Polymer Degradation and Stability最新文献_第3页

Urea-catalyzed green aqueous degradation of anhydride-cured epoxy 尿素催化酸酐固化环氧树脂的绿色水降解

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI: 10.1016/j.polymdegradstab.2026.111995

Nan Hu , Chizhou Wang , Peng Zhao , Liye Yuan , Shaodi Wu , Ning Zhang , Xianglin Hou , Tiansheng Deng

引用次数: 0

Minimum D-lactate sequence lengths enabling stereocomplex formation between random copolymers of D-(R)-lactate and D-(R)-3-hydroxybutyrate (LAHBs) and poly(lactate) D-(R)-乳酸和D-(R)-3-羟基丁酸酯（LAHBs）与聚乳酸无规共聚物之间能形成立体络合物的最小D-乳酸序列长度

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-01-29 DOI: 10.1016/j.polymdegradstab.2026.111976

Yusuke Imai , Shinji Tanaka , Sangho Koh , Shinji Tanaka , Seiichi Taguchi

{"title":"Minimum D-lactate sequence lengths enabling stereocomplex formation between random copolymers of D-(R)-lactate and D-(R)-3-hydroxybutyrate (LAHBs) and poly(lactate)","authors":"Yusuke Imai , Shinji Tanaka , Sangho Koh , Shinji Tanaka , Seiichi Taguchi","doi":"10.1016/j.polymdegradstab.2026.111976","DOIUrl":"10.1016/j.polymdegradstab.2026.111976","url":null,"abstract":"<div><div>In this study, we discovered the formation of a stereocomplex (SC) between the biosynthesized random copolymer poly[(D-(<em>R</em>)-lactate)-<em>ran</em>-(D-(<em>R</em>)-3-hydroxybutyrate)] (LAHB) and L-monomer-rich poly(lactate) (PLA). Wide-angle X-ray diffraction (WAXD) measurements revealed that LAHBs containing 42 and 59 mol% LA formed SCs with PLAs, whereas LAHB with 28 mol% LA did not. WAXD measurements conducted at different temperatures, along with differential scanning calorimetry (DSC) analyses, revealed that the crystalline structure formed between LAHB and PLA exhibits higher thermal stability than PLA homocrystals. This characteristic is consistent with typical SC behavior, thereby supporting the conclusion that LAHBs successfully formed SCs with PLAs. Monomer sequence distribution analysis indicated that D-LA sequences longer than seven units were rare in the LAHBs. These results suggest that D-LA sequences of six or fewer units can facilitate SC formation, likely through the cooperative contribution of multiple short D-LA sequences distributed along the LAHB chains.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111976"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171911","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

Mass transfer driven electro-oxidation of polyethylene terephthalate microplastics using a rotating parallel electrode system 用旋转平行电极系统传质驱动聚对苯二甲酸乙二醇酯微塑料的电氧化

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-08 DOI: 10.1016/j.polymdegradstab.2026.111990

Gokul Gangadharan P, Anand Bharti, Aniruddha Deb, Abhijit Mondal

{"title":"Mass transfer driven electro-oxidation of polyethylene terephthalate microplastics using a rotating parallel electrode system","authors":"Gokul Gangadharan P, Anand Bharti, Aniruddha Deb, Abhijit Mondal","doi":"10.1016/j.polymdegradstab.2026.111990","DOIUrl":"10.1016/j.polymdegradstab.2026.111990","url":null,"abstract":"<div><div>Microplastic pollution poses a serious environmental threat, requiring efficient and sustainable removal strategies. This study reports a novel rotating 4-pair vertical parallel electrode system for rapid and high-efficiency removal of polyethylene terephthalate (PET) microplastics (MPs) via electro-oxidation (EO). The reactor achieved 90 ± 3 % removal within 3 h at 100 rpm and 2 A, employing a boron-doped diamond (BDD) anode and titanium (Ti) cathode in 0.03 M Na<sub>2</sub>SO<sub>4</sub> at neutral pH (6–7). Controlled electrode rotation enhanced mass transfer, improving contact between PET particles and oxidizing species while reducing bubble accumulation at the anode to maintain continuous efficiency. FTIR, FESEM and EDS analyses confirmed significant polymer breakdown and structural transformation of PET MPs, while gas chromatography verified CO₂ as the final oxidation product. The effects of initial PET concentration, applied current, and rotation speed on removal efficiency were systematically investigated. Transport parameters, including mass transfer coefficient, diffusion layer thickness, and limiting current density, were analyzed under both static and rotating conditions. Overall, the findings demonstrate that the rotating electrode system provides efficient and energy-effective PET MPs removal, highlighting its potential for MP remediation.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111990"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171476","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

Thermal stability enhancement of polydicyclopentadiene through phenolic-functionalized comonomer incorporation 通过掺入酚功能化共聚单体增强多环戊二烯的热稳定性

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-09 DOI: 10.1016/j.polymdegradstab.2026.111992

Chengyang Ban , Wu Li , Dawei Zhang , Jiawei Chen , Menghe Xu , Guifu Si

引用次数: 0

Fire-retardant aerogels from seaweed-derived residue reinforced with recycled carbon fibers for multifunctional applications 用再生碳纤维增强的海藻渣阻燃气凝胶，用于多功能应用

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-01-30 DOI: 10.1016/j.polymdegradstab.2026.111957

Jimena de la Vega , Antonio Vázquez-López , Ignacio Collado , Silvia G. Prolongo , De-Yi Wang

{"title":"Fire-retardant aerogels from seaweed-derived residue reinforced with recycled carbon fibers for multifunctional applications","authors":"Jimena de la Vega , Antonio Vázquez-López , Ignacio Collado , Silvia G. Prolongo , De-Yi Wang","doi":"10.1016/j.polymdegradstab.2026.111957","DOIUrl":"10.1016/j.polymdegradstab.2026.111957","url":null,"abstract":"<div><div>As emerging materials, aerogels have increasingly attracted more interest as prospective candidates for thermal insulation applications due to their potential low thermal conductivity. Recently, their application in areas such as electromagnetic interference shielding, Joule heating, and sensing has gained interest. Designing efficient, lightweight, and multifunctional materials from renewable, recycled sources is challenging. This study presents a route to obtain aerogels from biowaste and recycled reinforcements. The aerogels were based on κ-carrageenan and seaweed-derived waste from the agar-agar industry, including phytic-acid-functionalized seaweed waste, with additional incorporation of carbon black and recycled milled and recycled carbon fibers in milled and chopped forms. The optimized aerogels exhibited instant fire self-extinguishing behavior, showing no ignition in cone calorimeter tests and a remarkable limiting oxygen index (LOI) of 68%, which is attributed to the formation of a stable κ-carrageenan network and the synergistic action of phytic acid, carbon black, and recycled carbon fibers in promoting char formation and flame inhibition. In addition, the incorporation of carbon black and recycled carbon fibers promoted aerogels with high electrical conductivity (3–0.8 S/m) and significant EMI shielding efficiency (27.9 dB). They also generated repeatable high temperatures (∼180 °C) with low voltages (>2.5 V) and electrical power inputs (∼6.78 W) via Joule heating. Additionally, their piezoresistive performance under deformation was analysed, showing their potential use as sensing devices.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111957"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171912","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

Insights into molecular design of intrinsically non-combustible polybenzoxazines: Effect of amine structure on coumarin-based di-oxazine 本质上不可燃的聚苯并恶嗪的分子设计：胺结构对香豆素基二恶嗪的影响

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.polymdegradstab.2026.111989

Maria Laura Salum , Pablo Froimowicz , Chris Scott , Hatsuo Ishida

{"title":"Insights into molecular design of intrinsically non-combustible polybenzoxazines: Effect of amine structure on coumarin-based di-oxazine","authors":"Maria Laura Salum , Pablo Froimowicz , Chris Scott , Hatsuo Ishida","doi":"10.1016/j.polymdegradstab.2026.111989","DOIUrl":"10.1016/j.polymdegradstab.2026.111989","url":null,"abstract":"<div><div>A novel set of three different coumarin-based di-oxazine benzoxazine monomers is designed and efficiently synthesized using 5,7-dihydroxy-4-methylcoumarin and formalin as the di-phenol and formaldehyde sources, while varying the amine compounds. The three different amines studied in this work are aniline, benzylamine, and furfurylamine. All syntheses are carried out at room temperature and using ethanol as the solvent. The benzoxazine resins are fully characterized in terms of their chemical structures as well as thermal properties and polymerization behavior. Upon polymerization, the resulting thermosets have also been characterized in terms of their thermal properties and flammability. This work provides a deep understanding of the role played by the amine moieties when they are a constitutive part of the benzoxazine monomers <strong>57MCOU-fa</strong> shows a safe processing window (∼ 21 °C), and <strong>poly(57MCOU-fa)</strong> is intrinsically nonignitable (HRC = 12 J g<sup>-1</sup> K<sup>-1</sup>).</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111989"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171477","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

PCA-DFT integrated analysis of the high-frequency degradation mechanisms in polyimide insulation films 聚酰亚胺绝缘膜高频降解机理的PCA-DFT综合分析

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-07 DOI: 10.1016/j.polymdegradstab.2026.111991

Shengrui Zhou , Li Zhang , Guan Wang , Bilal Iqbal Ayubi , Rakhmonov Ikromjon Usmonovich , Junpeng Ji

{"title":"PCA-DFT integrated analysis of the high-frequency degradation mechanisms in polyimide insulation films","authors":"Shengrui Zhou , Li Zhang , Guan Wang , Bilal Iqbal Ayubi , Rakhmonov Ikromjon Usmonovich , Junpeng Ji","doi":"10.1016/j.polymdegradstab.2026.111991","DOIUrl":"10.1016/j.polymdegradstab.2026.111991","url":null,"abstract":"<div><div>Under high-frequency electrical stress, polyimide (PI) films are prone to insulation degradation, which limits their long-term reliability in high-frequency power electronic equipment. In this work, a plate-plate electrode-based high-frequency partial discharge test platform was established, and discharge pulses were reliably extracted using a wavelet-threshold denoising method to systematically investigate the dielectric properties and discharge evolution of PI films under different frequency conditions. On this basis, principal component analysis (PCA) was employed to reduce the dimensionality of multi-parameter discharge features and elucidate their statistical correlations, while density functional theory (DFT) calculations were further performed to reveal the underlying physical origins at the molecular scale. The results show that with increasing electric-field frequency, the partial discharge inception voltage, the discharge count per cycle, and the negative-to-positive half-cycle discharge ratio all exhibit an overall decreasing trend. PCA identifies dominant factors associated with discharge intensity and polarity bias, whose orthogonal decomposition reveals the coupling and separation characteristics of these mechanisms under high-frequency conditions. DFT calculations further indicate that the applied electric field induces significant charge redistribution, leading to enhanced molecular dipole moments, reduced chemical bond stability, and a narrowed frontier orbital energy gap, thereby providing a molecular-level explanation for the reduced discharge threshold and accelerated degradation under high-frequency electrical stress. The PCA-DFT combined analysis framework established in this study offers a new methodological perspective for cross-scale investigations of high-frequency insulation degradation mechanisms.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111991"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171484","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

Green and thermostable bio-based flame retardant system: A new strategy for preparing flame-retardant polyvinyl alcohol materials via melt processing 绿色耐热生物基阻燃体系：熔体法制备阻燃聚乙烯醇材料的新策略

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-01-21 DOI: 10.1016/j.polymdegradstab.2026.111953

Ziyi Xuan , Wenzong Xu , Zhongqiong Qin , Jiayan Zhang , Julan Liu

{"title":"Green and thermostable bio-based flame retardant system: A new strategy for preparing flame-retardant polyvinyl alcohol materials via melt processing","authors":"Ziyi Xuan , Wenzong Xu , Zhongqiong Qin , Jiayan Zhang , Julan Liu","doi":"10.1016/j.polymdegradstab.2026.111953","DOIUrl":"10.1016/j.polymdegradstab.2026.111953","url":null,"abstract":"<div><div>In recent years, with the deepening of sustainable development concepts, polyvinyl alcohol (PVA) has garnered widespread attention as a biodegradable, non-toxic material. However, its inherent flammability significantly limits its practical applications. Developing flame-retardant PVA materials suitable for melt processing while maintaining their tensile properties remains a major challenge for practical PVA applications. This study synthesized a novel, highly thermally stable, eco-friendly bio-based flame retardant, CADCM, which was incorporated into the PVA matrix via melt processing. Results indicated that with the addition of just 12.5 wt% CADCM, the PVA composite achieved a limiting oxygen index (LOI) value of 30.3 % and a vertical combustion test UL-94 rating of V-0. Reductions of 66.1 % in the peak heat release rate (pHRR) and 31.7 % in total heat release (THR) were observed compared to PVA0. This demonstrates that the synthesized flame retardant CADCM is suitable for preparing PVA composites with excellent flame retardancy via melt processing. Regarding mechanical properties, the composite exhibited improvements of 27.4 % in tensile strength and 285.2 % in elastic modulus. In terms of processing performance, the processing melting temperature of the PVA composite with CADCM addition remained suitable for processing requirements, maintaining good processability. The bio-based melt-processable flame-retardant PVA composite prepared in this study provides a feasible pathway and new insights for further expanding the scope of practical application fields of PVA materials.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111953"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146090790","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 and properties of biodegradable poly(butylene succinate-co-1,4-cyclohexylene succinate) 可生物降解聚琥珀酸丁烯-co-1,4-琥珀酸环己烯的合成及性能研究

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.polymdegradstab.2026.111961

Toyokazu Tsutsuba , Masaru Sakata , Junko Torii , Yuya Tachibana , Ken-ichi Kasuya

{"title":"Synthesis and properties of biodegradable poly(butylene succinate-co-1,4-cyclohexylene succinate)","authors":"Toyokazu Tsutsuba , Masaru Sakata , Junko Torii , Yuya Tachibana , Ken-ichi Kasuya","doi":"10.1016/j.polymdegradstab.2026.111961","DOIUrl":"10.1016/j.polymdegradstab.2026.111961","url":null,"abstract":"<div><div>Driven by increasing environmental concerns, biodegradable polymers have received widespread attention. Poly(butylene succinate) (PBSu) is a commercially available biodegradable polymer and copolymerization with other monomers is an effective strategy to control its properties. The disubstituted cyclohexane ring, being biodegradable, can be employed as a comonomer to improve the thermal and mechanical properties. In this study, we synthesized poly(butylene succinate-<em>co</em>-cyclohexylene succinate) (PBCS) from succinic acid, 1,4-cyclohexanediol, and 1,4-butanediol to investigate how incorporation of cyclohexane units into the PBSu main chain modulates material properties. The PBCSs were characterized by <sup>1</sup>H and <sup>13</sup>C NMR spectrometry, size-exclusion chromatography, thermogravimetric analysis, differential scanning calorimetry, and wide-angle X-ray diffraction. Their mechanical properties were examined by tensile strength testing of melt-pressed films. The results showed that introducing cyclohexane units reduced crystallinity and alleviated the brittleness of PBSu. Enzymatic hydrolyzability, evaluated by a clear zone formation method, suggests that all PBCSs were susceptible to hydrolysis by various extracellular enzymes. Environmental biodegradability, assessed via biochemical oxygen demand testing, demonstrated that incorporating the cyclohexane unit can enhance the biodegradability of poly(butylene succinate) for specific copolymer compositions. Copolymerization of 1,4-cyclohexanediol, a rigid alicyclic monomer, significantly improved the thermal properties and provided a versatile method for simultaneously tuning mechanical property and biodegradability.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111961"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171986","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

N/P/S synergistic design of epoxy composites towards flame retardancy, Acid/Alkali resistance and comprehensive performance 环氧复合材料阻燃、耐酸碱及综合性能的N/P/S协同设计

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-05-01 Epub Date: 2026-02-04 DOI: 10.1016/j.polymdegradstab.2026.111983

Guoping Zhu , Yu Huang , Zhennan Wang , Zongmin Zhu , Fei Xiao

{"title":"N/P/S synergistic design of epoxy composites towards flame retardancy, Acid/Alkali resistance and comprehensive performance","authors":"Guoping Zhu , Yu Huang , Zhennan Wang , Zongmin Zhu , Fei Xiao","doi":"10.1016/j.polymdegradstab.2026.111983","DOIUrl":"10.1016/j.polymdegradstab.2026.111983","url":null,"abstract":"<div><div>Driven by escalating demands for high-performance materials in aerospace and electronic packaging sectors, multifunctional epoxy resins (EP) integrating efficient flame retardancy, low smoke emission, superior mechanical properties and low dielectric characteristics have become a research frontier. This study synthesized an ion bonded flame retardant (DPAT) featuring N/P/S synergy via a one-pot reaction and incorporated it into the epoxy matrix to achieve synergistic property optimization. Results demonstrated that merely 3 wt.% DPAT substantially enhanced comprehensive performance: the limiting oxygen index (LOI) increased to 30.1% with attainment of UL-94 V-0 rating; during combustion, peak heat release rate (pHRR) decreased by 37.8% and total smoke production (TSP) reduced by 17.5%. Concurrently, mechanical properties improved synergistically, with the tensile strength increased by 27.5% and impact strength by 41.9%. Notably, the composite maintained high visible-light transmittance while achieving further reduced dielectric constant. Additionally, EP-3DPAT exhibited dramatically diminished corrosion current density (I<sub>corr</sub>) and elevated polarization resistance (R<sub>p</sub>) in acidic/alkaline environments, demonstrating superior chemical corrosion resistance compared to neat EP. This work not only achieved synergistic enhancement of flame retardancy, smoke suppression, mechanical reinforcement, toughness improvement, dielectric reduction, and corrosion resistance, but also established a viable molecular design paradigm for functionalizing high-performance thermosetting resins.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"247 ","pages":"Article 111983"},"PeriodicalIF":7.4,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171916","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