Chinese Journal of Polymer Science最新文献_第8页

H2O2-Responsive Injectable Polymer Dots Hydrogel for Long-term Photodynamic Therapy of Tumors 用于肿瘤长期光动力疗法的 H2O2 反应性注射聚合物点水凝胶

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-26 DOI: 10.1007/s10118-024-3155-z

Jian Wang, Ke Liang, Jian Li, Yun-Xiu Zhang, Xiao-Kuang Xue, Tie-Jin Chen, Yong-Liang Hao, Jia-Sheng Wu, Jie-Chao Ge

{"title":"H2O2-Responsive Injectable Polymer Dots Hydrogel for Long-term Photodynamic Therapy of Tumors","authors":"Jian Wang, Ke Liang, Jian Li, Yun-Xiu Zhang, Xiao-Kuang Xue, Tie-Jin Chen, Yong-Liang Hao, Jia-Sheng Wu, Jie-Chao Ge","doi":"10.1007/s10118-024-3155-z","DOIUrl":"10.1007/s10118-024-3155-z","url":null,"abstract":"<div><p>Photodynamic therapy (PDT) has been emerged as a promising modality for cancer treatment. However, the development of drug delivery system enabling continuous release of photosensitizers (PSs) for long-term PDT treatment still remains challenges. Herein, a H<sub>2</sub>O<sub>2</sub>-responsive injectable hydrogel, covalently crosslinked by N<sup>1</sup>-(4-boronobenzyl)-N<sup>3</sup>-(4-boronophenyl)-N<sup>1</sup>,N<sup>1</sup>,N<sup>3</sup>,N<sup>3</sup>-tetramethylpropane-1,3-diaminium (TSPBA) with PVA containing polythiophene quaternary ammonium salt (PT2) polymer dots (PDots) as a photosensitizer was fabricated. Under the stimulation of H<sub>2</sub>O<sub>2</sub>, the obtained injectable hydrogel gradually degrades and releases PDots. <i>In vitro</i> experiments suggested that the released PDots could realize efficient tumor cells inhibition through its robust singlet oxygen generation capability upon 577 nm laser irradiation. <i>In vivo</i> studies demonstrated a sustained retention of PDots for at least 7 days following single-dose administration, facilitating efficient tumor inhibition with light treatments for 3 times without apparent biotoxicity. This work presents an innovative polymer dots-based composite local drug delivery system for long-term PDT in cancer treatment.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 11","pages":"1690 - 1698"},"PeriodicalIF":4.1,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141496239","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

Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes 热固温度对 PP/HDPE 双层微孔膜的微孔结构和性能的影响

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-26 DOI: 10.1007/s10118-024-3157-x

Jie Xie, Yong-Shi Wu, Jia-Yi Xie, Rui-Jie Xu, Cai-Hong Lei, Sai-Nan Song, Guang-Quan Li, An-Ping Huang

{"title":"Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes","authors":"Jie Xie, Yong-Shi Wu, Jia-Yi Xie, Rui-Jie Xu, Cai-Hong Lei, Sai-Nan Song, Guang-Quan Li, An-Ping Huang","doi":"10.1007/s10118-024-3157-x","DOIUrl":"10.1007/s10118-024-3157-x","url":null,"abstract":"<div><p>Due to the mechanical stability of PP layer, the PP/HDPE double-layer microporous membrane could be prepared at a higher heat-setting temperature than that of PE monolayer membrane. In this work, the effects of heat-setting temperature on the pore structure and properties of PP/HDPE double-layer membrane were studied. With the increase of heat-setting temperature from 120 °C to 130 °C, the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during heat-setting. The corresponding air permeability, porosity, wettability of liquid electrolyte and mechanical property of the heat-set microporous membrane increase, exhibiting better electrochemical performance. However, when the heat-setting temperature is further increased to 140 °C, higher than the melting point of PE resin, some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting, resulting in a decrease of air permeability and porosity. In contrast, there is negligible change in the PP layer within the above heat-setting temperature region. This study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting, which is helpful to guide the production of high-performance PP/PE/PP lithium batteries separator.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 8","pages":"1243 - 1252"},"PeriodicalIF":4.1,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141547065","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

Shear-thinning Catechol-modified Chitosan Hydrogel Loaded with Silver Nanoparticles for Endoscopic Submucosal Dissection 剪切稀化儿茶酚改性壳聚糖水凝胶载银纳米粒子用于内窥镜粘膜下剥离术

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-26 DOI: 10.1007/s10118-024-3146-0

Wen-Jun Feng, Yan-He Wu, Xiao-Yang Liu, Zheng-Ke Wang

{"title":"Shear-thinning Catechol-modified Chitosan Hydrogel Loaded with Silver Nanoparticles for Endoscopic Submucosal Dissection","authors":"Wen-Jun Feng, Yan-He Wu, Xiao-Yang Liu, Zheng-Ke Wang","doi":"10.1007/s10118-024-3146-0","DOIUrl":"10.1007/s10118-024-3146-0","url":null,"abstract":"<div><p>Shear-thinning hydrogels have emerged for endoscopic submucosal dissection, while wound intervention after surgery has rarely been mentioned. Herein, a catechol-modified chitosan hydrogel with shear-thinning property was developed for simultaneously facilitating endoscopic submucosal dissection and postoperative wound healing. Benefiting from the shear-thinning and self-healing characteristics, the asprepared hydrogel showed easily endoscopic injectability. It also performed very well as submucosal cushion, which could remain above 70% after injection for 120 min in <i>ex vivo</i> porcine large intestine model. In fact, the cushion height of normal saline dramatically decreased to 46% of the initial height at 30 min. Ag nanoparticles encapsulated into the network endowed the hydrogel with almost reached 100% antibacterial effect against <i>E. coli</i> and <i>S. aureus</i>. The hemolysis ratio of the hydrogel was calculated to be as low as 0.8%. Combined with good hemocompatibility and cytocompatibility, the as-prepared hydrogel displayed much higher <i>in vivo</i> wound closure and healing efficacy than normal saline. These results demonstrated the superiority of the shear-thinning chitosan hydrogel in facilitating clinical endoscopic submucosal dissection surgery.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 8","pages":"1147 - 1155"},"PeriodicalIF":4.1,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141523332","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

Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers: Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties 释放生物基热致变性液晶改性剂的能量：在不影响其他性能的前提下增韧和增强石油基环氧树脂

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-26 DOI: 10.1007/s10118-024-3149-x

Qing-Yun Lu, Hong-Wei Gu, Jia-Hui Li, Qian-Qian Fan, Bei-Tao Liu, Yan Kou, Xi-Gao Jian, Zhi-Huan Weng

{"title":"Unleashing the Power of Bio-based Thermotropic Liquid Crystal Modifiers: Toughening and Reinforcing Petroleum-based Epoxy Resin without Compromising Other Properties","authors":"Qing-Yun Lu, Hong-Wei Gu, Jia-Hui Li, Qian-Qian Fan, Bei-Tao Liu, Yan Kou, Xi-Gao Jian, Zhi-Huan Weng","doi":"10.1007/s10118-024-3149-x","DOIUrl":"10.1007/s10118-024-3149-x","url":null,"abstract":"<div><p>Toughening the petroleum-based epoxy resin blends with bio-based modifiers without compromising their modulus, mechanical strength, and other properties is still a big challenge in view of the sustainability. In this study, a bio-based liquid crystal epoxy resin (THMT-EP) with an <i>s</i>-triazine ring structure was utilized to modify a petroleum-based bisphenol A epoxy resin (E51) with 4,4′-diaminodiphenylsulfone (DDS) as a curing agent, and the blended systems were evaluated for their thermal stability, mechanical properties, and flame retardancy. The results showed that the impact strength of the blended system initially increased and then decreased with the increase in THMT-EP content, and it reached the a maximum value of 26.5 kJ/m<sup>2</sup> when the THMT-EP content was 5%, which was 31.2% higher than that of E51/DDS. Notably, the flexural strength, modulus, and glass transition temperature of the blended system were all simultaneously improved with the addition of THMT-EP. At the same time, the addition of THMT-EP enhanced the flame retardancy of the system by increasing the char yield at 700 °C and decreasing the peak heat release rate and total heat release rate. This work paves the way for a more sustainable improvement in the comprehensive performance of epoxy resin.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 8","pages":"1093 - 1102"},"PeriodicalIF":4.1,"publicationDate":"2024-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503320","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 PVA/GO/h-BN Janus Film with High Thermal Conductivity and Excellent Flexibility via a Density Deposition Self-assembly Method 通过密度沉积自组装法制备具有高导热性和优异柔韧性的 PVA/GO/h-BN Janus 薄膜

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-07 DOI: 10.1007/s10118-024-3154-0

Fang-Hua Luo, Zhi-Tao Dong, Guo-Hua Chen, Chen Ma, Huai-Yuan Wang

{"title":"Preparation of PVA/GO/h-BN Janus Film with High Thermal Conductivity and Excellent Flexibility via a Density Deposition Self-assembly Method","authors":"Fang-Hua Luo, Zhi-Tao Dong, Guo-Hua Chen, Chen Ma, Huai-Yuan Wang","doi":"10.1007/s10118-024-3154-0","DOIUrl":"10.1007/s10118-024-3154-0","url":null,"abstract":"<div><p>Janus films with asymmetric physical/chemical properties have attracted considerable attention due to their promising applications in personal thermal management, electronic skins, sensors, actuators, etc. However, traditional methods for fabricating Janus films conventionally need the assistance of an interface or auxiliary equipment, which are usually complex and time-consuming. Herein, flexible poly(vinyl alcohol) (PVA)/graphene oxide (GO)/h-BN (recorded as PVA/GO/h-BN) Janus films with thermally, optically, and electrically anisotropic properties are fabricated by a simple density deposition self-assembly method, which just utilizes the density difference between GO and h-BN during water evaporation. Experimental results show that the two sides of the acquired Janus films have obvious asymmetric characteristics. In the original state of the PVA/GO/h-BN Janus films, the thermal conductivity of the GO side (10.06 W·m<sup>−1</sup>·K<sup>−1</sup>) is generally lower than that of the h-BN side (10.48 W·m<sup>−1</sup>·K<sup>−1</sup>). But after GO is reduced, the thermal conductivity of the rGO side reaches 12.17 W·m<sup>−1</sup>·K<sup>−1</sup>, surpassing that of the h-BN side. In addition, the relative reflectance of the h-BN side of Janus film is also significantly higher than that of the rGO side, and the surface resistance difference between the two sides is about 4 orders of magnitude. The prepared PVA/GO/h-BN Janus films show great application potential in human thermal management, light conversion switches, and electronic skins. This study provides a simple and versatile strategy for fabricating Janus films with multifunctional (such as thermal, optical, and electrical) anisotropies.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 8","pages":"1217 - 1226"},"PeriodicalIF":4.1,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141371110","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

Swelling of Spherical Polyelectrolyte Gels 球形聚电解质凝胶的膨胀

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-06 DOI: 10.1007/s10118-024-3152-2

Ming-Yu Duan, Jia-Dong Chen, Yi-Ming Liu, Zhao-Feng Peng, Guang Chen

引用次数: 0

Competition of Composition Fluctuation Modes in Weakly Segregated Salt-doped Symmetric Diblock Copolymers 弱分离盐掺杂对称二嵌段共聚物中成分波动模式的竞争

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-06 DOI: 10.1007/s10118-024-3145-1

Yuan-Xin Zhou, Xian Kong

{"title":"Competition of Composition Fluctuation Modes in Weakly Segregated Salt-doped Symmetric Diblock Copolymers","authors":"Yuan-Xin Zhou, Xian Kong","doi":"10.1007/s10118-024-3145-1","DOIUrl":"10.1007/s10118-024-3145-1","url":null,"abstract":"<div><p>Salt-doped block copolymers have widespread applications in batteries, fuel cells, semiconductors, and various industries, where their properties crucially depend on phase separation behavior. Traditionally, investigations into salt-doped diblock copolymers have predominantly focused on microphase separation, overlooking the segregation between ionic and polymeric species. This study employs weak segregation theory to explore the interplay between phase separation dominated by the polymer-modulated mode and the salt-out-modulated mode, corresponding to microscopic and macroscopic phase separations, respectively. By comparing diblock copolymers doped with salts to those doped with neutral solvents, we elucidate the significant role of charged species in modulating phase behavior. The phase separation mode exhibits a transition between the polymer-modulated and salt-out-modulated modes at different wavenumbers. In systems doped with neutral solvents, this transition is stepwise, while in salt-ion-doped systems, it is continuous. With a sufficiently large Flory-Huggins parameter between ions and polymers, the salt-out-modulated mode becomes dominant, promoting macrophase separation. Due to the solvation effect of salt ions, salt-doped systems are more inclined to undergo microphase separation. Furthermore, we explore factors influencing the critical wavenumber of phase separation, including doping level and the Flory-Huggins parameters between two blocks and between ions and polymeric species. Our findings reveal that in a neutral solvent environment, these factors alter only the boundary between micro- and macro-phase separations, leaving the critical wavenumber unchanged in microphase separation cases. However, in a salt-doped environment, the critical wavenumber of microphase separation varies with these parameters. This provides valuable insights into the pivotal role of electrostatics in the phase separation of salt-doped block copolymers.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 9","pages":"1375 - 1385"},"PeriodicalIF":4.1,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377372","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

Friction between Strongly Compressed Polymer Brushes 强压缩聚合物刷之间的摩擦力

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-05 DOI: 10.1007/s10118-024-3151-3

Qi Liao

{"title":"Friction between Strongly Compressed Polymer Brushes","authors":"Qi Liao","doi":"10.1007/s10118-024-3151-3","DOIUrl":"10.1007/s10118-024-3151-3","url":null,"abstract":"<div><p>We present the results of molecular dynamics simulations of steady shear between a pair of neutral polymer brushes, as well as a pair of charged polymer brushes in the strongly compressed regime. The results of the molecular dynamic simulations of neutral and polyelectrolyte brushes in implicit solvent including normal forces, shear forces, viscosities and friction coefficients as a function of separation between brushes, are presented in the study. The comparison of the simulation results of neutral and charged brushes shows that the charged brushes is in the quasi-neutral regime, and the dependence of viscosity on the separation distance show the similar power law of neutral brushes. Our simulation results confirm that the implicit solvent simulations of polyelectrolyte brushes that ignore hydrodynamics interaction are in agreement with the scaling predictions qualitatively because of screening of hydrodynamic interaction and long-range electrostatic interactions on the correlation length scale. Both of neutral and charged brushes show the lubrication properties that the friction coefficient decreases with the separation decreases at enough large loads. However, a maximum of friction coefficients is observed for polyelectrolyte brushes, which is in contrast to the neutral brushes with monotonical dependence.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 9","pages":"1368 - 1374"},"PeriodicalIF":4.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141386191","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

Numerical Study of Two Opposing Weak Polyelectrolyte Brushes by the Self-consistent Field Theory 利用自洽场理论对两个对立弱聚电解质刷进行数值研究

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-05 DOI: 10.1007/s10118-024-3139-z

Bei-Ning Wang, Huan-Da Ding, Zhi-Kuan Chen, Chao-Hui Tong

{"title":"Numerical Study of Two Opposing Weak Polyelectrolyte Brushes by the Self-consistent Field Theory","authors":"Bei-Ning Wang, Huan-Da Ding, Zhi-Kuan Chen, Chao-Hui Tong","doi":"10.1007/s10118-024-3139-z","DOIUrl":"10.1007/s10118-024-3139-z","url":null,"abstract":"<div><p>The self-consistent field theory (SCFT) was employed to numerically study the interaction and interpenetration between two opposing weak polyelectrolyte (PE) brushes formed by grafting weak PE chains onto the surfaces of two long and parallel columns with rectangular-shaped cross-section immersed in a salty aqueous solution. The dependences of the brush heights and the average degree of ionization on various system parameters were also investigated. When the brush separation is relatively large compared with the unperturbed brush height, the degree of interpenetration between the two opposing PE brushes was found to increase with increasing grafting density and bulk degree of ionization. The degree of interpenetration also increases with the bulk salt concentration in the osmotic brush regime. Numerical results further revealed that, at a brush separation comparable to the unperturbed brush height, the degree of interpenetration does not increase further with increasing bulk degree of ionization, bulk salt concentration in the osmotic regime and grafting density. The saturation of the degree of interpenetration with these system parameters indicates that the grafted PE chains in the gap between the two columns retract and tilt in order to reduce the unfavorable electrostatic and steric repulsions between the two opposing PE brushes. Based on salt ion concentrations at the midpoint between the two opposing brushes, a quantitative criterion in terms of the unperturbed brush height and Debye screening length was established to determine the threshold value of the brush separation beyond which they are truly independent from each other.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 11","pages":"1668 - 1678"},"PeriodicalIF":4.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141382751","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

Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s 分子链的柔韧性和高频介电损耗：聚酯酰亚胺中酯键排列的影响

IF 4.1 2区化学

Chinese Journal of Polymer Science Pub Date : 2024-06-05 DOI: 10.1007/s10118-024-3140-6

Ya-Dong Li, Hong Li, Lu-Kun Feng, Feng Bao, Ming-Liang Wang, Cai-Zhen Zhu, Zhao-Hui Zheng, Xiao-Bin Ding, Jian Xu

{"title":"Molecular Chain Flexibility and Dielectric Loss at High-Frequency: Impact of Ester Bond Arrangement in Poly(ester imide)s","authors":"Ya-Dong Li, Hong Li, Lu-Kun Feng, Feng Bao, Ming-Liang Wang, Cai-Zhen Zhu, Zhao-Hui Zheng, Xiao-Bin Ding, Jian Xu","doi":"10.1007/s10118-024-3140-6","DOIUrl":"10.1007/s10118-024-3140-6","url":null,"abstract":"<div><p>The evolution of high-frequency communication has accentuated the significance of controlling dielectric properties in polymer media. Traditionally, it has been theorized that rigid molecular chains lead to lower dielectric loss. However, the validity of this proposition at high frequencies remains uncertain. To scrutinize the correlation between chain flexibility and dielectric properties, we synthesized six poly(ester imide)s (PEIs) with systematically varied molecular chain flexibilities by modifying the ester’s substitution on the aromatic ring. The introduction of ester bonds bestowed all PEI films with a low dielectric dissipation factor (<i>D</i><sub>f</sub>), ranging from 0.0021 to 0.0038 at 10 GHz in dry conditions. The dry <i>D</i><sub>f</sub> displayed a pattern consistent with volume polarizability (<i>P/V</i>). Unexpectedly, PI-mmm-T, featuring the most flexible molecular chain, exhibited the lowest dielectric loss under both dry (0.0021 @ 10 GHz) and hygroscopic (0.0029 @ 10 GHz) conditions. Furthermore, the observed increase in <i>D</i><sub>f</sub> after humidity absorption suggests that the high dielectric loss of PEI in applications may be attributed to its hygroscopic nature. Molecular simulations and characterization of the aggregation structure revealed that the smaller cavities within flexible molecular chains, after close stacking, impede the entry of water molecules. Despite sacrificing high-temperature resistance, the precursor exhibited enhanced solubility properties and could be processed into high-quality films. Our research unveils new insights into the relationship between flexibility and high-frequency dielectric loss, offering innovative perspectives on synthesizing aromatic polymers with exceptional dielectric properties.</p></div>","PeriodicalId":517,"journal":{"name":"Chinese Journal of Polymer Science","volume":"42 8","pages":"1122 - 1133"},"PeriodicalIF":4.1,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141385329","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