Polymer Degradation and Stability最新文献

英文中文

Efficient flame retardant with ultrahigh limiting oxygen index obtained by self-assembly impregnation method 利用自组装浸渍法获得具有超高极限氧指数的高效阻燃剂

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111167

Yulian Chen , Lei Miao , Shunxiang Wang , An Wei , Xulan Lu , Yongjin Zou , Cuili Xiang , Songwen Fang , Lixian Sun , Fen Xu

With the increasing demand for environmentally friendly flame retardants for wood, there is a pressing need for efficient and eco-friendly flame retardants. In this study, a novel flame-retardant coating was synthesized using a simple self-assembly impregnation method. Positively charged polyethyleneimine (PEI) was coated on the wood surface via impregnation. Negatively charged ammonium polyphosphate (APP) and montmorillonite (MMT/K10) composites were attached to the PEI surface. Finally, copper sulfate (CuSO₄)-sodium alginate (SA) was encapsulated on the wood surface as a protective layer. Analysis of the cone calorimetry data showed that the self-assembled treated wood (SCAKP-W) suppressed the heat release and mass loss appreciably. It was found that the peak heat release rate (pHRR) of untreated wood was 275.1 kW/m² and the total heat release (THR) was 17.2 MJ/m², whereas the flame retardant-treated wood (SCAKP-W) had a pHRR of 179.4 kW/m² and a THR of 13.0 MJ/m², a considerable reduction of 34.8 % and 24.5 %, respectively. In the thermogravimetry (TG) test, the SCAKP-W had a high residual carbon (34.5 %) at 800 °C. Importantly, the SCAKP-W achieved a UL-94 V-0 rating and ultrahigh limiting oxygen index (LOI) of 57.3 %. These results indicated that the highly efficient flame retardants obtained by a simple impregnation self-assembly method can be adapted to the environment and have great potential for application as surface flame retardants.

{"title":"Efficient flame retardant with ultrahigh limiting oxygen index obtained by self-assembly impregnation method","authors":"Yulian Chen , Lei Miao , Shunxiang Wang , An Wei , Xulan Lu , Yongjin Zou , Cuili Xiang , Songwen Fang , Lixian Sun , Fen Xu","doi":"10.1016/j.polymdegradstab.2024.111167","DOIUrl":"10.1016/j.polymdegradstab.2024.111167","url":null,"abstract":"<div><div>With the increasing demand for environmentally friendly flame retardants for wood, there is a pressing need for efficient and eco-friendly flame retardants. In this study, a novel flame-retardant coating was synthesized using a simple self-assembly impregnation method. Positively charged polyethyleneimine (PEI) was coated on the wood surface via impregnation. Negatively charged ammonium polyphosphate (APP) and montmorillonite (MMT/K10) composites were attached to the PEI surface. Finally, copper sulfate (CuSO<sub>4</sub>)-sodium alginate (SA) was encapsulated on the wood surface as a protective layer. Analysis of the cone calorimetry data showed that the self-assembled treated wood (SCAKP-W) suppressed the heat release and mass loss appreciably. It was found that the peak heat release rate (pHRR) of untreated wood was 275.1 kW/m<sup>2</sup> and the total heat release (THR) was 17.2 MJ/m<sup>2</sup>, whereas the flame retardant-treated wood (SCAKP-W) had a pHRR of 179.4 kW/m<sup>2</sup> and a THR of 13.0 MJ/m<sup>2</sup>, a considerable reduction of 34.8 % and 24.5 %, respectively. In the thermogravimetry (TG) test, the SCAKP-W had a high residual carbon (34.5 %) at 800 °C. Importantly, the SCAKP-W achieved a UL-94 V-0 rating and ultrahigh limiting oxygen index (LOI) of 57.3 %. These results indicated that the highly efficient flame retardants obtained by a simple impregnation self-assembly method can be adapted to the environment and have great potential for application as surface flame retardants.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111167"},"PeriodicalIF":6.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183393","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 and thermo-oxidative accelerated aging of fluorosilicone rubber

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111150

Leticia Pires , Alice Corfa , Vincent Ladmiral , Sylvain Caillol , Mohamed Dekar , Christophe Beauvais , Sébastien Roland , Emmanuel Richaud

The thermal and thermo-oxidative accelerated aging of commercial fluorosilicone rubber (FSR) has been investigated at 200, 220, and 250 °C under air and nitrogen with a focus on macromolecular changes during aging, specifically crosslinking and network scission development. Under nitrogen, chain scission is the primary macromolecular change, evidenced by an increased soluble fraction, higher swelling ratio in ethyl acetate, and decreased stiffness, characterized by tensile test data. In an oxidative environment, degradation behavior varied with temperature. At 200 °C and 250 °C, crosslinking dominated, while at 220 °C, scission and crosslinking contributed nearly equally. Under all conditions, the soluble fraction increased over time. Analyses of this fraction using ²⁹Si NMR and GPC revealed mechanistic explanations for the scission process under air that have been summarized. The proposed chemical mechanisms offer a comprehensive understanding of the degradation pathways of FSR at high temperatures under oxidative conditions.

{"title":"Thermal and thermo-oxidative accelerated aging of fluorosilicone rubber","authors":"Leticia Pires , Alice Corfa , Vincent Ladmiral , Sylvain Caillol , Mohamed Dekar , Christophe Beauvais , Sébastien Roland , Emmanuel Richaud","doi":"10.1016/j.polymdegradstab.2024.111150","DOIUrl":"10.1016/j.polymdegradstab.2024.111150","url":null,"abstract":"<div><div>The thermal and thermo-oxidative accelerated aging of commercial fluorosilicone rubber (FSR) has been investigated at 200, 220, and 250 °C under air and nitrogen with a focus on macromolecular changes during aging, specifically crosslinking and network scission development. Under nitrogen, chain scission is the primary macromolecular change, evidenced by an increased soluble fraction, higher swelling ratio in ethyl acetate, and decreased stiffness, characterized by tensile test data. In an oxidative environment, degradation behavior varied with temperature. At 200 °C and 250 °C, crosslinking dominated, while at 220 °C, scission and crosslinking contributed nearly equally. Under all conditions, the soluble fraction increased over time. Analyses of this fraction using <sup>29</sup>Si NMR and GPC revealed mechanistic explanations for the scission process under air that have been summarized. The proposed chemical mechanisms offer a comprehensive understanding of the degradation pathways of FSR at high temperatures under oxidative conditions.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111150"},"PeriodicalIF":6.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An efficient hydrophobic modification strategy for enhancing collagen stability: Effect of lauric acidic N-hydroxysulfosuccinimide ester on the structure and properties of fish collagen

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111127

Cong Bai , Hao Jiang , Minggao Deng , Qingtian Gong , Peiyu Li , Wentao Liu

The hydrophobic modifications of collagen have emerged as effective approaches to endow collagen-based materials with enhanced structural stability and advanced functions, but the existing hydrophobic modification strategies are relatively inefficient and environmentally unfriendly due to the use of large quantities of organic solvents. It is highly appealing to develop a greener and more efficient strategy to prepare hydrophobically modified collagens (HMCs). Herein, the ester of N-hydroxysulfosuccinimide activated lauric acid (NHSS-LA) was prepared as a promising alternative hydrophobic modifier, which could be efficiently used in aqueous solutions for enhancing the structure and properties of HMCs and hydrophobically modified collagen fiber membranes (HMCFMs). The performance of HMCs and HMCFMs could be tuned through adjusting the dosages of NHSS-LA. Besides maintaining the triple helical structure and cytocompatibility of HMCs, the hydrophobic modification could improve the thermal stability of HMCs owing to the enhancement of hydrophobic associations between collagen molecules, which was closely related to collagen concentrations and modification rates. Furthermore, the water resistance, thermal stability, and enzymatic degradation stability of HMCFMs were significantly improved. This work provides an efficient strategy for modifying fish collagen and fabricating high-performance collagen-based materials.

{"title":"An efficient hydrophobic modification strategy for enhancing collagen stability: Effect of lauric acidic N-hydroxysulfosuccinimide ester on the structure and properties of fish collagen","authors":"Cong Bai , Hao Jiang , Minggao Deng , Qingtian Gong , Peiyu Li , Wentao Liu","doi":"10.1016/j.polymdegradstab.2024.111127","DOIUrl":"10.1016/j.polymdegradstab.2024.111127","url":null,"abstract":"<div><div>The hydrophobic modifications of collagen have emerged as effective approaches to endow collagen-based materials with enhanced structural stability and advanced functions, but the existing hydrophobic modification strategies are relatively inefficient and environmentally unfriendly due to the use of large quantities of organic solvents. It is highly appealing to develop a greener and more efficient strategy to prepare hydrophobically modified collagens (HMCs). Herein, the ester of <em>N</em>-hydroxysulfosuccinimide activated lauric acid (NHSS-LA) was prepared as a promising alternative hydrophobic modifier, which could be efficiently used in aqueous solutions for enhancing the structure and properties of HMCs and hydrophobically modified collagen fiber membranes (HMCFMs). The performance of HMCs and HMCFMs could be tuned through adjusting the dosages of NHSS-LA. Besides maintaining the triple helical structure and cytocompatibility of HMCs, the hydrophobic modification could improve the thermal stability of HMCs owing to the enhancement of hydrophobic associations between collagen molecules, which was closely related to collagen concentrations and modification rates. Furthermore, the water resistance, thermal stability, and enzymatic degradation stability of HMCFMs were significantly improved. This work provides an efficient strategy for modifying fish collagen and fabricating high-performance collagen-based materials.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111127"},"PeriodicalIF":6.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181542","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

Designing silicon-containing nanotube architectures to impart epoxy resin high-efficient flame retardancy

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111129

Xinming Ye , Yifan Zhang , Qianru Guo , Fan Yang , Yunlan Liu , Jiankun Bai , Tong Liu , Xinyi Jing , Fei Xiao , Fengchao Li , Wensheng Wang , Jie Li , Yingchun Li

Nanomaterials are prone to agglomeration in polymer substrates due to their van der Waals forces. The best way to get rid of this interaction via modifying their surfaces to make them “rough”. Herein, the target product CNT-POSS(Li) was designed and fabricated through wrapping lithium-containing hepta-phenyl polyhedral oligomeric silsesquioxane (Li-pH-POSS) nan oparticles on the surface of carboxylated multi-walled carbon nanotubes (MWCNT-COOH). Incorporating one-dimensional nano-morphology of CNT-POSS(Li) into epoxy resin (EP) could effectively solve the puzzle that POSS molecules were affected to dispersed in micron or submicron spherical particles in EP. Additionally, CNT-POSS(Li) could enhance the thermal conductivity and stability of EP. The inclusion of just 2 wt% CNT-POSS(Li) apparently promote the limiting oxygen index (LOI) value from 24.0 % of EP to 29.2 %. Moreover, enormously reducing the peak of heat release rate (p-HRR), smoke production rate (p-SPR), CO production rate (p-COP) by 49.7 %, 56.2 % and 63.2 %, respectively. Therefore, the successful preparation of CNT-POSS(Li) and its application in EP are expected to pave the way for the development of environmentally friendly organic-inorganic hybrid composite flame retardants with ultralow addition and excellent smoke suppression.

{"title":"Designing silicon-containing nanotube architectures to impart epoxy resin high-efficient flame retardancy","authors":"Xinming Ye , Yifan Zhang , Qianru Guo , Fan Yang , Yunlan Liu , Jiankun Bai , Tong Liu , Xinyi Jing , Fei Xiao , Fengchao Li , Wensheng Wang , Jie Li , Yingchun Li","doi":"10.1016/j.polymdegradstab.2024.111129","DOIUrl":"10.1016/j.polymdegradstab.2024.111129","url":null,"abstract":"<div><div>Nanomaterials are prone to agglomeration in polymer substrates due to their van der Waals forces. The best way to get rid of this interaction via modifying their surfaces to make them “rough”. Herein, the target product CNT-POSS(Li) was designed and fabricated through wrapping lithium-containing hepta-phenyl polyhedral oligomeric silsesquioxane (Li-pH-POSS) nan oparticles on the surface of carboxylated multi-walled carbon nanotubes (MWCNT-COOH). Incorporating one-dimensional nano-morphology of CNT-POSS(Li) into epoxy resin (EP) could effectively solve the puzzle that POSS molecules were affected to dispersed in micron or submicron spherical particles in EP. Additionally, CNT-POSS(Li) could enhance the thermal conductivity and stability of EP. The inclusion of just 2 wt% CNT-POSS(Li) apparently promote the limiting oxygen index (LOI) value from 24.0 % of EP to 29.2 %. Moreover, enormously reducing the peak of heat release rate (p-HRR), smoke production rate (p-SPR), CO production rate (p-COP) by 49.7 %, 56.2 % and 63.2 %, respectively. Therefore, the successful preparation of CNT-POSS(Li) and its application in EP are expected to pave the way for the development of environmentally friendly organic-inorganic hybrid composite flame retardants with ultralow addition and excellent smoke suppression.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111129"},"PeriodicalIF":6.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181543","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 of multifunctional Sb2MoO6 nanoflakes for boosting the fire safety and mechanical strength of ABS resin 合成多功能 Sb2MoO6 纳米片，提高 ABS 树脂的防火安全性和机械强度

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111135

Weimei Li , Siqi Huo , Guobo Huang , Wei Chen , Tianle Wang , Pingan Song

To reduce the fire hazard of acrylonitrile butadiene-styrene (ABS), the Sb₂MoO₆ (AM) nanosheets were successfully prepared by a simple hydrothermal method using SbCl₃ and NaMoO₄·2H₂O as Sb and Mo sources, respectively. At different loading levels (0–10 wt%), the Sb₂MoO₆ nanoflakes can be uniformly dispersed in the ABS matrix. Compared with pure ABS, the tensile strength of ABS/AM10 composite with 10 wt% of AM increased by 13%, indicative of the reinforcement effect of AM. Moreover, the introduction of AM did not reduce the initial decomposition temperature of ABS composites, but significantly increased the residue at 600 °C, demonstrating the improved carbonization. AM effectively improved the fire safety of ABS, and 5 and 10 wt% of it decreased the peak heat release rate (PHRR) of ABS/AM5 and ABS/AM10 by 19.7% and 32.9%, respectively. The peak smoke production rate (PSPR) of ABS/AM10 was reduced by 32.4% relative to that of ABS. The improved fire safety of ABS/AM composites was mainly attributed to the physical barrier effect of Sb₂MoO₆ nanosheets. Therefore, this work proposes a feasible approach for the preparation of fire-retardant and strong ABS composites based on metal-oxide nanomaterials.

为了降低丙烯腈-丁二烯-苯乙烯（ABS）的火灾危险性，研究人员分别以 SbCl3 和 NaMoO4-2H2O 为 Sb 和 Mo 源，通过简单的水热法成功制备了 Sb2MoO6（AM）纳米片。在不同的负载水平（0-10 wt%）下，Sb2MoO6 纳米片都能均匀地分散在 ABS 基体中。与纯 ABS 相比，含有 10 wt% AM 的 ABS/AM10 复合材料的拉伸强度提高了 13%，这表明 AM 具有增强作用。此外，AM 的引入并没有降低 ABS 复合材料的初始分解温度，但却显著提高了 600 °C 时的残余物，这表明了碳化效果的改善。AM有效提高了ABS的防火安全性，5 wt%和10 wt%的AM使ABS/AM5和ABS/AM10的峰值热释放率（PRR）分别降低了19.7%和32.9%。与 ABS 相比，ABS/AM10 的峰值产烟率 (PSPR) 降低了 32.4%。ABS/AM 复合材料防火安全性的提高主要归功于 Sb2MoO6 纳米片的物理阻隔效应。因此，本研究提出了一种基于金属氧化物纳米材料制备阻燃性强的 ABS 复合材料的可行方法。

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引用次数: 0

Accelerated weathering of EPON-IPD thermosets reinforced with carbon black 用碳黑增强的 EPON-IPD 热固性塑料的加速老化

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111143

Kubiat George , Dilip Depan , Ahmed Khattab , William M. Chirdon

This study elucidates the role of two carbon black nanofillers (V9A32 and M900) in mitigating the cyclic impact of UV and condensation on thermosetting shape memory polymer capable of high enthalpy storage of shape memory composed of EPON 826 (bisphenol A) and isophorone diamine. Samples were subjected to cyclic UV and condensation for 100, 300, 600, and 1000 h. The chemical, thermal, and morphological properties were examined. FTIR spectroscopy showed that samples prepared with V9A32 exhibited the highest chemical stability at 1000 h of exposure. Attenuated total reflectance Fourier-transform infrared microspectroscopy (µATR-FTIR) mapping was applied to visually track the surface degradation of the composites. µATR-FTIR mapping showed that carbonyl formation increases with exposure, and carbonyl preferentially forms around microcracks and inclusions. Differential scanning calorimetry results showed that the combined effect of UV and condensation leads to chain scission and plasticization, resulting in decreased glass transition temperatures. Morphological examination showed the formation of chalklike particles during the UV cycle that are washed off in the condensation cycle, resulting in weight loss with time. The results comprehensively show that carbon black improves the weathering of these epoxies.

{"title":"Accelerated weathering of EPON-IPD thermosets reinforced with carbon black","authors":"Kubiat George , Dilip Depan , Ahmed Khattab , William M. Chirdon","doi":"10.1016/j.polymdegradstab.2024.111143","DOIUrl":"10.1016/j.polymdegradstab.2024.111143","url":null,"abstract":"<div><div>This study elucidates the role of two carbon black nanofillers (V9A32 and M900) in mitigating the cyclic impact of UV and condensation on thermosetting shape memory polymer capable of high enthalpy storage of shape memory composed of EPON 826 (bisphenol A) and isophorone diamine. Samples were subjected to cyclic UV and condensation for 100, 300, 600, and 1000 h. The chemical, thermal, and morphological properties were examined. FTIR spectroscopy showed that samples prepared with V9A32 exhibited the highest chemical stability at 1000 h of exposure. Attenuated total reflectance Fourier-transform infrared microspectroscopy (µATR-FTIR) mapping was applied to visually track the surface degradation of the composites. µATR-FTIR mapping showed that carbonyl formation increases with exposure, and carbonyl preferentially forms around microcracks and inclusions. Differential scanning calorimetry results showed that the combined effect of UV and condensation leads to chain scission and plasticization, resulting in decreased glass transition temperatures. Morphological examination showed the formation of chalklike particles during the UV cycle that are washed off in the condensation cycle, resulting in weight loss with time. The results comprehensively show that carbon black improves the weathering of these epoxies.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"232 ","pages":"Article 111143"},"PeriodicalIF":6.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143181551","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

Degradation of high-density polyethylene (HDPE) exposed to chlorine dioxide-containing water: The effect of co-monomer and crystalline structure

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111154

Hamidreza Ghadami Karder, Gholamreza Pircheraghi, Ali Rezaei Ghare Baghlar

Throughout the world, polyethylene (PE) pipes are widely used for the distribution of drinking water. As a result of exposure to drinking water containing ClO₂, practical experience has demonstrated that the lifetime of PE pipes can be significantly reduced, and PE pipes in water distribution systems may prematurely fail due to chemical degradation. In this research, the effect of co-monomer type and distribution upon the stability of PE pipes against water-containing ClO₂ has been explored. For this purpose, three pipe grades of polyethylene resins were analyzed, two of which were copolymerized by 1-butene (J-100 and AK-80 samples) and one of which was copolymerized by 1-hexene (AS-80 sample). At first, Samples were aged at 60 °C for 5 weeks in aging solutions containing 10 ppm of ClO₂ disinfectant in DI water. A correlation was found between the changes in physiochemical properties of the samples and their resistance against ClO₂. The crystalline phases of a polymer are impervious to harsh chemicals and plays a role as barriers against ClO₂ molecules. Therefore, the higher crystalline a polymer is, the slower the kinetic of degradation against ClO₂ will be. Moreover, the strong chain entanglement in amorphous phase, suppress the crack growth and enhance the resistance of the pipe against chemical degradation. Consequently, AS-80 resin, which has 1-hexene co-monomers and the uniform distribution of comonomers, exhibits higher stability against ClO_2, as a result of its higher crystallinity and strong chain interaction in amorphous region, and it is preferable in drinking water-containing ClO₂ pipe systems.

在世界各地，聚乙烯（PE）管材被广泛用于饮用水的输送。实际经验表明，由于暴露于含有 ClO2 的饮用水中，聚乙烯管材的使用寿命会大大缩短，输水系统中的聚乙烯管材可能会因化学降解而过早失效。在这项研究中，我们探讨了共聚单体的类型和分布对聚乙烯管材在含有 ClO2 的水中的稳定性的影响。为此，我们分析了三种管材等级的聚乙烯树脂，其中两种是 1-丁烯共聚物（J-100 和 AK-80 样品），一种是 1-己烯共聚物（AS-80 样品）。首先，将样品在 60 °C、含有 10 ppm ClO2 消毒剂的去离子水老化溶液中老化 5 周。结果发现，样品理化性质的变化与其对 ClO2 的耐受性之间存在相关性。聚合物的结晶相不受苛刻化学物质的影响，可作为抵御 ClO2 分子的屏障。因此，聚合物的结晶度越高，抗 ClO2 降解的动力学速度就越慢。此外，无定形相中的强链缠结可抑制裂纹生长，增强管道的抗化学降解能力。因此，含有 1-己烯共聚单体且共聚单体分布均匀的 AS-80 树脂由于结晶度较高，且在无定形区具有较强的链相互作用，因此对 ClO2 具有较高的稳定性，在含 ClO2 的饮用水管道系统中较为理想。

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引用次数: 0

A high-performance flame retardant liquid synthesized on the basis of DOPO hydrolysis products avoids the defects of DOPO 以 DOPO 水解产物为基础合成的高性能阻燃液避免了 DOPO 的缺陷

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111116

Peifeng Liu , Xiang Wang , Xingwu Jiang , Jinzheng Huang , Zhenzhen Dong , Shicheng Miao , Siqi Huo

It was first proposed to use 2-(2-hydroxyphenyl) phenyl phosphonic acid (HPPA), which is hydrolysis product of DOPO, has a structure more similar to EP, to replace DOPO in the preparation of flame retardant, and finally synthesized a highly efficient liquid flame retardant DP based on HPPA, the theoretical phosphorus content of DP is up to 17.5wt%, so EP can achieve excellent flame retardant/inhibit combustion effect with a small amount addition of DP. For example, the LOI of EP/DP_6.0 is increased to 41.2 % and reaches the V-0 rate of UL-94, the PHRR and THR are reduced by 52.4 % and 45.2 % respectively, in addition, the addition of DP in small quantities does not destroy the overall performance of EP, maintains and improves the excellent mechanical and thermal properties of epoxy resin as a whole, and DP has excellent curing promoting effects, meeting the processing and use requirement of high performance EP. It is better than DOPO overall and has good application prospects.

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引用次数: 0

Investigation of microplastics from granulated virgin and UV aged samples in artificial digestion system

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111157

Zhenggui Wu , Yanan Li , Hongmei Chen , Xinyi Dong , Qingfei Duan , Xudong Hao , Long Yu

The environmental concerns of microplastics (MPs) have attracted increasing attention due to their potential harm to human health. However, most of the MPs used in previous studies are from virgin materials through artificial granulation, as it is almost impossible to collect the natural MPs from nature and accurately identify their sources or ages. It is anticipated that the MPs after UV aging possess some major distinct characteristics similar as aged in nature, including variations in molecular weight, molecular weight distribution, surface chemicals. This study systematically investigated both virgin and UV aged samples derived from the most prevalent sources, including polyethylene (PE), polypropylene (PP), poly(ethylene terephthalate) (PET), polystyrene (PS), and poly(vinyl chloride) (PVC), focusing on the effects of the artificial digestion system on the MPs. Additionally, the study evaluated the impact of these MPs on health by examining their effects on probiotics within the digestive system. The results demonstrate that both the effect of digestion treatment MPs and the impact of MPs on intestinal microbiota are significantly different between virgin and aged MPs. While digestion processes were ineffective in degrading virgin MPs, primarily due to their chemical inertness, the surface changes in MPs were more pronounced after UV aging, though they remained largely unaffected by digestion. The surface chemical changes were significant during aging but not during digestion. On the other hand, certain MPs, particularly PVC, may disrupt the balance of intestinal microbiota, especially from aged samples.

由于微塑料（MPs）对人类健康的潜在危害，其环境问题已引起越来越多的关注。然而，以往研究中使用的大多数微塑料都来自人工造粒的原始材料，因为几乎不可能从自然界中收集天然微塑料并准确确定其来源或年龄。预计经过紫外线老化后的 MPs 具有与自然界中老化的 MPs 相似的一些主要特征，包括分子量、分子量分布和表面化学成分的变化。本研究系统地研究了来自聚乙烯（PE）、聚丙烯（PP）、聚对苯二甲酸乙二醇酯（PET）、聚苯乙烯（PS）和聚氯乙烯（PVC）等最常见来源的原始样品和紫外线老化样品，重点研究了人工消化系统对 MPs 的影响。此外，研究还通过考察这些多孔材料对消化系统内益生菌的影响，评估了它们对健康的影响。结果表明，消化处理 MPs 的效果以及 MPs 对肠道微生物群的影响在原生 MPs 和老化 MPs 之间存在显著差异。消化过程无法有效降解原生 MPs，这主要是由于它们的化学惰性，而紫外线老化后，MPs 的表面变化更加明显，尽管它们基本上不受消化的影响。表面化学变化在老化过程中明显，但在消化过程中并不明显。另一方面，某些多孔质材料，尤其是聚氯乙烯，可能会破坏肠道微生物群的平衡，特别是来自老化样本的多孔质材料。

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引用次数: 0

Giovanni Camino (1941 - 2024)

IF 6.3 2区化学 Q1 POLYMER SCIENCE

Polymer Degradation and Stability

Pub Date : 2025-02-01 DOI: 10.1016/j.polymdegradstab.2024.111104

Jenny Alongi , Serge Bourbigot , Sabyasachi Gaan

引用次数: 0

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