Polymer最新文献_第2页

Polyaramides from Oxacalix[2]arene[2]hetarene monomers 由草萼芳烃-芳烃-芳烃-六烯单体合成的聚酰胺

IF 4.5 2区化学

Polymer Pub Date : 2025-07-26 DOI: 10.1016/j.polymer.2025.128859

Salvatore J. Fruciano, Daniel M. Knauss

{"title":"Polyaramides from Oxacalix[2]arene[2]hetarene monomers","authors":"Salvatore J. Fruciano, Daniel M. Knauss","doi":"10.1016/j.polymer.2025.128859","DOIUrl":"10.1016/j.polymer.2025.128859","url":null,"abstract":"<div><div>Three dicarboxylic acid-functional oxacalix[2]arene[2]hetarenes were synthesized from 3,5-dihydroxybenzoic acid and heteroaromatic dihalides for use as large, difunctional monomers. The oxacalixarene cyclic monomers were prepared by nucleophilic aromatic substitution and purified by recrystallization. The monomers were polymerized with oxydianiline using Higashi-Yamazaki phosphorylation to produce oxacalixarene polyaramides. The molecular weights were characterized by gel permeation chromatography to show large polydispersities that were attributed to substantial cyclic oligomer content. The low molecular weight cyclic byproducts were removed by Soxhlet extraction and their molecular weights and cyclic nature characterized by MALDI-TOF mass spectrometry. Experimental and computational evidence suggests a strong relationship between the shape of the macrocycle and intramolecular cyclization. Copolymerization with terephthalic acid resulted in decreased cyclic oligomer production. Mechanical properties of the polymers revealed Young's moduli in the range of 1.7–3.8 GPa, elongations from 0.6 to 16.2 %, and breaking strengths of 18.2–45.9 MPa. Homopolymers tended to display brittle fracture properties while copolymers exhibited mostly ductile fracture. The work is a rare example where macrocycles have been incorporated into linear polymer structures and the first known report of oxacalixarenes used in step-growth polycondensations.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"336 ","pages":"Article 128859"},"PeriodicalIF":4.5,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144712437","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

π-bridge-engineered naphthalenediimide copolymers for all-polymer photodetectors with high specific detectivity 高比探测全聚合物光电探测器用π桥工程萘二酰亚胺共聚物

IF 4.5 2区化学

Polymer Pub Date : 2025-07-26 DOI: 10.1016/j.polymer.2025.128852

Jiawei Liu , Xin Wang , Huaxin Zhu , Yunchao Li , Bohao Lv , Wenqiang Qiao

{"title":"π-bridge-engineered naphthalenediimide copolymers for all-polymer photodetectors with high specific detectivity","authors":"Jiawei Liu , Xin Wang , Huaxin Zhu , Yunchao Li , Bohao Lv , Wenqiang Qiao","doi":"10.1016/j.polymer.2025.128852","DOIUrl":"10.1016/j.polymer.2025.128852","url":null,"abstract":"<div><div>Conjugated acceptor polymers have emerged as promising candidates for all-polymer photodetectors (all-PPDs). However, precise molecular structure modulation remains essential to optimize their optoelectronic properties for specific applications. Recent advances have led to a shift from homopolymers to donor-acceptor (D-A) conjugated copolymers to improve device performance. Notably, dual-acceptor architectures(A1-D-A2-D) have shown potential in extending absorption spectra through synergistic electronic effects. In this study, three naphthalenediimide (NDI)-based acceptor polymers with thienopyrrodione (TPD) as the secondary acceptor moieties were designed and prepared via direct arylation polymerization: P(NDI-TPD) (dual-acceptor), P(NDI-T-TPD) (single thiophene π-bridge), and P(NDI-TT-TPD) (thieno[3,2-b] thiophene π-bridge). Systematic investigations revealed that π-bridge engineering significantly modulates molecular planarity, charge delocalization, and energy level alignment. When blended with donor polymers J71 or PTB7-Th, PTB7-Th:P (NDI-TT-TPD)-based devices exhibited broadest response range (300–800 nm) with a peak responsivity of 238.3 mA W<sup>−1</sup> and a maximum specific detectivity of 4.9 × 10<sup>13</sup> Jones at a bias voltage of −0.1 V. The combination of exceptional linear dynamic range (71.8 dB) and microsecond-scale response speed further validates their potential in real-time imaging systems. This work establishes π-bridge engineering as a powerful strategy for developing high-performance all-PPDs, providing fundamental guidelines for molecular design of conjugated acceptor polymers with tailored optoelectronic properties.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"335 ","pages":"Article 128852"},"PeriodicalIF":4.5,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710804","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

Tuning the Poly(glycerol itaconate)’s Michael Adducts: Post-Reaction Pathways to Functionalization 调节聚衣康酸甘油的迈克尔加合物：反应后的功能化途径

IF 4.6 2区化学

Polymer Pub Date : 2025-07-26 DOI: 10.1016/j.polymer.2025.128857

Magdalena Miętus, Aleksandra Bandzerewicz, Tomasz Gołofit, Kamil Wierzchowski, Maciej Pilarek, Michał Grzymajło, Agnieszka Gadomska-Gajadhur

{"title":"Tuning the Poly(glycerol itaconate)’s Michael Adducts: Post-Reaction Pathways to Functionalization","authors":"Magdalena Miętus, Aleksandra Bandzerewicz, Tomasz Gołofit, Kamil Wierzchowski, Maciej Pilarek, Michał Grzymajło, Agnieszka Gadomska-Gajadhur","doi":"10.1016/j.polymer.2025.128857","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128857","url":null,"abstract":"C=C double bonds in the poly(glycerol itaconate) backbone facilitate its functionalization through post-polymerization reactions. Among these, aza- and thio-Michael addition reactions hold the potential for improving material properties, yet their application to poly(glycerol itaconate) remains underexplored. To address this gap, we synthesized poly(glycerol itaconate) (esterification degree = 71.0%) using non-toxic and biodegradable itaconic acid and glycerol, followed by its modification via Michael addition with L-cysteine (modification degree = 24.8-96.9%), a non-toxic alternative to diamines previously used in similar reactions. The successful functionalization of poly(glycerol itaconate) was confirmed through FTIR, NMR, and thermal analyses, verifying the presence of Michael adducts. The hydrophilicity of the crosslinked materials was demonstrated by wet contact angle measurements (<90°), while cytotoxicity tests on 24-hour extracts indicated no cytotoxic effects in the two tested samples (>70%). These findings underscore the potential of poly(glycerol itaconate) derivatives as promising materials for further applications, such as tissue engineering and related fields.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"21 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710809","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

Floral-structured bimetallic Co/Ni@CuBTC for enhancing the EMW absorption and fire safety of epoxy: an integrated solution for radar stealth, fire retardant and thermal management 花卉结构双金属Co/Ni@CuBTC用于增强环氧树脂的EMW吸收和防火安全性：雷达隐身，阻燃和热管理的集成解决方案

IF 4.6 2区化学

Polymer Pub Date : 2025-07-26 DOI: 10.1016/j.polymer.2025.128856

Xiang Dong, Xiaoyu Jiang, Zhiyu Sun, Yan Ma, Yan Li, Zixin Lin, Shibin Nie, Konghu Tian

{"title":"Floral-structured bimetallic Co/Ni@CuBTC for enhancing the EMW absorption and fire safety of epoxy: an integrated solution for radar stealth, fire retardant and thermal management","authors":"Xiang Dong, Xiaoyu Jiang, Zhiyu Sun, Yan Ma, Yan Li, Zixin Lin, Shibin Nie, Konghu Tian","doi":"10.1016/j.polymer.2025.128856","DOIUrl":"https://doi.org/10.1016/j.polymer.2025.128856","url":null,"abstract":"For the application of intelligent equipment in fire rescue and anti-terrorism, the urgent need of shell materials with comprehensive performance, including radar wave absorption and fire safety, is raised. This study presents the epoxy resin (EP) composite incorporating a floral-structured bimetallic Co/Ni@CuBTC (ACM) with enhanced EMW absorption, flame retardancy and thermal management. The results show that the absorption rate of ACM at 3 mm thickness reaches -42.25 dB for 11.5 GHz EMW, and the dissipation to radar waves at -180<sup>o</sup> to 180<sup>o</sup> in radar cross section (RCS) simulation reaches -40.2 dB. The EP composite with 5 wt% ACM can block cell phone (800 MHz) and Bluetooth signals (2.4 GHz) at 3 mm thickness. The EP composite with 3 wt% ACM-3 (EP/ACM 3 %) presented the lowest peak heat release rate of 811.2 kW·m<sup>-2</sup>, which decreased by 39.5 % compared with pure EP, meanwhile it reached the V-1 rate in UL-94 test, showing a significant improvement in flame retardancy. The thermal conductivity (λ) of EP/ACM 3 % reached 0.811 Wm<sup>-1</sup>K<sup>-1</sup>, which is 21.9 % higher than that of pure EP, reducing the risk of heat accumulation. The EP/ACM composite, with its integrated capabilities in EMW absorption, flame retardant and thermal management, holds promising applications in unmanned fire rescue and anti-terrorism in future.","PeriodicalId":405,"journal":{"name":"Polymer","volume":"10 1","pages":""},"PeriodicalIF":4.6,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710819","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

Facile preparation of poly(pyrrole methane) modified melamine sponge as 3D recyclable adsorbent for Cr(VI) removal 聚吡咯甲烷改性三聚氰胺海绵三维可回收吸附剂的制备

IF 4.5 2区化学

Polymer Pub Date : 2025-07-26 DOI: 10.1016/j.polymer.2025.128861

Feiya Xu , Yajun Ji , Kun Fang , Zihe Jin , Yanping Xie , Lingyun Zheng

{"title":"Facile preparation of poly(pyrrole methane) modified melamine sponge as 3D recyclable adsorbent for Cr(VI) removal","authors":"Feiya Xu , Yajun Ji , Kun Fang , Zihe Jin , Yanping Xie , Lingyun Zheng","doi":"10.1016/j.polymer.2025.128861","DOIUrl":"10.1016/j.polymer.2025.128861","url":null,"abstract":"<div><div>The insufficient adsorption activity and poor solid-liquid separation performance limit the practical application of powder polypyrrole (PPy)-based adsorbents. Thus, poly(pyrrole methane), a PPy derivative, was synthesized and loaded onto melamine sponge to construct a 3D polymer adsorbent (MS@PPm), which could simultaneously address the two defects of traditional PPy adsorbents. The obtained MS@PPm contained abundant N- and O-containing sites, which were beneficial for Cr(VI) removal. The results in static batch experiments demonstrated that the elimination of Cr(VI) by MS@PPm was beneficial with lower pH values. The adsorption process agreed with pseudo-second-order kinetic model, implying that Cr(VI) was adsorbed onto MS@PPm by chemisorption. The saturated adsorption capacity of MS@PPm achieved 320.56 mg g<sup>−1</sup>, which was superior than that of most PPy-based and other adsorbents in literatures. MS@PPm also showed prominent specificity for Cr(VI) adsorption even with coexisting anions. The removal rate still exceeded 82.43 % after 5 cycles, exhibiting an excellent regeneration and utilization performance. Moreover, Cr(VI) can be continuously removed by MS@PPm, and the removal efficiency exceeded 90 % in the 100 h continuous dynamic column experiments. The adsorption mechanism study revealed that Cr(VI) can not only be adsorbed onto MS@PPm by electrostatic attraction and ion-exchanging interactions, but also can be transformed to harmfulless Cr(III) and complexed on adsorbent. This study implied that MS@PPm had great potential for Cr(VI) remediation in water.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"336 ","pages":"Article 128861"},"PeriodicalIF":4.5,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710808","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

The effects of carbon nanotube and magnesium maleate on the performance of ethylene-propylene-diene monomer (EPDM)/ polypropylene (PP) thermoplastic vulcanizate (TPV) with good shape memory behavior and electrical conductivity 研究了碳纳米管和马来酸镁对具有良好形状记忆性能和导电性的三元乙丙/聚丙烯热塑性硫化胶（TPV）性能的影响

IF 4.1 2区化学

Polymer Pub Date : 2025-07-25 DOI: 10.1016/j.polymer.2025.128854

Mengmeng Xu, Chengzhong Zong

{"title":"The effects of carbon nanotube and magnesium maleate on the performance of ethylene-propylene-diene monomer (EPDM)/ polypropylene (PP) thermoplastic vulcanizate (TPV) with good shape memory behavior and electrical conductivity","authors":"Mengmeng Xu, Chengzhong Zong","doi":"10.1016/j.polymer.2025.128854","DOIUrl":"10.1016/j.polymer.2025.128854","url":null,"abstract":"<div><div>The type of EPDM/PP TPV was the most widely used TPV with excellent mechanical property. To achieve functional property of EPDM/PP TPV, the EPDM/PP TPV compatibilized by magnesium maleate (MgMA) and maleic anhydride (MAH) was compounded with carbon nanotube (CNT) during dynamic vulcanization. The hydroxyl on CNT could reacted with the anhydride group on the graft products of polymer chains that promoted the uniform dispersion of CNT in TPV. The EPDM/PP TPV with excellent shape memory performance and electrical conductivity was successfully prepared. The successful reaction of CNT with anhydride on polymer chains in the compatibilized TPV M5C2 was verified by the result of FTIR, Raman spectrum and SEM image, which improved the mechanical performance, shape memory property and electrical conductivity of TPV M5C2 compared to TPV M0C2 with the same CNT content. TPV M5C1 obtained excellent shape memory performance with the R<sub>f</sub> of 96.0 % and R<sub>r</sub> of 93.9 %. The electrical conductivity of TPV M5C8 was as high as 1.6 × 10<sup>−4</sup> S·cm<sup>−1</sup> demonstrating the formation of CNT conductive network in TPV.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"335 ","pages":"Article 128854"},"PeriodicalIF":4.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710839","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

"High-performance mixed matrix membranes with very-high ZIF-8 loading for efficient CO2 capture" 高ZIF-8负载的高效CO2捕集高性能混合基质膜

IF 4.5 2区化学

Polymer Pub Date : 2025-07-25 DOI: 10.1016/j.polymer.2025.128858

Carole Arnal-Herault , Thomas Arzoumanian , Maria Valentina Velasco Rueda , Bouchra Belaissaoui , Marc Ponçot , Nathalie Steunou , Subharanjan Biswas , Eliane Espuche , Anne Jonquieres

{"title":"\"High-performance mixed matrix membranes with very-high ZIF-8 loading for efficient CO2 capture\"","authors":"Carole Arnal-Herault , Thomas Arzoumanian , Maria Valentina Velasco Rueda , Bouchra Belaissaoui , Marc Ponçot , Nathalie Steunou , Subharanjan Biswas , Eliane Espuche , Anne Jonquieres","doi":"10.1016/j.polymer.2025.128858","DOIUrl":"10.1016/j.polymer.2025.128858","url":null,"abstract":"<div><div>Addressing the challenges of climate change and global warming, membrane separation processes are considered as innovative industrial solutions. Among different membrane materials, mixed matrix membranes are very promising for CO<sub>2</sub> capture. In this work, a segmented poly(urea-imide) with high poly(ethylene oxide) content (70 % wt) was selected as a new rubbery polymer matrix and was doped with the metal organic framework ZIF-8. The new polymer matrix and the optimization of the “priming” method enabled to obtain very high ZIF-8 loadings up to 70 % vol. Various physicochemical methods were used to study the influence of filler/polymer interactions on the membrane's morphology. The CO<sub>2</sub> and N<sub>2</sub> permeation properties were evaluated by time-lag measurements for both pure gases under standard conditions for CO<sub>2</sub> post-combustion capture (2 bar and 35 °C). Very promising membrane performances were achieved for the highest ZIF-8 loading (70 % vol) with a strong increase of the CO<sub>2</sub> permeability P<sub>CO2</sub> = 471 Barrer (x 8.5 compared to the pristine polymer) and a relatively high ideal selectivity α<sub>CO2/N2</sub> = 30.2. The modeling of the MMM's performances was successfully achieved with Maxwell model up to high ZIF-8 content (60 % vol).</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"336 ","pages":"Article 128858"},"PeriodicalIF":4.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710840","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

Surface-engineered hexagonal boron nitride via RAFT-synthesized methacrylates for enhanced dispersibility and tribological performance in castor oil 利用raft合成的甲基丙烯酸酯制备表面工程六方氮化硼，增强其在蓖麻油中的分散性和摩擦学性能

IF 4.5 2区化学

Polymer Pub Date : 2025-07-25 DOI: 10.1016/j.polymer.2025.128855

Sema Karslioglu , İbrahim Akeyshi , Ramazan Karslioglu

{"title":"Surface-engineered hexagonal boron nitride via RAFT-synthesized methacrylates for enhanced dispersibility and tribological performance in castor oil","authors":"Sema Karslioglu , İbrahim Akeyshi , Ramazan Karslioglu","doi":"10.1016/j.polymer.2025.128855","DOIUrl":"10.1016/j.polymer.2025.128855","url":null,"abstract":"<div><div>Hexagonal boron nitride (h-BN) is a promising solid lubricant and oil additive due to its high thermal stability and chemical inertness; however, its poor dispersibility in non-polar media limits practical use. In this study, a monomer-level hydrophobic design strategy was employed to overcome this issue. Methacrylate monomers were synthesized by Steglich esterification of 2-hydroxyethyl methacrylate (HEMA) with pentanoic, lauric, or palmitic acid, followed by RAFT polymerization using a carboxyl-functional chain transfer agent. The resulting homopolymers were covalently grafted onto hydroxylated h-BN nanosheets to yield hybrid nanostructures with tailored hydrophobic side chains. Structural analysis confirmed the formation of well-defined polymers and preservation of h-BN's layered structure after grafting. Dispersion tests in castor oil over 21 days revealed that short-chain polymers enhanced stability, while long chains led to sedimentation due to hydrophobic aggregation. Tribological performance was evaluated under boundary lubrication using a ball-on-disc tribometer. Friction coefficients, wear rates, and wear morphologies were analyzed. Notably, h-BN grafted with poly(lauryl methacrylate) (PLAMA) achieved the lowest steady-state friction coefficient (0.0646) and wear rate (0.01132 mm<sup>3</sup>/N·m), corresponding to 59 % reduction in friction and 86 % in wear compared to neat castor oil. These improvements are attributed to improved oil compatibility, interfacial adhesion, and tribofilm formation. This study demonstrates how polymer design governs dispersion and tribological behaviour, offering a scalable approach to engineering oil-compatible 2D lubricant additives.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"335 ","pages":"Article 128855"},"PeriodicalIF":4.5,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144710821","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

Synthesis, characterization of a novel high heat-resistant soluble fluorinated sulfur-containing polyimide for gas separation 一种新型高耐热可溶含氟含硫气体分离聚酰亚胺的合成与表征

IF 4.1 2区化学

Polymer Pub Date : 2025-07-24 DOI: 10.1016/j.polymer.2025.128831

Xiuyuan Wei , Chao Shan , Zhongying Liu , Zhiqing Liang , Hui Wu , Chanjuan Liu , Xiaohua Huang

{"title":"Synthesis, characterization of a novel high heat-resistant soluble fluorinated sulfur-containing polyimide for gas separation","authors":"Xiuyuan Wei , Chao Shan , Zhongying Liu , Zhiqing Liang , Hui Wu , Chanjuan Liu , Xiaohua Huang","doi":"10.1016/j.polymer.2025.128831","DOIUrl":"10.1016/j.polymer.2025.128831","url":null,"abstract":"<div><div>A novel sulfur-and fluorine-containing dianhydride monomer 2,2-bis[4-(3,4-dicarboxyphenylthio)phenyl]hexafluoropropane dianhydride (6FDAPSA) was synthesized by molecular design, and a series of random co-polyimides were prepared from 6FDAPSA, 4,4-(hexafluoroisopropene)diphthalic anhydride (6FDA) and 4-(3-fluoro-4-(trifluoromethyl)phenyl)-2,6-bis(4-aminophenyl)pyridine (FTPPA). The obtained co-polyimides exhibited excellent thermal properties (<em>T</em><sub>g</sub> > 288 °C, <em>T</em><sub>5 %</sub> > 504 °C, <em>T</em><sub>10 %</sub> > 536 °C), good optical properties (λ<sub>cut-off</sub> > 342 nm, λ<sub>80 %</sub> > 410 nm), commendable mechanical properties (tensile strength >75 MPa) and outstanding hydrophobic properties (contact angle >90.0°). They also showed excellent solubility in both high and low boiling point organic solvents. Besides, Wide-angle X-ray diffraction test and molecular simulation confirmed that the prepared co-polyimides possess a large molecular chain spacing, with d-spacing values ranging from 5.59 to 5.84 Å and fractional free volume from 0.237 to 0.280. Consequently, polyimide membranes exhibited commendable gas permeability values of He (up to 49.5 barrer) and CO<sub>2</sub> (up to 34.2 barrer), and good ideal gas selectivity values of He/N<sub>2</sub> (up to 34.2) and CO<sub>2</sub>/N<sub>2</sub> (up to 22.2). These results indicate that polyimide matrix materials have potential application prospects in the field of gas separation.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"335 ","pages":"Article 128831"},"PeriodicalIF":4.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144693853","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

Enhancing the thermo-oxidative stability of polyamide 6 by scalable melt-blending with PEG-grafted glycol lignin 聚乙二醇接枝木质素可扩展熔融共混提高聚酰胺6的热氧化稳定性

IF 4.1 2区化学

Polymer Pub Date : 2025-07-24 DOI: 10.1016/j.polymer.2025.128853

Jonathon Tanks , Tatsuya Akagawa , Kenji Tamura , Yoshihiro Nemoto , Kimiyoshi Naito , Yujiro Watanabe , Thi Thi Nge , Tatsuhiko Yamada

{"title":"Enhancing the thermo-oxidative stability of polyamide 6 by scalable melt-blending with PEG-grafted glycol lignin","authors":"Jonathon Tanks , Tatsuya Akagawa , Kenji Tamura , Yoshihiro Nemoto , Kimiyoshi Naito , Yujiro Watanabe , Thi Thi Nge , Tatsuhiko Yamada","doi":"10.1016/j.polymer.2025.128853","DOIUrl":"10.1016/j.polymer.2025.128853","url":null,"abstract":"<div><div>Thermo-oxidative degradation of polyamide 6 (PA6) is a critical problem for automotive or electrical components that are exposed to elevated temperatures. Conventional stabilizers are often toxic and leach out over time, and while natural additives such as lignin are promising alternatives, they tend to have low miscibility with polymers. In this study, blends of polyamide 6 (PA6) and PEG-grafted glycol lignin (GL) were prepared by melt-extrusion and their thermo-oxidative stability was evaluated. GL blends had mechanical and thermal properties similar to neat PA6, but DSC, XRD, and IR analyses indicated that lignin affects the crystal structure by promoting the formation of <em>α</em>-phase. The antioxidant effect of lignin in suppressing degradation was confirmed by isothermal gravimetric analysis. Accelerated aging between 120 and 180 °C resulted in drastically reduced mechanical properties in neat PA6, but the blends with 5–10 wt% GL showed almost no change up to 168 h and master curves were constructed using the time-temperature superposition principle. XRD analysis revealed that lignin regulates aging-induced crystallization and furthermore favors the transition to <em>α</em>-phase in air. These results demonstrate that GL can be used to improve the thermal stability of PA6 for longer service life and can be beneficial for end-of-life mechanical recycling as well as manufacturing processes such as annealing.</div></div>","PeriodicalId":405,"journal":{"name":"Polymer","volume":"335 ","pages":"Article 128853"},"PeriodicalIF":4.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144701825","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