Polymer Degradation and Stability最新文献

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Impact of a deformed state on natural rubber oxidation investigated by double-quantum nuclear magnetic resonance 用双量子核磁共振研究了变形态对天然橡胶氧化的影响
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-23 DOI: 10.1016/j.polymdegradstab.2025.111622
Pierre-Yves Le Gac , Sabrina Taourit , Pierre Pubelier , Clément Robin , Bruno Fayolle
{"title":"Impact of a deformed state on natural rubber oxidation investigated by double-quantum nuclear magnetic resonance","authors":"Pierre-Yves Le Gac ,&nbsp;Sabrina Taourit ,&nbsp;Pierre Pubelier ,&nbsp;Clément Robin ,&nbsp;Bruno Fayolle","doi":"10.1016/j.polymdegradstab.2025.111622","DOIUrl":"10.1016/j.polymdegradstab.2025.111622","url":null,"abstract":"<div><div>This study demonstrates experimentally the influence of a deformation state on the oxidation process in a model of vulcanized natural rubber (NR) without reinforcing fillers. For this demonstration, relaxation tests in air at 100 °C were used to couple the oxidation process to a state of deformation. Network characterizations were carried out with and without deformation at several exposure times in air and nitrogen. In parallel to the classical network characterization by swelling, the evolution of network topology was monitored using a solid-state <sup>1</sup>H homonuclear dipolar double-quantum (DQ) nuclear magnetic resonance (NMR). In the undeformed state, the evolution of the network using both techniques shows a predominant chain scission process compared with crosslinking. Based on <sup>1</sup>H DQ NMR characterizations, these chain scission and crosslinking processes lead to a broadening of the molar mass distribution of the mechanically active chains, resulting in a heterogeneous network. Although the state of deformation does not influence the evolution of the average molar mass values between crosslinks during oxidation, the deformation state (λ = 2) evidently favors a more heterogeneous network topology through the coupling between orientation anisotropy as well as the crosslinking process.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"242 ","pages":"Article 111622"},"PeriodicalIF":7.4,"publicationDate":"2025-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144922380","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 flame retardant strategy for thermoplastic polyurethanes: Sustainable utilization of oyster shell waste through chitosan extraction combined with phytic acid and Prussian blue 热塑性聚氨酯的绿色阻燃策略:壳聚糖萃取-植酸-普鲁士蓝复合工艺对牡蛎壳废弃物的可持续利用
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-22 DOI: 10.1016/j.polymdegradstab.2025.111621
Biyu Huang , Jirui Qu , Gaoyuan Li , Haopeng Zhang , Yiwei Geng , Lei Liu , Shaofeng Wang , Chuanmei Jiao , Xilei Chen
{"title":"Green flame retardant strategy for thermoplastic polyurethanes: Sustainable utilization of oyster shell waste through chitosan extraction combined with phytic acid and Prussian blue","authors":"Biyu Huang ,&nbsp;Jirui Qu ,&nbsp;Gaoyuan Li ,&nbsp;Haopeng Zhang ,&nbsp;Yiwei Geng ,&nbsp;Lei Liu ,&nbsp;Shaofeng Wang ,&nbsp;Chuanmei Jiao ,&nbsp;Xilei Chen","doi":"10.1016/j.polymdegradstab.2025.111621","DOIUrl":"10.1016/j.polymdegradstab.2025.111621","url":null,"abstract":"<div><div>In this work, we developed a green strategy to extract chitosan (CS) from oyster shell (OS) waste via a ball-milling exfoliation method, then modified with phytic acid (PA) and combined with Prussian blue analog (PBA) nanoparticles to serve as a flame retardant for thermoplastic polyurethane (TPU) composites. The resulting TPU/PBA-CS@PA composites exhibited remarkable improvements in fire safety performance, demonstrating 58.5 % and 43.4 % reductions in peak heat release rate (pHRR) and total smoke production (TSP), respectively, compared to the control TPU. Notably, the composite containing 6 wt% PBA-CS@PA achieved a UL-94 V-0 rating while exhibiting no melt dripping behavior. The flame-retardant mechanism involved PBA-catalyzed formation of a graphitized, thermally stable char layer, while PA and CS synergistically improved char compactness. Hydrogen bonding between additives and the TPU matrix enhanced interfacial adhesion, increasing tensile strength by 31.5 % (30.16 MPa). This work presents a green strategy for converting biowaste into high-performance flame retardants, advancing eco-friendly polymer composites with balanced fire safety and mechanical properties.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111621"},"PeriodicalIF":7.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144904248","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
Fire-retardant and thermally stable chitosan–citric acid biofoam for sustainable building insulation 阻燃和热稳定壳聚糖-柠檬酸生物泡沫可持续建筑保温
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-22 DOI: 10.1016/j.polymdegradstab.2025.111618
Zhongjun Yang , Jiping Jiang , Shuduan Deng , Xinyi Chen , Seng Hua Lee , Wei Chen Lum , Xiaojian Zhou , Guanben Du , Hongyan Wang , Jun Zhang
{"title":"Fire-retardant and thermally stable chitosan–citric acid biofoam for sustainable building insulation","authors":"Zhongjun Yang ,&nbsp;Jiping Jiang ,&nbsp;Shuduan Deng ,&nbsp;Xinyi Chen ,&nbsp;Seng Hua Lee ,&nbsp;Wei Chen Lum ,&nbsp;Xiaojian Zhou ,&nbsp;Guanben Du ,&nbsp;Hongyan Wang ,&nbsp;Jun Zhang","doi":"10.1016/j.polymdegradstab.2025.111618","DOIUrl":"10.1016/j.polymdegradstab.2025.111618","url":null,"abstract":"<div><div>The environmental problems resulting from the widespread use of conventional petroleum-based foams have prompted the pursuit of a sustainable and renewable alternative. Biobased foams based entirely on renewable resources such as chitosan (CS), citric acid (CA), sucrose (S) and phytic acid (PA) have been prepared and denoted as CCSP foam. The cooperative effects of various biobased materials on the mechanical and thermal properties, flame retardancy, and biodegradability of the resultant biofoams have been investigated. The CCSP foam was synthesized by treating CS with CA, followed by crosslinking with S and PA. The performance of the resultant foam was subsequently evaluated. The cooperative effects of the components lead to the formation of biofoams with excellent thermal insulation properties and flame retardancy with a limiting oxygen index (LOI) as high as 87.2 %. In addition, the foams exhibit low peak heat release rate (pHRR), total heat release rate (THR), peak smoke generation rate (pSPR), total smoke release rate (TSP) for combustion and low thermal conductivity, highlighting their potential as safe building materials. Besides being lightweight and biodegradable, the cooperative effects of additives present contribute to the foams exceptional compressive and structural integrity, which are equally significant properties for construction applications. Insights into the formulation of high-performance biofoams derived exclusively from sustainable and renewable materials have been provided.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111618"},"PeriodicalIF":7.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144904247","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
Continuous cultivation of defined mixed bacterial cultures for upcycling polyurethane and polyethylene terephthalate monomers to polyhydroxyalkanoates 连续培养的定义的混合细菌培养升级回收聚氨酯和聚对苯二甲酸酯单体到聚羟基烷酸酯
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-22 DOI: 10.1016/j.polymdegradstab.2025.111605
Karthika Balusamy, Tanja Narančić, Manuel Bruch, William Casey, Michelle Rich, Ciara Lynch, Graham Hughes, Lars M Blank, Nick Wierckx, Kevin O'Connor
{"title":"Continuous cultivation of defined mixed bacterial cultures for upcycling polyurethane and polyethylene terephthalate monomers to polyhydroxyalkanoates","authors":"Karthika Balusamy,&nbsp;Tanja Narančić,&nbsp;Manuel Bruch,&nbsp;William Casey,&nbsp;Michelle Rich,&nbsp;Ciara Lynch,&nbsp;Graham Hughes,&nbsp;Lars M Blank,&nbsp;Nick Wierckx,&nbsp;Kevin O'Connor","doi":"10.1016/j.polymdegradstab.2025.111605","DOIUrl":"10.1016/j.polymdegradstab.2025.111605","url":null,"abstract":"<div><div>Prostate cancer is an androgen-dependent tumor, and androgen deprivation therapy (ADT) is an important treatment modality. Relugolix is the first oral GnRH receptor antagonist, which has been approved for clinical use. However, its oral formulation requires daily administration, leading to poor patient adherence and suboptimal treatment outcomes for long-term users. To address these issues, we developed a long-acting micronized formulation of relugolix long-acting microcrystalline formulation that is administered once every 28 days, and systematically evaluated its pharmacokinetics (PK), pharmacodynamics (PD), and safety profile in male Beagle dogs. In this study, we established a high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method for blood concentration detection, used a highly specific and stable ELISA method to measure serum testosterone levels, and assessed the safety of the drug in male Beagle dogs. The HPLC-MS/MS method showed good linearity (R2=0.9991). The intra-day precision varied between 2.8% and 10.9%, while the inter-day precision ranged from 1.6% to 5.4%. In terms of accuracy, the intra-day values ranged from -7.3% to -3.2%, and the inter-day accuracy ranged from -10.2% to 0.8%. Furthermore, key parameters such as stability, extraction recovery, and matrix effects met the FDA bioanalytical method validation guidelines. Pharmacokinetic studies showed that the AUC and Tmax exhibited significant sustained-release characteristics, and the half-life was notably extended compared to Orgovyx. Pharmacodynamic analysis showed a significant negative correlation between blood drug concentration and testosterone suppression (testosterone levels began to decline after administration, and castration levels were maintained between 504-1008 hours). Safety assessments revealed that although no treatment-related deaths or significant weight changes were observed, some hematological parameters (RBC, HGB increases), liver function indicators (ALT, AST increases), and triglyceride (TG) levels showed statistically significant changes (p&lt;0.05). This suggests potential concerns regarding hemodynamic effects, hepatotoxicity, and lipid metabolism</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"242 ","pages":"Article 111605"},"PeriodicalIF":7.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145004851","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
Correlation of the crystalline structure, moisture content, texture and aging-induced degradation of polyamide 5.10 using wide-angle x-ray scattering analysis 广角x射线散射分析聚酰胺5.10晶体结构、含水量、织构与老化降解的相关性
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-22 DOI: 10.1016/j.polymdegradstab.2025.111620
Celia Katharina Falkenreck , Alexander Liehr , Jan-Christoph Zarges , Hans-Peter Heim , Thomas Niendorf
{"title":"Correlation of the crystalline structure, moisture content, texture and aging-induced degradation of polyamide 5.10 using wide-angle x-ray scattering analysis","authors":"Celia Katharina Falkenreck ,&nbsp;Alexander Liehr ,&nbsp;Jan-Christoph Zarges ,&nbsp;Hans-Peter Heim ,&nbsp;Thomas Niendorf","doi":"10.1016/j.polymdegradstab.2025.111620","DOIUrl":"10.1016/j.polymdegradstab.2025.111620","url":null,"abstract":"<div><div>The present study provides a detailed analysis of the crystalline structure of polyamide 5.10 (PA5.10) and determines the effects of hydrothermal aging on its moisture content, crystallinity, and texture. Using wide-angle X-ray scattering (WAXS), thework presents insights into both the amorphous boundary layer and the semi-crystalline core. A <em>Python</em> script based on <em>Bragg</em>’s law enables precise identification of crystalline details. <em>Gaussian</em> fitting of crystalline peaks further deepened the structural understanding. The effects of experimental parameters on WAXS measurements were examined to identify additional factors influencing PA5.10. Hydrothermal aging led to notable changes, including increased moisture absorption, volume expansion, enhanced crystallinity, and shifts in molecular structure and crystalline morphology. WAXS revealed that moisture-induced scattering reduced intensity, which was reversible upon re-drying. Despite an increase in crystallinity observed by differential scanning calorimetry (DSC), WAXS did not capture a corresponding shift, likely due to the combined effects of residual moisture and annealing processes. Overall, the present study enhances the understanding of crystalline behavior of PA5.10 under hydrothermal exposure and provides a basis for future investigations into its aging processes and structural evolution. These findings contribute to a broader understanding of the long-term degradation mechanisms and stability of bio-based polyamides under hydrothermal and humid conditions. Moreover, the insights gained are relevant for predicting material performance in moisture-sensitive applications and can inform the development of stabilization strategies for hygroscopic polymers.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"242 ","pages":"Article 111620"},"PeriodicalIF":7.4,"publicationDate":"2025-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144989007","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 double-edged sword of flame retardants in building cables: fire suppression vs. arc hazard amplification 阻燃剂在建筑电缆中的双刃剑:灭火vs电弧危害放大
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-21 DOI: 10.1016/j.polymdegradstab.2025.111619
Ying-jie Zhu , Zhen Wei , Yu Du , Ya-Wen Sheng , Peng-rui Man , Yun-Han , Xue-peng Yang , Bai-quan Zhu , Wen-wei Su , Jian Gong , Yun Wang , Huai-bin Wang , Yang Li
{"title":"The double-edged sword of flame retardants in building cables: fire suppression vs. arc hazard amplification","authors":"Ying-jie Zhu ,&nbsp;Zhen Wei ,&nbsp;Yu Du ,&nbsp;Ya-Wen Sheng ,&nbsp;Peng-rui Man ,&nbsp;Yun-Han ,&nbsp;Xue-peng Yang ,&nbsp;Bai-quan Zhu ,&nbsp;Wen-wei Su ,&nbsp;Jian Gong ,&nbsp;Yun Wang ,&nbsp;Huai-bin Wang ,&nbsp;Yang Li","doi":"10.1016/j.polymdegradstab.2025.111619","DOIUrl":"10.1016/j.polymdegradstab.2025.111619","url":null,"abstract":"<div><div>With the rapid development of modern industrial technology, the demand for power in building electrical equipment continues to rise, rendering the existing rated current standards for cables inadequate to meet actual needs. Frequent overcurrent phenomena lead to abnormal temperature rise in cables, which has become the main cause of major electrical fire accidents. To effectively enhance the related fire resistance, flame retardants are added to the insulating materials of cables. In this study, the dual role of flame retardants in PVC-sheathed building cables is investigated, focusing on their fire-suppression capabilities and potential amplification of arc hazards under overcurrent conditions. Through TG-FTIR analysis and cone calorimeter tests, it is revealed that flame retardants effectively improve the fire resistance of insulating materials by delaying thermal degradation, generating HCl earlier to dilute flammable gases, and forming a protective carbon layer. However, by systematically investigating the fault characteristics of flame-retardant (FR) and non-flame-retardant (NFR) PVC-sheathed cables under different overcurrent conditions, combined with real-time oscilloscope monitoring data, two typical types of failure modes of PVC-sheathed cables in electrical fires are identified. In addition, comparing with that observed in NFR PVC-sheathed cables, the increase of the energy of the arc and an extension of the duration of the arc in FR PVC-sheathed cables are also observed for the same failure mode. All these facts can be attributed to the coating effect of metal chlorides and metal oxides, which inadvertently facilitates wires to be closer to each other and intensifies arc formation. This study not only emphasizes the need for a comprehensive evaluation system for the selection of flame retardants, which assesses both FR performance and impact on electrical faults, but also highlights the importance of a multi-layered defense strategy in electrical fire safety, combining FR materials with arc prevention to reduce fire risks in buildings.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111619"},"PeriodicalIF":7.4,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144904246","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
Composting a Sticky Problem: Synthesis and Degradation of Isosorbide-Derived Hot-Melt Adhesive 堆肥的一个棘手问题:异山梨酯衍生热熔胶的合成与降解
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-20 DOI: 10.1016/j.polymdegradstab.2025.111617
Kyeong Mi Kim , Dong Ki Hwang , Huijeong Park , Hyo Jeong Kim , Jeyoung Park , Dongyeop X Oh , Sung Bae Park , Hyeonyeol Jeon , Jun Mo Koo
{"title":"Composting a Sticky Problem: Synthesis and Degradation of Isosorbide-Derived Hot-Melt Adhesive","authors":"Kyeong Mi Kim ,&nbsp;Dong Ki Hwang ,&nbsp;Huijeong Park ,&nbsp;Hyo Jeong Kim ,&nbsp;Jeyoung Park ,&nbsp;Dongyeop X Oh ,&nbsp;Sung Bae Park ,&nbsp;Hyeonyeol Jeon ,&nbsp;Jun Mo Koo","doi":"10.1016/j.polymdegradstab.2025.111617","DOIUrl":"10.1016/j.polymdegradstab.2025.111617","url":null,"abstract":"<div><div>The accumulation of nondegradable plastics in the environment exacerbates the severity of plastic pollution, and adhesives such as hot melts are no exception. In multilayer plastic products, hot-melt layers are inserted between plastic films to provide functionality and adhesion: however, these adhesives reduce the overall degradability of the product and adversely affect the physical and chemical biodegradation process, even if the underlying substrate is biodegradable. Given the wide range of its industrial applications, transitioning from petroleum-based hot-melt adhesive components to biomass-based alternatives that maintain adequate mechanical properties is essential. In this context, we introduce a novel biodegradable hot-melt adhesive system based on poly(1,4-cyclohexanedimethylene-co-isosorbide succinate-co-citrate) (PCISC), a complex polyester derived from isosorbide. This system incorporates biomass-derived monomers and demonstrates a high adhesion of 5.2 MPa, similar to that of conventional hot-melt adhesives. The structure of the PCISC with such a high adhesion is evaluated through rheological analysis, and the transition of the adhesive component upon curing is identified using two-dimensional correlation spectroscopy. The high adhesion is the result of a combination of factors, including the mobility of flexible components (1,4-cyclohexanedimethanol and succinic acid), the formation of a 3D network through crosslinking of rigid components (citric acid), and partial charge interactions between the oxygen-containing moieties in isosorbide and the substrate. Degradation and composting experiments using biodegradable poly(lactic acid) as a substrate demonstrate the potential of the PCISC as a successful alternative to conventional hot-melt adhesives.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111617"},"PeriodicalIF":7.4,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144904510","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
Neutral hydrolysis of post-industrial PET waste: Cetyltrimethylammonium bromide (CTAB)-catalyzed and catalyst-free reactions 工业后PET废弃物的中性水解:十六烷基三甲基溴化铵(CTAB)催化和无催化剂反应
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-20 DOI: 10.1016/j.polymdegradstab.2025.111609
Alireza Bakhshpour , Abbas Rezaee Shirin-Abadi , Michael Enayati
{"title":"Neutral hydrolysis of post-industrial PET waste: Cetyltrimethylammonium bromide (CTAB)-catalyzed and catalyst-free reactions","authors":"Alireza Bakhshpour ,&nbsp;Abbas Rezaee Shirin-Abadi ,&nbsp;Michael Enayati","doi":"10.1016/j.polymdegradstab.2025.111609","DOIUrl":"10.1016/j.polymdegradstab.2025.111609","url":null,"abstract":"<div><div>Polyethylene terephthalate (PET) is one of the most widely used polymers globally, thus generating a significant amount of waste each year. Chemical recycling is an effective method for converting PET waste into its monomeric constituents. In this study, the hydrolysis of a PET waste generated in an industrial production line was investigated. The hydrolysis process was carried out in the presence of cetyltrimethylammonium bromide (CTAB) as a catalyst. The Taguchi L18 design was employed to evaluate the effects of three key parameters: temperature, reaction time, and the CTAB:PET mass ratio. Analysis of variance (ANOVA) was also conducted to assess the statistical significance of these parameters. The results showed that the highest terephthalic acid yield (90.44 %) was achieved at 215 °C, 90 min, and 5.0 wt% catalyst, while a yield of 95.91 % was obtained at 220 °C, 90 min, without a catalyst. Statistical analysis indicated that temperature had the most significant impact on hydrolysis efficiency, followed by reaction time, and catalyst loading. The calculated environmental energy impacts (ξ) for these optimal reactions are 9.6 × 10<sup>3</sup> and 7.5 × 10<sup>3</sup> °C·min, for the 215 and 220 °C, respectively, that are fairly low compared to other neutral hydrolysis reports. To confirm the structural composition and purity of the reaction products, Fourier-transform infrared spectroscopy, nuclear magnetic resonance, X-ray diffraction analysis, and thermogravimetric analysis were performed.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111609"},"PeriodicalIF":7.4,"publicationDate":"2025-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890656","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 MBenes and biomass MOF hybrid flame retardant through electrostatic interaction for enhancing the flame retardancy and smoke suppression performance of epoxy resin 通过静电相互作用制备MBenes和生物质MOF杂化阻燃剂,提高环氧树脂的阻燃抑烟性能
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-19 DOI: 10.1016/j.polymdegradstab.2025.111616
Ge Zhang , Yunhong Jiao , Yuying Yang , Xin Gao , Ye-Tang Pan , Jun Sun , Hongqiang Qu , Jianzhong Xu
{"title":"Preparation of MBenes and biomass MOF hybrid flame retardant through electrostatic interaction for enhancing the flame retardancy and smoke suppression performance of epoxy resin","authors":"Ge Zhang ,&nbsp;Yunhong Jiao ,&nbsp;Yuying Yang ,&nbsp;Xin Gao ,&nbsp;Ye-Tang Pan ,&nbsp;Jun Sun ,&nbsp;Hongqiang Qu ,&nbsp;Jianzhong Xu","doi":"10.1016/j.polymdegradstab.2025.111616","DOIUrl":"10.1016/j.polymdegradstab.2025.111616","url":null,"abstract":"<div><div>MXenes was an emerging two-dimensional layered nanomaterial, but its flame retardancy in epoxy resins remained limited. In this study, a metal-organic framework (MOF) was synthesized from biomass-derived adenine, 3,5-pyrazole-2-carboxylic acid, and Ni²⁺ ions. After modification with hexachlorocyclotriphosphazene, it was combined with MBenes nanosheets through electrostatic interactions to synthesize bio-based organic-inorganic hybrid flame retardants (PMOF@MB), and apply it to EP. Remarkably, incorporating only 1 wt% PMOF@MB reduced the peak heat release rate (PHRR), total heat release (THR), peak CO production (PCOP), and peak CO₂ production (PCO<sub>2</sub>P) of the EP composite by 56 %, 30 %, 62 %, and 62 %, respectively, compared to pure EP. The NiO and NiMoO<sub>4</sub> produced after PMOF@MB combustion catalyzed CO oxidation, formed a protective char layer, suppressed heat and toxic smoke generation, and consequently enhanced the fire resistance of EP. This work provided theoretical support for the preparation of low additive flame retardant and environmentally friendly EP composites.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"241 ","pages":"Article 111616"},"PeriodicalIF":7.4,"publicationDate":"2025-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144890655","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
Research progress on aging test and performance evaluation of marine coatings 船舶涂料老化试验及性能评价研究进展
IF 7.4 2区 化学
Polymer Degradation and Stability Pub Date : 2025-08-19 DOI: 10.1016/j.polymdegradstab.2025.111614
Rongjun E , Hongxia Li , Yu Li , Yu Li
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