1080/1023666X.2024.2445671","DOIUrl":"10.1080/1023666X.2024.2445671","url":null,"abstract":"<div><div>The objective of this work is to synthesize new materials based on cellulose fiber. In this study, we presented the synthesis of a new biomaterial by conducting graft polymerization of 2,2-dimethyl-1,3-dioxolan-4-yl methyl acrylate (DMDMA solketal acrylate) onto carboxymethylcellulose (CMC), using KPS as an initiator. We conducted several experiments to determine the optimal conditions for preparing this biopolymer, varying the reaction time and the ratio between the initiator and the monomer. The results revealed that the highest grafting yield, 52%, was obtained after 72 min at 65 °C, with 6.26 mmol of KPS/eq OH and 4.43 moles of DMDMA/eq OH, using THF as a solvent. FTIR spectroscopy confirmed the grafting of monomers onto the CMC. Thermogravimetry showed that the degradation of the grafted CMC occurs in two stages, unlike the degradation of the CMC, which occurs in a single stage, confirming the modification of the starting product. SEM images clearly show the morphological difference between the CMC and the grafted CMC. The BET analysis reveals moderate adsorption at low pressure, followed by a marked increase at high pressure, indicating the presence of mesopores. The hysteresis between adsorption and desorption also suggests closed pore structures. The pore size distribution shows a predominance of pores between 30 and 100 Å, providing an optimal specific surface area for small molecule adsorption and catalytic reactions. This mesoporous profile is suitable for adsorption and catalysis applications. To our knowledge, our study represents the first use of the synthesized monomer, DMDMA solketal acrylate, for grafting onto the structure of CMC, highlighting the originality of our research.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 190-201"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of decorated polyborosiloxane for enhancing the flame retardancy and mechanical property of epoxy resin 用于增强环氧树脂阻燃性和力学性能的装饰型聚硼硅氧烷的合成

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2425720

Xiaoliang Zeng , Hua Mao , Qijun Liu , Fuxiang Li , Xinsheng Lan , Fangqiang Wang , Yu Song , Mingwei Li , Tianhao Zhang

{"title":"Synthesis of decorated polyborosiloxane for enhancing the flame retardancy and mechanical property of epoxy resin","authors":"Xiaoliang Zeng , Hua Mao , Qijun Liu , Fuxiang Li , Xinsheng Lan , Fangqiang Wang , Yu Song , Mingwei Li , Tianhao Zhang","doi":"10.1080/1023666X.2024.2425720","DOIUrl":"10.1080/1023666X.2024.2425720","url":null,"abstract":"<div><div>In this work, the decorated polyborosiloxane (MAPBS) with phosphorus-nitrogen components was first synthesized via a hydrolysis-condensation reaction and thus incorporated the MAPBS filler into epoxy resin (EP) to fabricate composites by a simple blending method. It could be found that the MAPBS with epoxy groups showed a good dispersion level in the EP matrix, endowing EP composites with superior flame retardancy and mechanical properties. Thanks to the combination of phosphorus-, nitrogen-, boron-, and silica-containing units in MAPBS filler, the addition of 6 wt% MAPBS made EP achieve significantly improved limiting oxygen index (25.2 ± 0.5%) and UL-94 rating (V1). Meanwhile, cone calorimeter test results revealed that the peak heat release rate (PHRR), total heat release (THR), and total smoke production (TSP) of the EP-MAPBS6 composite were reduced by 31%, 62%, and 67%, respectively, as compared to the pure EP. In addition, the MAPBS6 composite exhibited balanced tensile strength (105.1 MPa) and elongation at break (87.6%) among the prepared samples. The present work provides an effective strategy to fabricate EP composites with improved comprehensive performances.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 98-108"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tamarind gum based magnesium ion conducting polymer membrane for energy storage applications 罗望子胶基镁离子导电聚合物储能膜

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2416212

P. Saranya , K. Sundaramahalingam , D. Vanitha , M. Nandhinilakshmi , V. N. Vijayakumar

{"title":"Tamarind gum based magnesium ion conducting polymer membrane for energy storage applications","authors":"P. Saranya , K. Sundaramahalingam , D. Vanitha , M. Nandhinilakshmi , V. N. Vijayakumar","doi":"10.1080/1023666X.2024.2416212","DOIUrl":"10.1080/1023666X.2024.2416212","url":null,"abstract":"<div><div>A solid bio polymer electrolyte (SPE) based on tamarind gum (TG) and magnesium nitrate was synthesized by a solution casting technique. The amorphous behavior is observed by X-ray diffraction (XRD) analysis, and the degree of crystallinity is calculated from the XRD deconvolution spectra. The interaction between the polymer and the salt was confirmed by Fourier transform infrared (FTIR) analysis. Using FTIR deconvolution spectra, the percentage of free ions can be calculated. The glass transition temperature (T<sub>g</sub>) was determined via differential scanning calorimetry (DSC). A higher ionic conductivity (σ) of 1.97 × 10<sup>−4</sup> S/cm is observed for the sample with 1 g of tamarind gum and 0.5 g of magnesium nitrate (4 TMN). The conduction mechanism shows that sample 4 TMN obeys the quantum mechanical tunneling model (QMT) at low frequency. The prepared SPEs follow the Arrhenius behavior, and the minimum activation energy (E<sub>a</sub>) of 0.207 eV is observed for sample 4 TMN. The lowest relaxation time (τ) was 3.46 × 10<sup>−7</sup> s for 4-TMN according to the tangent spectra. The transference number of ions (t<sub>ion</sub>) is calculated by Wagner’s polarization method. The electrochemical stability window observed by linear sweep voltammetry (LSV) is 2.25 V. The primary battery is fabricated by using sample 4TMN, and an open circuit voltage (OCV) of 2.01 V is observed.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 1-25"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Induction of physico-chemical properties in mercerized Yucca filamentosa fiber-based graft copolymer through response surface methodology and its characterization 响应面法诱导丝光丝兰纤维基接枝共聚物的理化性质及其表征

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2419050

Surjit Kaur , Mithu Maiti Jana , Asim Kumar Jana

{"title":"Induction of physico-chemical properties in mercerized Yucca filamentosa fiber-based graft copolymer through response surface methodology and its characterization","authors":"Surjit Kaur , Mithu Maiti Jana , Asim Kumar Jana","doi":"10.1080/1023666X.2024.2419050","DOIUrl":"10.1080/1023666X.2024.2419050","url":null,"abstract":"<div><div>This research article describes the physicochemical modification of mercerized <em>Yucca filamentosa (Yf<sub>m</sub>)</em> fiber by graft copolymerization with ethylmethacrylate, using ferrous ammonium sulfate-potassium persulfate (FAS-KPS) as a redox initiator. Initially, six process parameters; reaction duration, reaction temperature, solvent amount, pH, FAS:KPS ratio, and monomer concentration were used in the study in a sequential experimental design technique, and the significant process variables affecting the yield of the graft copolymer were identified. The resolution-V design method identified the significant parameters as the reaction temperature, amount of solvent, and the concentration of monomer. In second phase of the study, the screened variables were utilized in the development of a model through the technique of response surface methodology (RSM) for the prediction of the yields, and its optimization. The developed RSM model fitted well with the experimental data, and predicted for the optimal conditions of reactions as reaction duration 120 min, pH 7.0, and the monomer 2.96 × 10<sup>−3 </sup>mol/L; at which the highest graft yield percentage obtained was 133.7%. The techniques of FTIR, SEM, and XRD were used for the characterization of untreated fiber, mercerized fiber, and graft copolymers. Studies of the various physico-chemical properties showed that the produced graft copolymers were more resistant to acid and base than the both natural and mercerized fibers.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 26-46"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraction, characterization, and evaluation of galactomannan from Barbatimão Verdadeiro as a potential additive for enhanced oil recovery fluids barbaratim<e:1> o Verdadeiro中半乳甘露聚糖作为一种潜在的提高采收率的添加剂的提取、表征和评价

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2025-01-02 DOI: 10.1080/1023666X.2024.2421817

Mariana S. Aquino , Juliana P. Senna , Claudia R. E. Mansur

{"title":"Extraction, characterization, and evaluation of galactomannan from Barbatimão Verdadeiro as a potential additive for enhanced oil recovery fluids","authors":"Mariana S. Aquino , Juliana P. Senna , Claudia R. E. Mansur","doi":"10.1080/1023666X.2024.2421817","DOIUrl":"10.1080/1023666X.2024.2421817","url":null,"abstract":"<div><div>Polymers play a crucial role in enhanced oil recovery (EOR) by increasing the viscosity of injection fluids and enhancing oil displacement. The widely used polymer, partially hydrolyzed polyacrylamide (HPAM), faces performance degradation in high-salinity and high-temperature environments. This study explores galactomannan from <em>Stryphnodendron polyphyllum</em> seeds as an alternative viscosifying agent for EOR fluids. An extraction process for galactomannan from Barbatimão Verdadeiro seeds was developed, yielding 23.3% m/m. The biopolymer was characterized using Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), thermogravimetric analysis (TGA), and size exclusion chromatography (SEC). Rheological behavior was tested in brines of different salinities, and injectivity/filterability tests were performed following API RP 63:1990 standards. The galactomannan obtained from <em>Stryphnodendron polyphyllum</em> exhibited a mannose-to-galactose ratio of 1.32. Rheological analysis showed pseudoplastic behavior, with viscosities of 38 cP in brine solutions at 7.37 s<sup>−1</sup> and 60 °C. Filterability tests demonstrated satisfactory injectivity with factors of 1.09 (8 µm) and 0.67 (1.2 µm). Compared to HPAM, galactomannan exhibited superior viscosity retention in high-salinity conditions, where HPAM dropped to 6 cP. The galactomannan extracted from <em>Stryphnodendron polyphyllum</em> seeds is a promising biopolymer for EOR applications, offering superior performance under harsh conditions compared to traditional HPAM. Its resilience to high salinity and temperature makes it a viable alternative for pre-salt and offshore fields, contributing to more sustainable and efficient oil recovery.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 1","pages":"Pages 68-82"},"PeriodicalIF":1.7,"publicationDate":"2025-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Technique for measuring the low pull-out forces of bonded fibers: application to glue-based false eyelashes 测定粘合纤维低拔出力的技术：在胶基假睫毛上的应用

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2024-12-31 DOI: 10.1080/1023666X.2024.2441939

Nathan Macdonald , Jimmy Mays

{"title":"Technique for measuring the low pull-out forces of bonded fibers: application to glue-based false eyelashes","authors":"Nathan Macdonald , Jimmy Mays","doi":"10.1080/1023666X.2024.2441939","DOIUrl":"10.1080/1023666X.2024.2441939","url":null,"abstract":"<div><div>Until now, no method has been reported for measuring fiber pull-out forces in false eyelashes. Many false eyelashes are handmade and are comprised of poly(butylene terephthalate) (PBT) lashes with glue bases. Due to their small size, delicate nature, and complexity with regards to varying depths of embedment, angle of attachment of fibers to the base, and physical interactions between fibers of false eyelashes, conventional tensile testing machines are not able to grip individual lashes and accurately measure the small forces of detachment. In this work, a custom tensile testing instrument was used to investigate the effect of an approximately 120 °C curling step on the strength of adhesion of PBT fibers to the glue base. To account for the effects of structural complexity on the mechanical pull-out strength of individual fibers, 20 individual fibers were pulled from 11 different models of eyelashes, both before and after curling. A Kolmogorov-Smirnov normality test was employed to assure the data collected were normally distributed, and means and standard deviations were calculated. A two-tailed t-test revealed that 10 of the 11 tested eyelash models showed no statistically significant difference in mechanical strength before versus after the curling process.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 133-141"},"PeriodicalIF":1.7,"publicationDate":"2024-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Layered double hydroxide reinforced thermal expansion fire extinguishing agent for potential solid fire prevention 层状双氢氧化物增强热膨胀灭火剂，用于潜在固体防火

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2024-12-26 DOI: 10.1080/1023666X.2024.2444293

Weining Du , Yaqiang Jiang , Mingqiang Yan , Zejiang Zhang , Jun Deng , Zhicheng Xie

{"title":"Layered double hydroxide reinforced thermal expansion fire extinguishing agent for potential solid fire prevention","authors":"Weining Du , Yaqiang Jiang , Mingqiang Yan , Zejiang Zhang , Jun Deng , Zhicheng Xie","doi":"10.1080/1023666X.2024.2444293","DOIUrl":"10.1080/1023666X.2024.2444293","url":null,"abstract":"<div><div>In this work, phosphorus-decorated Zn-Al-CO<sub>3</sub> layered double hydroxide (PLDH) was prepared via a co-precipitation strategy and thus introduced into intumescent flame retardant dispersion to fabricate PLDH-reinforced thermal expansion fire extinguishing agent (FEA@PLDH). It was found that the phosphorus-containing unit was successfully anchored onto the PLDH. The prepared FEA@PLDH solution with a viscosity of 146 mPa·s exhibited good interfacial compatibility with the ethylene-vinyl acetate (EVA) surface. Taking advantage of the synergistic catalytic carbonization and expanded insulating barrier effects of FEA@PLDH, the corresponding coated EVA (EVA-FEA@PLDH1) with 1 wt% of PLDH could form a continuous and compact carbonaceous block layer under fire or high-temperature conditions. Meanwhile, the LOI for EVA-FEA@PLDH1 was increased from 22.0% to 32.0% and reached the UL-94 rating of V0. Moreover, EVA-FEA@PLDH1 showed delayed TTI (77 s) and T<sub>PHRR</sub> (146 s), with 6% and 44% reductions in THR and TSP, respectively, and 43% increment in residual char, as compared to the EVA-FEA. In addition, fire resistance experiment revealed that EVA-FEA@PLDH1 could withstand the ∼1300 °C flame for 467 s longer than that of the EVA-FEA (171 s). This research provides an intriguing fire extinguishing agent for the potential fire prevention of flammable polymer materials.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 142-154"},"PeriodicalIF":1.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of PPy/CeO2 nanocomposites for supercapacitor application 超级电容器用PPy/CeO2纳米复合材料的合成

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2024-12-21 DOI: 10.1080/1023666X.2024.2440504

M. Vinitha , G. Velraj , K. Anandan , G. K. Meenatchi , Muthaiah Shellaiah

{"title":"Synthesis of PPy/CeO2 nanocomposites for supercapacitor application","authors":"M. Vinitha , G. Velraj , K. Anandan , G. K. Meenatchi , Muthaiah Shellaiah","doi":"10.1080/1023666X.2024.2440504","DOIUrl":"10.1080/1023666X.2024.2440504","url":null,"abstract":"<div><div>Polypyrrole is synthesized by the chemical oxidation polymerization method with K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub> as an oxidant, and H<sub>2</sub>SO<sub>4</sub> as a dopant. This method was effective, as indicated by the large yield of PPy/CeO<sub>2</sub> (Polypyrrole/Cerium oxide) nanocomposite produced during synthesis. FT-IR spectra demonstrated the chemical interactions between PPy and CeO<sub>2</sub> nanoparticles. The prepared polypyrrole and polypyrrole nanocomposites were studied through structural and optical studies using XRD and UV-Vis analysis. Average crystalline sizes of PPy and PPy/CeO<sub>2</sub> nanocomposites are found to be 10.4 and 8.84 nm. The electrical conductivity of polypyrrole is lower than that of polypyrrole nanocomposite, which could be attributed to the inadequate hydration water as well as the surface conductivity carried through the thin polymer layer. In comparison to n-CeO<sub>2</sub>PPy (433 F/g) and PPy (226 F/g) at the scan rate of 100 mV/s, the electrochemical measurements demonstrated that the fabricated electrode of n-CeO<sub>2</sub>PPy is a suitable electrode material and can improve the capacitive performance of supercapacitors due to its high capacitive value (433 F/g). Electrochemical studies showed that CeO<sub>2</sub>PPy nanocomposites (n-CeO<sub>2</sub>PPy) have improved specific capacitance and reduced impedance compared to PPy. These improvements can be attributed to the synergistic effects between PPy and CeO<sub>2</sub>PPy nanocomposites, which facilitate efficient charge transport and ion diffusion.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 122-132"},"PeriodicalIF":1.7,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143176508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","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 sodium chloride and water-soluble polymers on thermochromic properties of hydroxypropyl cellulose solution 氯化钠和水溶性聚合物对羟丙基纤维素溶液热致变色性能的影响

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2024-12-10 DOI: 10.1080/1023666X.2024.2435853

Ha Ngoc Giang , Dung Thi Phuong Truong , Xuan Kim Hoang , Tuan Nguyen Anh Huynh

{"title":"Effect of sodium chloride and water-soluble polymers on thermochromic properties of hydroxypropyl cellulose solution","authors":"Ha Ngoc Giang , Dung Thi Phuong Truong , Xuan Kim Hoang , Tuan Nguyen Anh Huynh","doi":"10.1080/1023666X.2024.2435853","DOIUrl":"10.1080/1023666X.2024.2435853","url":null,"abstract":"<div><div>Hydroxypropyl cellulose (HPC) and its rather low lower-critical-solution-temperature (LCST) were the main research targets in many recent publications. In this study, a simple and affordable approach to measure LCST using a Brookfield viscometer was presented. The setup using a popular hot plate and a silicone oil bath could well detect the HPC solution’s LCST values. The result was in good agreement with the particle size change obtained using the dynamic light scattering technique. The effect of polyacrylic acid (PAA) and other cellulose derivatives including hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC), or sodium carboxymethyl cellulose (CMC) on HPC’s LCST was investigated. The mixture of HPC with PAA, HPMC, and CMC showed the lowest LCST. However, the effect of NaCl seemed to be stronger when the LCST value of only 28.5 °C was obtained with 1 wt% of HPC and 5 wt% of NaCl. Fourier-transformed infrared spectroscopy results also showed a stronger interaction of HPC/NaCl compared to the mixture with PAA of HPMC. The differential scanning calorimetry only detected the signal change correlated with LCST in the cooling cycle. The glass window fabricated with the current thermochromic solution was able to block and transmit visible light well at low and elevated temperatures, respectively.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"30 2","pages":"Pages 109-121"},"PeriodicalIF":1.7,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, rheological and thermal studies of Gum ghatti-cl-poly(acrylic acid) hydrogels containing CoFe2O4 nanoparticles 含 CoFe2O4 纳米颗粒的 Gum ghatti-cl-poly(acrylic acid) 水凝胶的合成、流变学和热学研究

IF 1.7 4区工程技术

International Journal of Polymer Analysis and Characterization Pub Date : 2024-10-24 DOI: 10.1080/1023666X.2024.2410746

Pragnesh N. Dave , Pradip M. Macwan , Bhagvan Kamaliya

{"title":"Synthesis, rheological and thermal studies of Gum ghatti-cl-poly(acrylic acid) hydrogels containing CoFe2O4 nanoparticles","authors":"Pragnesh N. Dave , Pradip M. Macwan , Bhagvan Kamaliya","doi":"10.1080/1023666X.2024.2410746","DOIUrl":"10.1080/1023666X.2024.2410746","url":null,"abstract":"<div><div>In this work, Gum ghatti-cl-poly(acrylic acid)/CoFe<sub>2</sub>O<sub>4</sub> (GGAACF) hydrogels were synthesized using a free radical polymerization technique, with CoFe<sub>2</sub>O<sub>4</sub> nanoparticles incorporated via a co-precipitation method using nitrates as precursors. Thermal gravimetric analysis (TGA) revealed that the inclusion of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles enhanced the thermal stability of the hydrogels. Swelling studies indicated that the addition of 30 mg of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles maximized water retention. Rheological assessments demonstrated non-Newtonian behavior, with flow curves fitted best by the Power Law model. The incorporation of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles significantly improved the hydrogel’s elasticity and viscosity, as evidenced by a higher storage modulus (G′) compared to the loss modulus (G″) across all frequencies, indicating the elastic nature of the hydrogels. The decrease in complex viscosity with increasing frequency confirmed the pseudoplastic properties of the hydrogels, attributed to the random alignment of CoFe<sub>2</sub>O<sub>4</sub> nanoparticles within the matrix. Tan δ values were below unity at all tested frequencies, underscoring the hydrogels’ strong elastic properties. These findings highlight the effectiveness of rheological analysis in characterizing the viscoelastic behavior of polymer hydrogels, which can be tailored for various applications.</div></div>","PeriodicalId":14236,"journal":{"name":"International Journal of Polymer Analysis and Characterization","volume":"29 8","pages":"Pages 658-674"},"PeriodicalIF":1.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0