Polymer Degradation and Stability最新文献_第7页

On the resistance of PEKK to degradation during multiple recycling cycles for additive manufacturing 增材制造中PEKK在多次循环中的抗降解性能研究

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.polymdegradstab.2026.111951

F. Malekpour , M. Hojjati

{"title":"On the resistance of PEKK to degradation during multiple recycling cycles for additive manufacturing","authors":"F. Malekpour , M. Hojjati","doi":"10.1016/j.polymdegradstab.2026.111951","DOIUrl":"10.1016/j.polymdegradstab.2026.111951","url":null,"abstract":"<div><div>The recyclability of high-performance poly(ether ketone) (PEKK) is critical for sustainable additive manufacturing and future in-space resource utilization. This study systematically evaluates the thermal, mechanical, and chemical stability of PEKK subjected to multiple recycling loops to elucidate potential degradation mechanisms. Thermogravimetric analysis revealed negligible (<1%) mass loss after 5 h of isothermal exposure below 450 °C, confirming the polymer’s excellent thermal resistance under extrusion and printing conditions. Cyclic differential scanning calorimetry (DSC) demonstrated stable melting and cold-crystallization behavior across six thermal cycles, indicating preserved crystallization kinetics. Tensile testing showed that the amorphous strength remained within 83–91 MPa across all cycles, while annealed samples maintained strengths of 102–116 MPa. Flexural strength similarly remained consistent, ranging from 112 to 127 MPa (amorphous) and 147–160 MPa (annealed), and dynamic mechanical analysis (DMA) results indicated minimal changes in viscoelastic properties. Together, these mechanical and thermomechanical analyses confirm that PEKK retains its structural integrity after three complete recycling sequences involving shredding, pulverization, extrusion, and reprinting. Fourier transform infrared spectroscopy detected no new carbonyl or hydroxyl bands, excluding oxidative chain scission, while X-ray fluorescence (XRF) revealed only trace (<0.5 wt%) metallic contamination. Scanning electron microscopy (SEM) of fracture surfaces further confirmed well-fused interlayer morphology and minimal porosity evolution. Collectively, these results demonstrate that PEKK maintains its molecular and microstructural integrity during repeated thermal–mechanical cycles, highlighting its exceptional thermal-oxidative stability and its suitability for circular, high-performance, and extended-lifetime polymer applications.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111951"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035632","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

Unveiling the role of localized secondary crystallization in poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) aging and its effective reversal via annealing 揭示了局部二次结晶在聚（3-羟基丁酸-co-3-羟基己酸）时效过程中的作用及其退火过程的有效逆转

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-20 DOI: 10.1016/j.polymdegradstab.2026.111950

Pengwu Xu , Yongchun Mo , Jiale Liu , Weijun Yang , Yunsheng Xu , Deyu Niu , Piming Ma

{"title":"Unveiling the role of localized secondary crystallization in poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) aging and its effective reversal via annealing","authors":"Pengwu Xu , Yongchun Mo , Jiale Liu , Weijun Yang , Yunsheng Xu , Deyu Niu , Piming Ma","doi":"10.1016/j.polymdegradstab.2026.111950","DOIUrl":"10.1016/j.polymdegradstab.2026.111950","url":null,"abstract":"<div><div>Polyhydroxyalkanoates (PHAs) represent promising biodegradable and biocompatible materials for packaging and biomedical applications, yet their practical implementation is hindered by mechanical deterioration during storage. This study elucidates the aging mechanism of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBH) through systematic investigation of its room-temperature structural evolution. We demonstrate that localized secondary crystallization in amorphous regions, while minimally increasing overall crystallinity (<1%), fundamentally limits chain mobility by elevating the rigid amorphous fraction and glass transition temperature (<em>T</em><sub>g</sub>), ultimately inducing embrittlement. Crucially, we provide the first direct evidence of this structural ordering through decreased small-angle X-ray scattering invariant (<em>Q</em>) values, confirming low-density secondary crystal formation. Remarkably, annealing above <em>T</em><sub>g</sub> effectively reverses aging by eliminating secondary crystals while promoting lamellar thickening and amorphous region homogenization. The consequent narrowing of long-period distribution facilitates uniform stress transfer, enabling simultaneous recovery of strength and toughness: elongation at break recovers from 2.9% to 10.3% alongside tensile strength improvement from 21.9 MPa to 37.8 MPa. These findings establish both a fundamental understanding of PHBH aging and a practical recovery strategy, advancing its potential for sustainable applications.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111950"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146073696","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 temperature performance of polyimide under accelerated thermal aging: linking chemical modifications to electrical properties 加速热老化下聚酰亚胺的高温性能：化学改性与电性能的联系

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-11 DOI: 10.1016/j.polymdegradstab.2026.111939

Jizhu Jin, Davide Fabiani, Simone Vincenzo Suraci

{"title":"High temperature performance of polyimide under accelerated thermal aging: linking chemical modifications to electrical properties","authors":"Jizhu Jin, Davide Fabiani, Simone Vincenzo Suraci","doi":"10.1016/j.polymdegradstab.2026.111939","DOIUrl":"10.1016/j.polymdegradstab.2026.111939","url":null,"abstract":"<div><div>Polyimide (PI) films are widely employed as high-temperature insulation in aerospace and electrical systems, where long-term reliability strongly depends on their thermo-oxidative stability. To evaluate their aging behavior, PMDA-ODA PI films were thermally aged in air at 280°C up to 60 days. Materials were tested by nondestructive techniques: Field Emission Scanning Electron Microscope (FE-SEM), Fourier Transform Infra‐Red (FTIR) (using both ATR and transmission modes), dielectric spectroscopy, DC conductivity and thermally stimulated depolarization current (TSDC) measurements. The results reveal that the material remains stable during the first 10 days with limited oxidation. From 10 to 40 days, FTIR shows that oxidation gradually extends from the surface into the bulk, increasing the amount of carbonyl dipoles. This leads to stronger dipolar polarization, while microstructural rearrangements caused by chain scission enhance interfacial polarization and conductivity. In the later stage, both interfacial polarization and conductivity reach a stable plateau. DC conductivity and TSDC measurements jointly revealed a two-stage trap evolution: a pronounced reduction of activation energy and trap depth up to 30 days, followed by a slower stabilization phase. These findings deepen the understanding of polyimide aging and support the development of more reliable high-temperature insulation.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111939"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975012","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

Ionic liquid functionalized h-BN enhanced polyurethane power battery sealants 离子液体功能化h-BN增强聚氨酯动力电池密封胶

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-15 DOI: 10.1016/j.polymdegradstab.2026.111944

Xiongzhuang Gao, Xingyuan Ma, Xinyuan Xue, Lu Lin

{"title":"Ionic liquid functionalized h-BN enhanced polyurethane power battery sealants","authors":"Xiongzhuang Gao, Xingyuan Ma, Xinyuan Xue, Lu Lin","doi":"10.1016/j.polymdegradstab.2026.111944","DOIUrl":"10.1016/j.polymdegradstab.2026.111944","url":null,"abstract":"<div><div>With the continuous development of battery technology for new energy vehicles (NEVs), the comprehensive performance requirements for power battery sealants are growing increasingly demanding. This study proposes an innovative strategy for preparing high-performance polyurethane power battery sealants (PUSs) by introducing ionic liquid functionalized boron nitride nanosheets (IL-fhBNNS) as a multifunctional filler. [BMIM]PF<sub>6</sub> was used to exfoliate and functionalize h-BN via heating and stirring method, successfully yielding IL-fhBNNS with an average lateral size of 1.59 μm and a thickness of 3.77 nm. Based on polyurethane prepolymer (PUP) and IL-fhBNNS, a series of PUSs samples were successfully synthesized via the prepolymer method combined with casting molding method. The effects of the addition of IL-fhBNNS on the thermal conductivity (TC), flame retardancy, mechanical properties, adhesion and solvent resistance of sealants were investigated. Based on the comprehensive experimental results, the PUS-4 demonstrated optimal comprehensive properties. Thanks to the dense three-dimensional heat conduction network formed by IL-fhBNNS in the PU matrix, the TC of PUS-4 reached 2.701 W m<sup>-1</sup> K<sup>-1</sup>, representing an increase of 963.39 % over pure PU. Meanwhile, PUS-4 exhibited excellent thermal stability and flame retardancy, significantly reducing the PHRR (265.69 kW/m<sup>2</sup>) and THR (59.09 MJ/m<sup>2</sup>) by 44.19 % and 35.70 %, respectively, and reaching the flame retardant rating of V-0 compared with pure PU. Besides, PUS-4 exhibited excellent mechanical properties, with stress and strain reaching 43.98 MPa and 550.16 %, respectively. PUS-4 also showed satisfactory adhesive performance solvent resistance. The lap shear force of PUS-4 on steel substrates reached 3382.56 N. Therefore, PUSs demonstrate great application potential in addressing the challenges of thermal management and sealing in power batteries.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111944"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035625","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

Enhanced dispersion stability of gold nanoparticles with injectable thermoresponsive poly(l-lactide-co-ε-caprolactone)-b-poly(ethylene glycol)-b-poly(l-lactide-co-ε-caprolactone) hydrogels 热响应型聚（l-丙交酯-co-ε-己内酯）-b-聚乙二醇-b-聚（l-丙交酯-co-ε-己内酯）水凝胶增强金纳米颗粒的分散稳定性

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.polymdegradstab.2026.111933

Jiahui Dong, Yu-I Hsu, Hiroshi Uyama

{"title":"Enhanced dispersion stability of gold nanoparticles with injectable thermoresponsive poly(l-lactide-co-ε-caprolactone)-b-poly(ethylene glycol)-b-poly(l-lactide-co-ε-caprolactone) hydrogels","authors":"Jiahui Dong, Yu-I Hsu, Hiroshi Uyama","doi":"10.1016/j.polymdegradstab.2026.111933","DOIUrl":"10.1016/j.polymdegradstab.2026.111933","url":null,"abstract":"<div><div>Amphiphilic block copolymers are widely used to construct thermoresponsive micellar systems with injectable sol-gel transition behavior, making them promising candidates for biomedical applications. In this study, poly(l-lactide-co-ε-caprolactone)-b-poly(ethylene glycol)-b-poly(l-lactide-co-ε-caprolactone) (PLCL-PEG-PLCL) triblock copolymers were employed to fabricate micelles and micelle-AuNP hybrids. AuNPs were incorporated through two distinct strategies, direct aqueous mixing and THF-induced micellization, resulting in different spatial distributions. Spectroscopic and rheological analyses revealed that corona-associated AuNPs hindered micelle association and delayed gelation, whereas core-encapsulated AuNPs preserved the intrinsic thermo-responsive behavior. In addition, micelle formation significantly enhanced the stability of AuNPs under freezing, lyophilization, and heating conditions. These results demonstrate that controlling AuNPs localization within PLCL-PEG-PLCL micelles offers an effective strategy to tune optical response, rheology, and stability, providing a versatile platform for photothermally active injectable hydrogels.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111933"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035626","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

Molecularly engineered PBS/FDCA copolymers: Balancing strength, degradability, and osteoinductivity for sustainable bone scaffolds 分子工程PBS/FDCA共聚物：平衡强度，可降解性和可持续骨支架的骨诱导性

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-05 DOI: 10.1016/j.polymdegradstab.2026.111922

Zheng Li , Zhixuan Li , Sichao Yu , Xuan Yao , Guosheng Wang , Dayin Sun , Jie Zhang , Na Wang

{"title":"Molecularly engineered PBS/FDCA copolymers: Balancing strength, degradability, and osteoinductivity for sustainable bone scaffolds","authors":"Zheng Li , Zhixuan Li , Sichao Yu , Xuan Yao , Guosheng Wang , Dayin Sun , Jie Zhang , Na Wang","doi":"10.1016/j.polymdegradstab.2026.111922","DOIUrl":"10.1016/j.polymdegradstab.2026.111922","url":null,"abstract":"<div><div>Polybutylene succinate (PBS) is a biodegradable polyester with good biocompatibility and processability, yet its relatively low mechanical strength, slow degradation, and limited bioactivity hinder its use in osteogenic scaffolds. To address these limitations, and inspired by the nacreous “brick-and-mortar” structure of marine shells, this study incorporated bio-based 2,5-furandicarboxylic acid (FDCA) into the PBS backbone via a stepwise, temperature-controlled polycondensation, generating a series of PBSF copolymers. Experimental results showed that moderate FDCA incorporation at 15 mol% (PBSF15) markedly improved mechanical performance, with tensile strength and elongation at break increasing by 30.63% and 467.59%, respectively, compared with pure PBS. Notably, PBSF15 exhibited the optimal compressive performance, achieving a compressive strength of 115.41 MPa and a compressive modulus of 283.97 MPa. It also exhibited the highest flexural modulus (586.48 MPa) and flexural strength (33.28 MPa), while maintaining good processability and hydrophilicity. Moreover, enzymatic degradation tests revealed accelerated mass loss (≈ 89.89% within 12 days), and in vitro studies using MC3T3-E1 cells confirmed excellent cytocompatibility, sustained proliferation, and significant upregulation of osteogenic markers, including Col I and TGF-β. Collectively, this work presents a sustainable molecular design strategy that simultaneously enhances mechanical performance, accelerates degradation, and promotes osteoinductive activity, providing a promising platform for bone defect repair and regenerative medicine.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111922"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941235","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

Effect of isocyanate structure on bio-based poly(diethylene furanoate)-b- poly(caprolactone) thermoplastic polyurethanes 异氰酸酯结构对生物基聚呋喃二酯-b-聚己内酯热塑性聚氨酯的影响

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.polymdegradstab.2026.111929

Judit Rebeka Molnár, Yu-I Hsu, Hiroshi Uyama

{"title":"Effect of isocyanate structure on bio-based poly(diethylene furanoate)-b- poly(caprolactone) thermoplastic polyurethanes","authors":"Judit Rebeka Molnár, Yu-I Hsu, Hiroshi Uyama","doi":"10.1016/j.polymdegradstab.2026.111929","DOIUrl":"10.1016/j.polymdegradstab.2026.111929","url":null,"abstract":"<div><div>Thermoplastic polyurethane elastomers combine the durability and toughness of thermoplastics with the elasticity of rubber. Since most conventional polyurethanes are fossil-based, the development of sustainable alternatives is essential. While the composition and phase separation have been explored extensively, only a few reports have systematically examined the effect of isocyanate type on polyurethanes. In this work, bio-based poly(diethylene furanoate)-b-poly(caprolactone) (PDEF-b-PCL) copolymers were synthesized, where diisocyanates with three different structures were used as a chain-extender: methylene diphenyl diisocyanate (MDI), hexamethylene diisocyanate (HDI), and dicyclohexylmethane 4,4′-diisocyanate (H12MDI) to systematically evaluate how their structure affects the structure–property relationships of the resulting copolymers. DSC and DMA confirmed that the copolymers exhibited dual-phase transitions, indicating that they consisted of a crystalline phase formed by PCL and an amorphous phase comprising PCL and PDEF. Structural analysis revealed that crystallinity was governed by PCL content and was highest in HDI-based samples, which was the most mobile among the isocyanates. For PDEF, due to its amorphous structure, the tensile properties were mainly influenced by the structure of the isocyanate. The copolymers exhibited enhanced elongation at break compared to the homopolymers, reaching up to 2372 ± 340%, attributed to strain hardening of the PCL crystalline domains and the amorphous PDEF segments acting as physical crosslinks that distributed stress. Some of the copolymers achieved superior toughness up to 233 MJ/m<sup>3</sup>, compared to both PCL and PDEF homopolymers. The incorporation of PDEF significantly improved thermal stability with higher T<sub>d,max</sub> values, and all copolymers showed higher T<sub>d,5%</sub> compared to their homopolymer counterparts.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111929"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974645","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

Oxygen vacancy–driven redox mechanisms for enhanced thermo-oxidative stability of silicone rubber with Fe2O3, CeO2, and CeZrO2 Fe2O3、CeO2和CeZrO2增强硅橡胶热氧化稳定性的氧空位驱动氧化还原机制

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.polymdegradstab.2026.111927

Hyeon Woo Jeong, Hye In Kang, Jaewon Lee, Sang Eun Shim

{"title":"Oxygen vacancy–driven redox mechanisms for enhanced thermo-oxidative stability of silicone rubber with Fe2O3, CeO2, and CeZrO2","authors":"Hyeon Woo Jeong, Hye In Kang, Jaewon Lee, Sang Eun Shim","doi":"10.1016/j.polymdegradstab.2026.111927","DOIUrl":"10.1016/j.polymdegradstab.2026.111927","url":null,"abstract":"<div><div>The thermal degradation of silicone rubber in high-temperature oxidative environments remains a critical challenge, yet the mechanistic role of oxygen vacancy engineering in cerium-based stabilizers has not been systematically explored. This study demonstrates that CeO₂ and CeZrO₂ (HRA-01) achieve superior stabilization through oxygen vacancy–mediated Ce³⁺/Ce⁴⁺ redox cycling that couples radical scavenging with dynamic oxygen buffering, with zirconium incorporation further enhancing oxygen vacancy density and mobility. Consequently, under harsh aging at 250 °C for 200 h, whereas pristine PDMS exhibited catastrophic toughness loss (∼98.5 %) and Fe₂O₃ composites offered only partial mitigation (81–98.5 % loss), CeO₂-filled and HRA-01 composites retained markedly higher toughness, limiting losses to 42–54 % and 40–50 %, respectively. Thermogravimetric analysis showed nearly constant residues for CeO₂ and HRA-01 (31–32 %), in sharp contrast to the substantial increases in pristine and Fe₂O₃ systems. Beyond performance metrics, we elucidate the oxygen-vacancy-mediated stabilization mechanism: vacancy-enabled Ce³⁺/Ce⁴⁺ redox cycling couples rapid radical scavenging with dynamic oxygen buffering, additionally, Zr incorporation increases vacancy density and mobility to suppress thermo-oxidative chain scission and uncontrolled crosslinking. These findings establish CeZrO₂ as a next-generation stabilizer that will contribute to enhanced durability and extended service lifetimes of silicone rubbers in demanding industrial applications.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111927"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974647","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

Tough and biodegradable lactate (LA)-based polyester (LAHB) hyperproduced by reinforcing LA-polymerizing enzyme gene expression 通过增强乳酸聚合酶基因表达而产生的坚韧可生物降解乳酸基聚酯（LAHB）

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2025-12-31 DOI: 10.1016/j.polymdegradstab.2025.111910

Sangho Koh , Furutate Sho , Yusuke Imai , Shunsuke Sato , Seiichi Taguchi

{"title":"Tough and biodegradable lactate (LA)-based polyester (LAHB) hyperproduced by reinforcing LA-polymerizing enzyme gene expression","authors":"Sangho Koh , Furutate Sho , Yusuke Imai , Shunsuke Sato , Seiichi Taguchi","doi":"10.1016/j.polymdegradstab.2025.111910","DOIUrl":"10.1016/j.polymdegradstab.2025.111910","url":null,"abstract":"<div><div>Poly[(<span>d</span>-lactate)-<em>co</em>-(<em>R</em>)-3-hydroxybutyrate] (LAHB) is a microbial copolyester that exhibits excellent environmental biodegradability. LAHB also functions as a multifunctional modifier that markedly improves both the mechanical properties and biodegradability of non-biodegradable poly(<span>l</span>-lactide) (PLLA). The lactate (LA) fraction is a key determinant governing the material properties of LAHB as well as its <span>d</span>-LA-<span>l</span>-LA-mediated interactions with PLLA. Then, in this study, we attempted to reinforce the gene expression of lactate-polymerizing enzyme (LPE) in the recombinant strain of <em>Cupriavidus necator</em> that was plausibly to be a rate-limiting factor for LA-unit incorporation. Expectedly, with the improved LA fraction, high-cell-density cultivation of the engineered strain GSXd147 synergistically achieved 97 g L⁻¹ dry cell weight and 70 wt% LAHB within 48 h from glucose—the highest LAHB titer and productivity reported to date. It should be noted that the resulting LA-enriched LAHB retained a high-molecular weight (15 mol% LA, <em>M</em><sub>w</sub> 30 × 10<sup>4</sup>) and consequently exhibited a well-balanced combination of strength and elongation, yielding overall toughness comparable to the petroleum-based polyethylene.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111910"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145974651","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

Boosting the flame retardancy of vinyl ester resins via a DE@DMMP hybrid: Reducing migration and improving fire performance 通过DE@DMMP混合物提高乙烯基酯树脂的阻燃性：减少迁移和提高防火性能

IF 7.4 2区化学

Polymer Degradation and Stability Pub Date : 2026-04-01 Epub Date: 2026-01-27 DOI: 10.1016/j.polymdegradstab.2026.111963

Jinxin Xie , Akhmetova Marzhan , Zhanturina Nurgul , Yanbei Hou , Bekeshev Amirbek , Weizhao Hu , Xin Wang , Yuan Hu , Fukai Chu

{"title":"Boosting the flame retardancy of vinyl ester resins via a DE@DMMP hybrid: Reducing migration and improving fire performance","authors":"Jinxin Xie , Akhmetova Marzhan , Zhanturina Nurgul , Yanbei Hou , Bekeshev Amirbek , Weizhao Hu , Xin Wang , Yuan Hu , Fukai Chu","doi":"10.1016/j.polymdegradstab.2026.111963","DOIUrl":"10.1016/j.polymdegradstab.2026.111963","url":null,"abstract":"<div><div>Vinyl ester resins (VER) require flame-retardant modification for safe application, but conventional additives face limitations. To overcome the high volatility and migration tendency of the effective liquid phosphorus flame retardant dimethyl methylphosphonate (DMMP), this study develops a novel composite by confining DMMP within the micro-nano porous structure of diatomite (DE) to form a DE@DMMP hybrid. This hybrid was incorporated into VER to create flame-retardant composites. Successful DMMP adsorption onto DE was confirmed through FTIR and SEM analysis. Compared with the physically mixed DE/DMMP system, the VER composite containing 25 wt% DE@DMMP exhibited better thermal stability and more char residues. It achieved superior flame retardancy, with a limiting oxygen index of 26% and a UL-94 V-0 rating. Cone calorimetry tests revealed a remarkable 50.54% reduction in the peak heat release rate and a 58.30% decrease in total heat release versus pure VER, alongside suppressed total smoke production. The enhanced performance is attributed to a synergistic phosphorus-silicon effect. The immobilized DMMP provides efficient gas-phase radical quenching, whereas the silica framework of DE promotes the formation of a compact, thermally stable char layer enriched with Si-O-P crosslinking structures, as evidenced by XPS analysis. This work presents an effective strategy to mitigate additive migration and develop high-performance, halogen-free, flame-retardant VER with balanced fire safety.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"246 ","pages":"Article 111963"},"PeriodicalIF":7.4,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074292","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