Polymer最新文献 - Book学术

Synthesis, Characteristics and Thermally Induced Self-Assembly of Silicon-Based Thermo/Photo-Responsive Block Copolymers Prepared from Monomer Bearing Paired Side-Chain Azo Mesogens Using RAFT Process 利用 RAFT 工艺制备硅基热/光响应嵌段共聚物（由含有成对侧链偶氮中间体的单体制备）的合成、特性和热诱导自组装

IF 4.6 2区化学

Polymer Pub Date : 2024-11-21 DOI: 10.1016/j.polymer.2024.127867

Athmen Zenati, Kisan Koirala

{"title":"Synthesis, Characteristics and Thermally Induced Self-Assembly of Silicon-Based Thermo/Photo-Responsive Block Copolymers Prepared from Monomer Bearing Paired Side-Chain Azo Mesogens Using RAFT Process","authors":"Athmen Zenati, Kisan Koirala","doi":"10.1016/j.polymer.2024.127867","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127867","url":null,"abstract":"Novel silicon-based liquid crystalline (LC) monomer (CASPA) and corresponding Poly(MMA)-b-Poly(CASPA) diblock copolymers (DBCs) containing symmetric azobenzene mesogens in the side chain were successfully synthesized by coupling reaction and reversible addition-fragmentation chain transfer (RAFT) polymerization, respectively. Block copolymerization by RAFT proceeded with well-controlled manner in anisole solution involving new CASPA monomer, Poly(MMA)-RAFT macroinitiator and AIBN initiator, yielding Poly(MMA)-b-Poly(CASPA) DBCs with excellent control over molecular weights (Mw/Mn ≤ 1.39) and compositions. Chemical structures and properties of CASPA and Poly(MMA)-b-Poly(CASPA) were extensively studied using 1H NMR, FTIR, GPC, DSC, POM, AFM and GISAXS. The CASPA exhibited enantiotropic liquid crystallinity with nematic four-brush schlieren texture, while DBCs showed monotropic liquid crystallinity with batonnet textures of smectic A phase. All DBC films exhibited photochemical trans-cis isomerization and photoinduced phase transition from mesophase to isotropic phase under UV irradiation. Morphologies of DBC thin films under thermal annealing depended on volume ratio of building LC block relative to Poly(MMA) segment, DBC-2 containing approximately equal block volume fractions self-assembled into lamellar nanostructure with domain-spacing of 34 nm, whereas DBC-3 and DBC-4 possessing higher LC contents (65 wt% and 72 wt%) formed highly ordered hexagonal cylindrical nanostructures with domain-spacing ranging from 37 to 39 nm as evidence by AFM and GI-SAXS, conforming with the self-consistent field theory.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"38 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Anionic Polymers Formed by Dinuclear Rhodium Units and Dicyanide Silver/Gold Moieties 由双核铑单元和双氰基银/金分子形成的阴离子聚合物

IF 4.6 2区化学

Polymer Pub Date : 2024-11-20 DOI: 10.1016/j.polymer.2024.127861

Laura Abad Galán, Paula Cruz, Estefanía Fernández-Bartolomé, Miguel Cortijo, Patricia Delgado-Martínez, Rodrigo González-Prieto, Reyes Jiménez-Aparicio, José L. Priego

{"title":"Anionic Polymers Formed by Dinuclear Rhodium Units and Dicyanide Silver/Gold Moieties","authors":"Laura Abad Galán, Paula Cruz, Estefanía Fernández-Bartolomé, Miguel Cortijo, Patricia Delgado-Martínez, Rodrigo González-Prieto, Reyes Jiménez-Aparicio, José L. Priego","doi":"10.1016/j.polymer.2024.127861","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127861","url":null,"abstract":"The synthesis, characterization and structural determination of four complexes with formula (PPh4)n{[Rh2(μ-O2CPh)4][Au(CN)2]}n (1) and Kn{[Rh2(μ-O2CR)4][M(CN)2]}n (M = Au, R = CH2OEt (2), CH2OMe (3); M = Ag, R = CH2OMe (4)) are described. In all cases, the [CN-M-CN]– (M = Au, Ag) group is bridging the axial positions of the dirhodium units giving one-dimensional chains. The packing of the chains in the solid state depends on the nature of the carboxylate group of the dimetallic unit, the counterion present in the complex and the metal itself. The most striking change is observed in the Kn{[Rh2(μ-O2CCH2OMe)4][Au(CN)2]}n complex (3), where the chains are positioned perpendicular to each other with an Au···Au interchain distance of 2.963 Å. The emission studies of this complex upon excitation at 350 nm show a clear broad emission band centered at 430 nm, while no luminescence is observed for the other compounds. The appearance of emission properties only in the case of complex 3 can be explained by its short aurophilic interactions.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"18 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 of a novel porous organic polymer for selective extraction/determination of palladium ions from water samples 制备用于选择性萃取/测定水样中钯离子的新型多孔有机聚合物

IF 4.6 2区化学

Polymer Pub Date : 2024-11-20 DOI: 10.1016/j.polymer.2024.127858

Fatemeh Gandomkar, Mostafa Khajeh, Ali Reza Oveisi, Pouya Karimi, Hermenegildo García

{"title":"Preparation of a novel porous organic polymer for selective extraction/determination of palladium ions from water samples","authors":"Fatemeh Gandomkar, Mostafa Khajeh, Ali Reza Oveisi, Pouya Karimi, Hermenegildo García","doi":"10.1016/j.polymer.2024.127858","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127858","url":null,"abstract":"In this research, a new porphyrin-based porous organic polymer (POP), named here PPOP-UOZ-1 (UOZ stands for the University of Zabol), was synthesized through a solvothermal condensation reaction between 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (TAPP, Porph-NH2) and 2,2'-[ethane-1,2-diylbis(oxy)]dibenzaldehyde (Dialdehyde, DA). The chemical structure, morphology, and surface properties of the PPOP-UOZ-1 were assessed using numerous techniques, including TGA, BET, FT- IR, PXRD, and SEM/EDX. The nominal PPOP-UOZ-1 was then used as an adsorbent for selective (better than 92%) extraction of Pd(II) from aqueous solutions. The adsorption process was optimized by studying the effect of various factors such as pH, the type and volume of eluent, adsorption and desorption time, and the amount of adsorbent. The results exhibited that the maximum adsorption capacity of PPOP-UOZ-1 for Pd(II) was 208.3 mg/g at a pH of 3.0, based on the Langmuir isotherm model (a determination coefficient of 0.9887). The adsorbent showed excellent selectivity for Pd(II) over other coexisting metal ions, with a recovery rate higher than 92%. Furthermore, the PPOP-UOZ-1 could be reused for at least six adsorption-desorption cycles without substantial loss of efficiency. This proposed adsorbent and approach was further applicable for the efficient extraction of Pd(II) from environmental water samples.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"15 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142673191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Relationship between the molecular structure of polyimide and its dielectric properties: Optimizing performance for triboelectric nanogenerators 聚酰亚胺分子结构与其介电性能之间的关系：优化三电纳米发电机的性能

IF 4.6 2区化学

Polymer Pub Date : 2024-11-20 DOI: 10.1016/j.polymer.2024.127868

Songhao Mo, Hong Ruan, Yuqi Li

{"title":"Relationship between the molecular structure of polyimide and its dielectric properties: Optimizing performance for triboelectric nanogenerators","authors":"Songhao Mo, Hong Ruan, Yuqi Li","doi":"10.1016/j.polymer.2024.127868","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127868","url":null,"abstract":"Triboelectric nanogenerators (TENGs) are eco-friendly energy harvesters. Polyimide (PI) has been widely used as a triboelectric layer in TENGs, but the relationship between its structure and performance is not fully understood. Herein, PI films with varying molecular structures were prepared to investigate the effects of -O- and -CF3 groups on their physical properties and triboelectric performance. The results showed that PI films with -O- exhibited better thermal stability, while both -O- and -CF3 groups effectively modulated optical transparency and dielectric properties. At 450 nm, M6-PI and O6-PI exhibited the highest transmittance at 63.14% and 55.06%, respectively, with dielectric loss performance below 0.5% at 105 Hz. PI films incorporating -O- and -CF3 demonstrated significant improvements in triboelectric performance. Theoretical calculations clarified these groups influence optical transparency, dielectric properties, and electrical output performance. Ultimately, the fabricated 6PI-TENG achieved the desired triboelectric performance with enhanced electrical output. The Voc and Qsc of 6PI reached approximately 80 V and 25 nC, respectively. This study offers essential theoretical insights for designing and advancing of TENGs, contributing to sustainable energy development.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"4 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A New Method for Conductivity Prediction in Polymer Carbon Nanofiber System by the Interphase Size and Total Conductivity of Constituents 通过相间尺寸和成分总电导率预测聚合物碳纳米纤维体系电导率的新方法

IF 4.6 2区化学

Polymer Pub Date : 2024-11-20 DOI: 10.1016/j.polymer.2024.127869

Yasser Zare, Muhammad Tajammal Munir, Kyong Yop Rhee, Soo-Jin Park

{"title":"A New Method for Conductivity Prediction in Polymer Carbon Nanofiber System by the Interphase Size and Total Conductivity of Constituents","authors":"Yasser Zare, Muhammad Tajammal Munir, Kyong Yop Rhee, Soo-Jin Park","doi":"10.1016/j.polymer.2024.127869","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127869","url":null,"abstract":"Current modeling approaches for the conductivity of polymer composites containing carbon nanofiber (CNF) called as PCNFs exhibit limitations. Herein, we introduce an enhanced Ouali model to accurately forecast the PCNF conductivity by incorporating the operative CNF amount and the conductivity contributions of CNFs, interphase region, and tunneling zones. The effective CNF volume fraction is derived from the dimensions of both CNFs and interphase, while the overall conductivity calculation integrates the resistances of interphase region and tunnels. The model's accuracy is validated through empirical conductivity measurements of various PCNF samples and extensive parametric analyses. An interphase depth (t) of less than 8 nm renders the composite insulative, whereas peak conductivity of 0.04 S/m is achieved at an interphase depth of 40 nm and interphase conductivity of 400 S/m. These results underscore the significant influence of interphase depth and conductivity on the overall electrical performance of the composites. Furthermore, a CNF length (l) below 13 μm or a contact diameter (d) under 10 nm also results in an insulative composite. Conversely, maximum values of CNF length (80 μm) and contact diameter (40 nm) enhance the composite's conductivity to 0.1 S/m. These findings illustrate the advantageous impact of longer nanofibers and wider tunnels on the electrical conductivity of PCNFs.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"11 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Advancing Circular Economy: Comparative Analysis of Recycled and Virgin Carbon Fiber 3D Printed Composites on Performance and Eco-Efficiency 推进循环经济：再生碳纤维和原生碳纤维 3D 打印复合材料在性能和生态效益方面的比较分析

IF 4.6 2区化学

Polymer Pub Date : 2024-11-19 DOI: 10.1016/j.polymer.2024.127865

Muhammad Ateeq, Arslan Akbar, Muhammad Shafique

{"title":"Advancing Circular Economy: Comparative Analysis of Recycled and Virgin Carbon Fiber 3D Printed Composites on Performance and Eco-Efficiency","authors":"Muhammad Ateeq, Arslan Akbar, Muhammad Shafique","doi":"10.1016/j.polymer.2024.127865","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127865","url":null,"abstract":"Carbon fiber-reinforced polymer composites are widely used for their corrosion resistance, high strength, stiffness, and lightweight properties. However, the extensive use of carbon fiber generates significant waste at the end of its lifecycle. Recycling technologies can effectively recover carbon fiber from this waste, making it suitable for reuse in various applications. Recently, there has been a growing trend in using recycled carbon fiber as a reinforcement material in polymer matrices, offering a cost-effective alternative to virgin carbon fiber while maintaining excellent mechanical properties. However, most studies focus on the mechanical strength of parts made from recycled and virgin carbon fibers, with less attention given to the environmental impacts of these materials. The primary objective of this study is the comparative analysis of the specimens manufactured using recycled and virgin carbon fiber-reinforced polyamide-12 material based on the mechanical performance, life cycle cost, and environmental impact. The experimental investigations showed that the mechanical performance of the recycled carbon fiber polyamide-12 (rCFRP12) composites are more efficient than the specimens manufactured using the virgin carbon fiber polyamide-12 (vCFRP12) composites such as three-point bending test results show that parts made from rCFRP12 composites achieved a flexural strength of 56.25 MPa, outperforming those made with vCFRP12 (49.9 MPa). Additionally, the recycled composite specimens also exhibited higher tensile strength than their virgin carbon fiber counterparts. The life cycle analysis revealed that samples made with recycled carbon fiber have a lower environmental impact, reducing global warming, ozone depletion, and carcinogenic effects by 11.98% compared to those made with virgin carbon fiber. Additionally, the production cost of recycled carbon fiber is significantly lower than that of virgin carbon fiber.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"54 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142671048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Monitoring stress concentration in polymers with circular notch exploiting graphene-based sensors 利用石墨烯传感器监测带有圆形凹槽的聚合物中的应力集中情况

IF 4.6 2区化学

Polymer Pub Date : 2024-11-19 DOI: 10.1016/j.polymer.2024.127860

Elli Bellou, Anastasios C. Manikas, Maria Giovanna Pastore Carbone, Stella Peloni, Christos Tsakonas, Costas Galiotis

引用次数: 0

Epoxy resins containing sulfhydryl hyperbranched polysiloxane with desirable mechanical properties and lower curing temperature 含有巯基超支化聚硅氧烷的环氧树脂，具有理想的机械性能和较低的固化温度

IF 4.6 2区化学

Polymer Pub Date : 2024-11-19 DOI: 10.1016/j.polymer.2024.127859

Feifei Wang, Junyan Yao, Kaiming Yang, Bingrui Shi, Zhenlong Zhang, Weixu Feng, Hongxia Yan

{"title":"Epoxy resins containing sulfhydryl hyperbranched polysiloxane with desirable mechanical properties and lower curing temperature","authors":"Feifei Wang, Junyan Yao, Kaiming Yang, Bingrui Shi, Zhenlong Zhang, Weixu Feng, Hongxia Yan","doi":"10.1016/j.polymer.2024.127859","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127859","url":null,"abstract":"High-performance epoxy materials often necessitate curing at high-temperature, which can lead to defects, brittleness, deformation and processing difficulties. In this paper, the modifier sulfhydryl hyperbranched polysiloxane (HSiSH) was fabricated by the “one-pot” method. And investigated the effect of HSiSH on the curing temperature, mechanical and thermal properties of epoxy resin. The epoxy with the addition of 2.0 wt% HSiSH showcased superior comprehensive properties, including flexural strength of 159.37 MPa, impact strength of 24.77 kJ/m2, and tensile shear strength of 14.02 MPa, as well as the thermal properties are improved. Moreover, the presence of 2 wt% HSiSH can facilitate the curing process reducing the apparent activation energy by 12.25%. The highly branched topology, chain entanglement, \"rigid-flexible\" -Si-O-C- segment and active groups improve the strength and toughness of the material. Simultaneously, the numerous reactive groups within HSiSH actively participate in the curing reaction, thereby enhancing the adhesion between the resin and the substrate surface which increasing the bonding performance of the adhesive. This study lays a solid theoretical foundation for developing high-performance epoxy resins cured at lower and moderate temperatures.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"99 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Evaluation of Flexural strength of 3D-Printed Nylon with carbon reinforcement: An experimental validation using ANN 评估带有碳纤维增强材料的 3D 打印尼龙的抗弯强度：使用 ANN 进行实验验证

IF 4.6 2区化学

Polymer Pub Date : 2024-11-19 DOI: 10.1016/j.polymer.2024.127854

Vijay Kumar, Dhinakaran Veeman, Murugan Vellaisamy, Vikrant Singh

引用次数: 0

Controllable preparation of spinnable isotropic pitches for carbon fibers with high tensile strength from low-cost ethylene tar pitch by a selective photobromination–debromination method 利用选择性光溴化-脱溴方法，从低成本乙烯焦油沥青中可控制备高拉伸强度碳纤维用可纺各向同性沥青

IF 4.6 2区化学

Polymer Pub Date : 2024-11-19 DOI: 10.1016/j.polymer.2024.127862

Ganggang Zhai, Jianguang Guo, Yongsheng Tian, Guanming Yuan, Ye Cong, Baoliu Li, Qin Zhang, Yongting Chen, Xuanke Li, Zhijun Dong

{"title":"Controllable preparation of spinnable isotropic pitches for carbon fibers with high tensile strength from low-cost ethylene tar pitch by a selective photobromination–debromination method","authors":"Ganggang Zhai, Jianguang Guo, Yongsheng Tian, Guanming Yuan, Ye Cong, Baoliu Li, Qin Zhang, Yongting Chen, Xuanke Li, Zhijun Dong","doi":"10.1016/j.polymer.2024.127862","DOIUrl":"https://doi.org/10.1016/j.polymer.2024.127862","url":null,"abstract":"N-bromosuccinimide (NBS) has notable selectivity for brominating aromatic compounds with alkyl side chains. This study employs NBS in lieu of liquid bromine to prepare spinnable isotropic pitch derived from ethylene tar pitch (ETP) using a selective photobromination-debromination approach. The prepared isotropic pitches were then utilized to fabricate isotropic pitch-based carbon fibers (IPCFs) through a process involving melt spinning, oxidative stabilization, and subsequent carbonization. As the amount of NBS added increases in the photobromination stage, the softening point, pitch yield, average molecular weight, and degree of polymerization of the resulting isotropic pitch gradually increase, whereas its spinnability first improves but then decreases. Compared with the isotropic pitch manufactured through thermal polymerization alone, the isotropic pitch that undergo photobromination–debromination exhibits a more linear molecular structure formed by methylene/ethylidene-bridged aromatic units. This molecular structure enhances its spinnability, significantly improving the mechanical performance of the resulting IPCFs. The isotropic pitch produced with 15 wt% NBS during photobromination demonstrates exceptional spinnability, yielding carbon fibers with excellent mechanical characteristics. These fibers exhibit a tensile strength of 1333 MPa, Young’s modulus of 64 GPa, and an elongation property of 2.4%. This work provides a new method for the high value-added utilization of ET by controlling the molecular structure of the pitch precursor.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"2 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142670982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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