Chinese Journal of Polymer Science最新文献

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Influence of Soft Segment Length on the Dielectric Polarization Behavior of Ketal-containing Polyurethane Elastomer 软段长度对含酮聚氨酯弹性体介电极化行为的影响
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-22 DOI: 10.1007/s10118-025-3474-8
Xue Mei, Wan Lu, Jian-Rong Dong, Ke-Heng Pan, Jun-Jie Tan, Hong-Ye Yan, Jun Wu, Yu Zhou, Hong-Xiang Chen
{"title":"Influence of Soft Segment Length on the Dielectric Polarization Behavior of Ketal-containing Polyurethane Elastomer","authors":"Xue Mei,&nbsp;Wan Lu,&nbsp;Jian-Rong Dong,&nbsp;Ke-Heng Pan,&nbsp;Jun-Jie Tan,&nbsp;Hong-Ye Yan,&nbsp;Jun Wu,&nbsp;Yu Zhou,&nbsp;Hong-Xiang Chen","doi":"10.1007/s10118-025-3474-8","DOIUrl":"10.1007/s10118-025-3474-8","url":null,"abstract":"<div><p>Polyurethane elastomers exhibit high dielectric constants owing to their polar groups, and can be used as energy storage capacitors. Energy storage depends not only on the dielectric constant but also on the dielectric loss. However, the relationship between chain structure and dielectric properties is not yet clear. Ketal-containing crosslinked polyurethane elastomers were prepared using cyclic ketal diol as a chain extender. The effect of the soft segment length on the dielectric properties and energy storage was investigated. The cause of the change in the dipolar polarization with the soft segment length was analyzed. As the soft segment length increased, the hard-soft hydrogen bonding decreased, whereas the hard-hard hydrogen bonding increased. Under the action of an electric field, the polar bonds in the ketal-containing polyurethane elastomer overcome the hydrogen bonding between hard-soft segments to produce polarization; meanwhile, they also experience crankshaft motions to generate polarization. The former has a relatively high relaxation activation energy of approximately 10–20 kJ·mol<sup>−1</sup>, resulting in a large dielectric loss. The latter has a relatively low relaxation activation energy, approximately 0.7–1.7 kJ·mol<sup>−1</sup>, leading to low dielectric loss. As a result, the dielectric constant showed a decreasing trend, and the dielectric loss gradually decreased. This study provides a theoretical foundation for improving the dielectric properties of polyurethane elastomers.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"189 - 197"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340760","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
An Inherently Flame-retardant Bio-based Poly(ethylene 2,5-furandicarboxylate) Copolyester with High Impact Toughness and UV Shielding 一种具有高冲击韧性和紫外线屏蔽性能的天然阻燃生物基聚乙烯醇2,5-呋喃二羧酸酯共聚酯
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-22 DOI: 10.1007/s10118-025-3478-4
Qi Jiang, Jia-Yi Li, Han Hu, Jin-Hao Sun, Wei-Hong Cao, Lin-Yi Hu, Dong-Qing Wei, Jing-Gang Wang, Jin Zhu
{"title":"An Inherently Flame-retardant Bio-based Poly(ethylene 2,5-furandicarboxylate) Copolyester with High Impact Toughness and UV Shielding","authors":"Qi Jiang,&nbsp;Jia-Yi Li,&nbsp;Han Hu,&nbsp;Jin-Hao Sun,&nbsp;Wei-Hong Cao,&nbsp;Lin-Yi Hu,&nbsp;Dong-Qing Wei,&nbsp;Jing-Gang Wang,&nbsp;Jin Zhu","doi":"10.1007/s10118-025-3478-4","DOIUrl":"10.1007/s10118-025-3478-4","url":null,"abstract":"<div><p>Bio-based 2,5-furandicarboxylic acid polyesters offer significant promise for reducing energy and environmental crises. However, their intrinsic flammability remains a critical limitation, and conventional flame-retardant strategies often compromise their mechanical properties, hindering their practical applications. Herein, a 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)-based comonomer (DDP) was used to synthesize flame-retardant poly(ethylene furandicarboxylate-<i>co</i>-phosphaphenanthrene) (PEFDn). The covalent integration of DDP confers intrinsic flame retardancy, avoiding the plasticization and migration issues associated with additive-type systems. Upon thermal decomposition, the DOPO-derived moieties release phosphoric acid and radical scavengers, promoting char formation and suppressing flame propagation. Furthermore, density functional theory (DFT) calculations combined with non-covalent interaction (NCI) analysis revealed that DOPO dimer molecules adopt a stable parallel-displaced <i>π–π</i> stacking configuration, potentially facilitating microphase separation and enhancing the energy dissipation capability. PEFD<sub>10</sub> achieves a UL-94 V-0 rating while simultaneously increasing impact toughness from 1.5 kJ/m<sup>2</sup> to 14.7 kJ/m<sup>2</sup>. Importantly, PEFDn maintained acceptable oxygen-barrier properties. PEFD<sub>10</sub> also exhibited high transparency and UV-shielding performance. The combination of intrinsic flame safety, impact-toughness resistance, UV shielding, and an oxygen barrier ensures reliable protection of electrical components and long-term operational stability. The integration of multiple critical properties within a single bio-based material represents a novel approach for enabling sustainable polymer solutions for high-performance electrical applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"30 - 43"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340892","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
Determination of Phenolic Hydroxyl Content in Poly(phenylene oxide) by Differential Ultraviolet Spectrophotometry 差示紫外分光光度法测定聚环氧苯中酚羟基的含量
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-22 DOI: 10.1007/s10118-025-3463-y
Qin-Yu Yan, Shun-Gang Song, Bu-Jie Zhou, Jing Hu, Lian-Fang Feng, Xue-Ping Gu, Cai-Liang Zhang
{"title":"Determination of Phenolic Hydroxyl Content in Poly(phenylene oxide) by Differential Ultraviolet Spectrophotometry","authors":"Qin-Yu Yan,&nbsp;Shun-Gang Song,&nbsp;Bu-Jie Zhou,&nbsp;Jing Hu,&nbsp;Lian-Fang Feng,&nbsp;Xue-Ping Gu,&nbsp;Cai-Liang Zhang","doi":"10.1007/s10118-025-3463-y","DOIUrl":"10.1007/s10118-025-3463-y","url":null,"abstract":"<div><p>Poly(phenylene oxide) (PPO) exhibits excellent dielectric properties, making it an ideal substrate for high-frequency, high-speed copper-clad laminates. The phenolic hydroxyl group at the end of PPO plays a key role in its reactivity. Accurately quantifying the phenolic hydroxyl content in PPO is essential but challenging. In this study, we proposed a method for measuring the phenolic hydroxyl content of PPO using differential UV absorption spectroscopy. In alkaline solutions, the phenolic hydroxyl in PPO completely ionizes to form phenoxide ions, leading to a significant increase in UV absorbance at approximately 250 and 300 nm. Notably, the differential UV absorbance at approximately 300 nm was directly proportional to the phenolic hydroxyl concentration. Using 2,6-dimethylphenol as a standard, a calibration curve was established to relate the phenolic hydroxyl concentration to differential UV absorbance at approximately 300 nm, providing a precise and straightforward method for phenolic hydroxyl quantification in PPO with distinct advantages over conventional techniques.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"79 - 86"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340763","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
Visual pH-responsive Material Based on Bromothymol Blue-immobilized Carboxymethyl Cellulose 基于溴百里酚蓝固定化羧甲基纤维素的视觉ph响应材料
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-22 DOI: 10.1007/s10118-025-3477-5
Shan-Shan Yu, Zhao-Yang Chen, Xiang-Mei Sun, Hai-Tao Pan, Zi-Hao Yang, Ke-Feng Ren, Xiao-Liang Shi, Jian Ji
{"title":"Visual pH-responsive Material Based on Bromothymol Blue-immobilized Carboxymethyl Cellulose","authors":"Shan-Shan Yu,&nbsp;Zhao-Yang Chen,&nbsp;Xiang-Mei Sun,&nbsp;Hai-Tao Pan,&nbsp;Zi-Hao Yang,&nbsp;Ke-Feng Ren,&nbsp;Xiao-Liang Shi,&nbsp;Jian Ji","doi":"10.1007/s10118-025-3477-5","DOIUrl":"10.1007/s10118-025-3477-5","url":null,"abstract":"<div><p>Responsive colorimetric materials exhibit significant potential for application in fields such as smart food packaging and wound monitoring. The functional integration of pH-indicators with material carriers enables breakthrough applications in nontraditional domains. In this study, we developed a novel material covalently grafted with a pH indicator that exhibited naked-eye pH-responsive color shifts. The covalent grafting of pH-responsive bromothymol blue onto carboxymethyl cellulose (CMC) was confirmed using advanced characterization techniques, including Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The pH-sensitive chromophore was covalently immobilized onto the CMC matrix through esterification, thereby establishing firm chemical conjugation. Moreover, a superior color-changing performance was achieved within several minutes in response to different pH values. The reusability and stability of this material offer distinct advantages over single-use pH test strips. pH-responsive colorimetric materials hold promise for efficient, noninvasive monitoring in intelligent packaging (food freshness), medical diagnostics (wound status, infections), biosensing, and environmental applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"13 - 20"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340890","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
Highly Conductive and High-tensile Methacrylated Hyaluronic Acid Hydrogels for Strain Sensing Applications 用于应变传感应用的高导电和高强度甲基丙烯酸透明质酸水凝胶
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-22 DOI: 10.1007/s10118-025-3482-8
Meng Zhang, Xu-Dong Yu
{"title":"Highly Conductive and High-tensile Methacrylated Hyaluronic Acid Hydrogels for Strain Sensing Applications","authors":"Meng Zhang,&nbsp;Xu-Dong Yu","doi":"10.1007/s10118-025-3482-8","DOIUrl":"10.1007/s10118-025-3482-8","url":null,"abstract":"<div><p>Owing to their good biocompatibility, polysaccharide hydrogels have broad application prospects in the field of flexible strain sensors. However, there are still significant challenges in the preparation of polysaccharide hydrogels with good mechanical properties. MCA-LiCl hydrogels were prepared by introducing methacrylated hyaluronic acid (MeHA) into the polymer network in the presence of acrylic acid (AA), acryloyloxyethyltrimethyl ammonium chloride (CATAC), and metal ions. The polymer network not only has a chemically cross-linked network and a tough network structure, but also benefits from a variety of supramolecular interactions, such as hydrogen bonding and coordination covalent bonding, resulting in excellent mechanical properties, with an elongation at break of 1390%, a tensile strength of up to 1200 kPa, a toughness of 9.4546 MJ/m<sup>3</sup>, and adhesive properties towards various substrates. At the same time, the hydrogel has a high conductivity (5.33 mS/cm) and high strain-sensing sensitivity (Gauge factor=2.55). The flexible strain sensor assembled from the prepared MCA-LiCl hydrogel can be used to detect human movements, from micro-expressions (smiles, swallowing) to pulse signals and other physiological activities, as well as large-scale joint movements (wrists, elbows, knees, fingers, <i>etc.</i>), realizing the real-time monitoring of full-scale human movements. The prepared hydrogels have potential applications in wearable devices, electronic skin, and strain-sensor components.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"127 - 139"},"PeriodicalIF":4.0,"publicationDate":"2025-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10118-025-3482-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340762","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
Machine Learning-assisted Discovery of Multifunctional Coordination in Multicomponent Composites 多组分复合材料中多功能协调的机器学习辅助发现
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-18 DOI: 10.1007/s10118-025-3479-3
Zi-Ran Guo, Sen Xue, Lu He, Zi-Long Xie, Tian-Hao Yang, Qiang Fu
{"title":"Machine Learning-assisted Discovery of Multifunctional Coordination in Multicomponent Composites","authors":"Zi-Ran Guo,&nbsp;Sen Xue,&nbsp;Lu He,&nbsp;Zi-Long Xie,&nbsp;Tian-Hao Yang,&nbsp;Qiang Fu","doi":"10.1007/s10118-025-3479-3","DOIUrl":"10.1007/s10118-025-3479-3","url":null,"abstract":"<div><p>The complex interactions and conflicting performance demands in multi-component composites pose significant challenges for achieving balanced multi-property optimization through conventional trial-and-error approaches. Machine learning (ML) offers a promising solution, markedly improving materials discovery efficiency. However, the high dimensionality of feature spaces in such systems has long impeded effective ML-driven feature representation and inverse design. To overcome this, we present an Intelligent Screening System (ISS) framework to accelerate the discovery of optimal formulations balancing four key properties in 15-component PTFE-based copper-clad laminate composites (PTFE-CCLCs). ISS adopts modular descriptors based on the physical information of component volume fractions, thereby simplifying the feature representation. By leveraging the inverse prediction capability of ML models and constructing a performance-driven virtual candidate database, ISS significantly reduced the computational complexity associated with high-dimensional spaces. Experimental validation confirmed that ISS-optimized formulations exhibited superior synergy, notably resolving the trade-off between thermal conductivity and peel strength, and outperform many commercial counterparts. Despite limited data and inherent process variability, ISS achieved an average prediction accuracy of 76.5%, with thermal conductivity predictions exceeding 90%, demonstrating robust reliability. This work provides an innovative, efficient strategy for multifunctional optimization and accelerated discovery in ultra-complex composite systems, highlighting the integration of ML and advanced materials design.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"256 - 267"},"PeriodicalIF":4.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340156","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
Tailoring Dielectric Properties of Polymer Matrix Composites for High-performance Flexible Sensors 高性能柔性传感器用聚合物基复合材料的介电特性研究
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-18 DOI: 10.1007/s10118-025-3470-z
Jun Li, Kit-Ming Ma, Li-Sha Zhang, Xiao-Ming Tao
{"title":"Tailoring Dielectric Properties of Polymer Matrix Composites for High-performance Flexible Sensors","authors":"Jun Li,&nbsp;Kit-Ming Ma,&nbsp;Li-Sha Zhang,&nbsp;Xiao-Ming Tao","doi":"10.1007/s10118-025-3470-z","DOIUrl":"10.1007/s10118-025-3470-z","url":null,"abstract":"<div><p>Polymer matrix composites with high dielectric constants and low dielectric losses are in high demand for flexible electronics. However, simultaneously satisfying these requirements poses a significant scientific challenge owing to the intrinsic trade-off relationship. Herein, we utilized the <i>in situ</i> controllable reduction of graphene oxide (GO) within a poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) matrix to regulate the dielectric properties. The as-obtained composite exhibited a high relative dielectric constant of 1415 coupled with a low loss tangent of 0.380 at 100 Hz. Experimental and theoretical studies indicate that the increased degree of electron conjugation and conductivity of the reduced GO (RGO) are responsible for the high-<i>k</i>. The constrained reduction degree of GO, combined with its homogeneous dispersion in the polymer matrix, effectively suppresses long-range charge carrier migration, thereby minimizing dielectric loss. This novel strategy could be successfully applied to both organic and aqueous systems. Furthermore, a high-performance flexible capacitive proximity sensor was exemplified by the optimization of both the dielectric layer and electrode pattern, exhibiting excellent sensitivity and stability. The fundamental mechanisms elucidated in this study provide crucial design principles for developing dielectric PMCs with tailored properties, thereby opening new avenues for advanced flexible electronic applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"116 - 126"},"PeriodicalIF":4.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340158","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 Magic of Organocatalytic Synergism in Switchable Polymerization: One-pot Synthesis of Block Copolymers with Programmable Sequences and Compositions 可切换聚合中有机催化协同作用的魔力:具有可编程序列和组成的嵌段共聚物的一锅合成
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-18 DOI: 10.1007/s10118-025-3476-6
Shuai-Shuai Zhu, Mao-Ji Zhao, Ying-Jie Yuan, Yong Wang
{"title":"The Magic of Organocatalytic Synergism in Switchable Polymerization: One-pot Synthesis of Block Copolymers with Programmable Sequences and Compositions","authors":"Shuai-Shuai Zhu,&nbsp;Mao-Ji Zhao,&nbsp;Ying-Jie Yuan,&nbsp;Yong Wang","doi":"10.1007/s10118-025-3476-6","DOIUrl":"10.1007/s10118-025-3476-6","url":null,"abstract":"<div><p>Switchable polymerization is emerging as a powerful tool to construct block copolymers directly from mixtures of monomers. However, current achievements typically iterate between two polymerization cycles to afford products with fixed sequences and compositions. Herein, we report the triethylborane/1,8-diazabicyclo[5.4.0]undec-7-ene (Et<sub>3</sub>B/DBU) pair-mediated four-component switchable polymerization of propylene oxide (PO), CO<sub>2</sub>, phthalic anhydride (PA), and racemic lactide (<i>rac</i>-LA), which enables the on-demand synthesis of four different block copolymers, <i>i.e.</i>, poly(propylene phthalate)-<i>b</i>-polylactide (PPE-<i>b</i>-PLA), PPE-<i>b</i>-PLA-<i>b</i>-poly(propylene carbonate) (PPC), PPE-<i>b</i>-PPC-<i>b</i>-PLA, and PPE-<i>b</i>-PPC-<i>b</i>-poly(propylene oxide) (PPO), through rationally modulating the Lewis pair (LP) ratio. Core to this protocol is that increasing the loading of Et<sub>3</sub>B accelerates the ring-opening of PO while impeding the reactivity of <i>rac</i>-LA, thus allowing for fine-tuning of the thermodynamic and kinetic of the switchable polymerization. Therefore, the four polymerization cycles involving PO/PA ring-opening copolymerization (ROCOP), PO/CO<sub>2</sub> ROCOP, <i>rac</i>-LA ring-opening polymerization (ROP), and PO ROP can be connected and discriminated in precisely programmed manners.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"68 - 78"},"PeriodicalIF":4.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340157","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
Nonmonotonic Stress Overshoot in Entangled Polymer Melts under Two-step Shear 两步剪切作用下纠缠聚合物熔体的非单调应力超调
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-18 DOI: 10.1007/s10118-025-3481-9
Yong-Jin Ruan, Ya-Qing Chang, Jiang-Yang Mo, Bai-Cheng Mei
{"title":"Nonmonotonic Stress Overshoot in Entangled Polymer Melts under Two-step Shear","authors":"Yong-Jin Ruan,&nbsp;Ya-Qing Chang,&nbsp;Jiang-Yang Mo,&nbsp;Bai-Cheng Mei","doi":"10.1007/s10118-025-3481-9","DOIUrl":"10.1007/s10118-025-3481-9","url":null,"abstract":"<div><p>Shear stress overshoot in entangled polymer rheology is a hallmark of transient dynamics, but its microscopic origin remains under debate. Using molecular dynamics simulations, we investigate a two-step shear protocol consisting of successive startup shears separated by a waiting period, with the first shear interrupted before the overshoot. In the homogeneous flow, the GLaMM theory captures the stress response during the first shear, but fails to reproduce the nonmonotonic dependence of the second stress overshoot (<i>σ</i><sub>2max</sub>) on the waiting time. Contrary to the prediction of a nonmonotonic normal stress component <i>σ</i><sub><i>yy</i></sub> during the waiting period, our simulations show that <i>σ</i><sub><i>yy</i></sub>, like the tube segment orientation (<i>S</i><sub><i>xy</i></sub>), the contour length of the primitive chain (<i>L</i>), and the entanglement number per chain (<i>Z</i>), relaxes monotonically toward equilibrium. At the strain corresponding to <i>σ</i><sub>2max</sub>, both the tube segment orientation and the entanglement number per chain exhibit a nonmonotonic dependence on the waiting time that closely mirrors the behavior of <i>σ</i><sub>2max</sub>, indicating that both factors play significant roles in governing <i>σ</i><sub>2max</sub>. Our findings are consistent with the interpretation of Ianniruberto and Marrucci [<i>ACS Macro. Lett.</i> <b>2014</b>, <i>3</i>, 552] for orientation effects and with the viewpoint of Wang <i>et al.</i> [<i>Macromolecules</i> <b>2013</b>, <i>46</i>, 3147] for entanglement effects, although the two explanations are rooted in distinct physical pictures. These results provide new insights into the stress responses of entanglement polymer fluids and underscore the need for a more unified theoretical framework.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"268 - 277"},"PeriodicalIF":4.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340159","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
Bio-derived Flame-retardant Curing Agents Enable One-step, Ambient Synthesis of Ultra-tough, Smoke-suppressed Epoxy 生物衍生阻燃固化剂,可一步合成超韧性、抑烟环氧树脂
IF 4 2区 化学
Chinese Journal of Polymer Science Pub Date : 2025-12-18 DOI: 10.1007/s10118-025-3471-y
Hang-Tian Hu, Dan Xie, Zheng-Hong Guo, Feng-Qing Chen, Xing-Wei He, Gao-Bo Lou, Jin-Feng Dai, Li-Na Liu
{"title":"Bio-derived Flame-retardant Curing Agents Enable One-step, Ambient Synthesis of Ultra-tough, Smoke-suppressed Epoxy","authors":"Hang-Tian Hu,&nbsp;Dan Xie,&nbsp;Zheng-Hong Guo,&nbsp;Feng-Qing Chen,&nbsp;Xing-Wei He,&nbsp;Gao-Bo Lou,&nbsp;Jin-Feng Dai,&nbsp;Li-Na Liu","doi":"10.1007/s10118-025-3471-y","DOIUrl":"10.1007/s10118-025-3471-y","url":null,"abstract":"<div><p>A simultaneous boost in toughness and fire safety of epoxy (EP) is achieved through solvent-free one-step neutralization of phytic acid with 1,8-diaminooctane to yield a multifunctional bio-based curing agent, PA-DAO. When used as the sole hardener, 5 wt% PA-DAO increased the tensile, flexural, and impact strengths by 165%, 81%, and 455%, respectively, over the parent amine system, whereas the tensile and flexural toughness increased by 1387% and 775%, respectively. At 25 wt% loading, the resin attained a UL-94 V-0 rating and a limiting oxygen index of 28.1%, accompanied by a 71% reduction in the peak heat-release rate and a 53% suppression of total smoke production. This facile, green protocol provides scalable access to ultra-tough, intrinsically flame-retardant epoxy networks without external plasticizers or additives.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"44 1","pages":"209 - 222"},"PeriodicalIF":4.0,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340160","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
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