Article
Polymer Science
Yubin Zhou, Zhongquan Peng, Jingqi Ji, Yancheng Wu, Zhigeng Chen, Haohao Huang, Shumei Liu, Jianqing Zhao
Summary: By synthesizing fluorinated redistributed poly(phenylene oxide) (F-rPP0), the thermal and dielectric properties of diglycidyl ether of bisphenol A (DGEBA) epoxy resin can be significantly improved, along with reduced moisture absorption.
EUROPEAN POLYMER JOURNAL
(2021)
Article
Polymer Science
Hui Yang, Guoming Yuan, Enxiang Jiao, Kunxin Wang, WenJie Diao, Zhao Li, Kun Wu, Jun Shi
Summary: In this study, two functionalized poly(phenylene oxide) (PPOs) were synthesized and used as curing agents to improve the thermal and dielectric properties of liquid crystal epoxy thermosets. The modified PPOs not only improved the compatibility and cross-linking of the PPOs with the epoxy monomers, but also avoided the generation of hydroxyl groups after curing. The overall performances of PPOs-based/t-BPDGE were significantly improved compared to conventional curing agents.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Jinzhao Li, Mengdi Chen, Yuechuan Wang
Summary: A novel fluorinated epoxy resin (FB-EP) with 45.7 wt% fluorine content was synthesized, and the cured FB-EP materials exhibited lower moisture absorption and dielectric constant compared to common diglycidol ether epoxy resin (BADGE). This research provides a foundation for further exploration of FB-EP as advanced electronic materials.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Applied
S. S. Nechausov, A. A. Aleksanova, O. S. Morozov, B. A. Bulgakov, A. Babkin, A. Kepman
Summary: Novel dual-functional phthalonitrile monomers containing a maleimide group were synthesized and characterized, showcasing a combination of bismaleimide resins' mechanical properties and phthalonitriles' thermo-oxidative stability. The copolymerization of maleimide groups via ene reaction and ring-opening amidation allowed the formation of a polymeric system with high impact strength, flexural strength, and excellent thermal properties.
REACTIVE & FUNCTIONAL POLYMERS
(2021)
Article
Polymer Science
Yanlin Liu, Yueran He, Zhen Yu, Jianfeng Tong, Sican Zhou, Wanding Chen, Zixian Ye, Zhaobin Tang
Summary: This study introduces long aliphatic chains into amino acid type latent curing agents to improve their latent performance and solubility. The latent performance of the curing agents improves with the increase of chain length. The synthetic amino acids with amide and ester bonds can improve the thermal and mechanical properties of the resin and provide degradability in alkaline environments. This work is of great importance for the recycling research of latent CFRP.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Jingjing Yan, Huan Wang, Junyang Zeng, Xin Zhang, Ce-Wen Nan, Shujun Zhang
Summary: In this study, a novel carboxylated poly (p-phenylene terephthalamide) (c-PPTA) is synthesized and used to enhance the dielectric constant and thermal resistance of polyetherimide (PEI), resulting in a discharged energy density of 6.4 J cm(-3) at 150 degrees C. The introduction of c-PPTA molecules reduces the pi-pi stacking effect and increases the average chain spacing between polymer molecules, improving the dielectric constant. Additionally, c-PPTA molecules with stronger positive charges and high dipole moments capture electrons, reducing conduction loss and enhancing breakdown strength at high temperatures. The coiled capacitor made with the PEI/c-PPTA film demonstrates superior capacitance performances and higher working temperatures compared to commercial metalized PP capacitors, showing great potential for dielectric polymers in high-temperature electronic and electrical energy storage systems.
Article
Materials Science, Multidisciplinary
B. Pascual-Jose, S. De la Flor, A. Serra, A. Ribes-Greus
Summary: The dielectric spectra of the poly(thiourethane) network, HDI-S3, were analyzed to understand the nature and cooperativity of each observed dielectric process. The Y1, Y2, and fi dielectric relaxations at low temperatures were attributed to noncooperative local motions in the glassy state, with apparent activation energies of 30, 36, and 60 kJ/mol, respectively. At higher temperatures, three dielectric relaxations were observed (alpha Tg, alpha*, p), with alpha Tg being attributed to the glass transition and overlapping with the alpha* relaxation. The molecular origin of the alpha* relaxation was associated with a bond exchange reaction, while the p relaxation was ascribed to sample heterogeneity, although its origin remained uncertain. The DC conductivity (sigma DC) was found to be a suitable variable for analyzing the bond exchange reaction, indicating a molecular exchange mechanism of dissociative nature in HDI-S3.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Polymer Science
Haodong Duan, Xiaolei Xu, Kangwei Leng, Sheng Zhang, Yuxi Han, Jun Gao, Qing Yu, Zhongwei Wang
Summary: The compound (4-fluorophenyl)(phenyl) phosphine oxide (4-FPO) was utilized to modify epoxy resin (EP), resulting in improved flame-retardant properties, hydrophobicity, and dielectric properties. The addition of 0.6wt% phosphorus in the 4-FPO-modified EP significantly enhanced the flame retardancy of the material, while also showing improvements in hydrophobic and dielectric properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Polymer Science
Liang Huang, Wenji Guo, Himangshu Mondal, Skye Schaefer, Thien N. Tran, Shouhong Fan, Yifu Ding, Haiqing Lin
Summary: Amorphous PDXL-based hyperbranched polymers with varied branch length show attractive CO2/N-2 and CO2/CH4 separation properties.
Article
Materials Science, Multidisciplinary
Weiwang Chen, Yueyan Sun, Jie Yang
Summary: Particulate poly (m-phenylene isophthalamide, PMIA) aerogels were prepared for the first time using a dropwise wet-curing method. These aerogel particles, with porous cores and dense shells, have a diameter of about 1.5 mm. The uniform and mostly nanoscale pores in the core give the prepared particulate PMIA aerogels attractive thermal insulation ability. Moreover, the conversion of PMIA to aerogels does not damage its chemical structure, indicating good high-temperature endurance. Therefore, the prepared particulate PMIA aerogels may have broad prospects for high-temperature thermal insulation applications.
Article
Polymer Science
Shu-Yi Zhan, Yue Han, Yu-Huan Wu, Jiang-Nan Ding, Xiang Liu, Ying Guo, Heng Zhou, Tong Zhao
Summary: In this study, a novel boron-containing monomer was synthesized and used to promote the curing process of a phthalonitrile monomer. The curing behaviors of the system were analyzed using thermal and rheological analysis, and a boron-containing Lewis acid curing mechanism was proposed and verified. The cured polymers showed excellent thermal stability and heat resistance, making this curing system a promising option for the design of high temperature thermosets.
CHINESE JOURNAL OF POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Chun-Kai Chen, Yan-Cheng Lin, Ender Ercan, Ping-Jui Yu, Jin-Chieh Ho, Mitsuru Ueda, Wen-Chang Chen
Summary: The research focuses on seeking durable dielectric materials for flexible electronics, with sulfonated PPEs showing promising results. Among them, PPE-9kS with the highest sulfone content of 63% exhibits the best dielectric properties in flexible OFET devices. With excellent mechanical and thermal stability, devices with PPE-9kS as dielectric show highly retained performance after cyclic bending or thermal treatment.
ORGANIC ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Zhimin Wang, Guixiang Hou, Jianqiang Xie, Zengping Zhang, Xiangkai Zhang, Jiajin Cai
Summary: This study focuses on the production of bio-based fluorinated epoxy resin SA-BTB-EP and its composite with DDM. The results showed that SA-BTB-EP/DDM exhibited improved storage modulus, carbon residue, dielectric properties, and hydrophobicity compared to DGEHBA/DDM. Moreover, the inclusion of a Schiff base structure in SA-BTB-EP led to enhanced flame retardancy and reduced combustion byproducts.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Polymer Science
Jiajia Ye, Zilin Fan, Shuai Zhang, Xiaobo Liu
Summary: The copolymerization of melamine-based benzoxazine resin (MBF) with epoxy resin E51 was carried out to improve the dielectric properties. It was found that the active functional groups in MBF could catalyze and copolymerize with E51, forming uniform copolymers poly(MBF-E) at various proportions. With the increase of epoxy resins, the water absorption and polarity of the copolymers decreased, and the dielectric constant decreased from 3.67 for poly(MBF) to 2.94 for poly(MBF-60E). Additionally, the tensile strength and elongation at break values increased significantly due to the higher crosslinking density and more flexible ether bond formed.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Polymer Science
Zhicheng Wang, Runjie Li, Qirui Qin, Mohamadou Al Hassan, Abdul Qadeer Dayo, Wenbin Liu, Jun Wang
Summary: The study found that blending a small amount of HB-PED230 can effectively reduce the curing temperature of CE resin, while improving the bending strength and impact strength. Additionally, it was observed that as the amount of HB-PED230 increased, the flexural strength and flexural modulus of the copolymers were improved.
POLYMERS FOR ADVANCED TECHNOLOGIES
(2022)
Article
Polymer Science
Meiying Ge, Jia-Tao Miao, Li Yuan, Qingbao Guan, Guozheng Liang, Aijuan Gu
JOURNAL OF APPLIED POLYMER SCIENCE
(2018)
Article
Materials Science, Composites
Quan Zhang, Qingbao Guan, Li Yuan, Aijuan Gu, Guozheng Liang
POLYMER COMPOSITES
(2018)
Article
Chemistry, Physical
Xuelin Fan, Jia-Tao Miao, Li Yuan, Qingbao Guan, Aijuan Gu, Guozheng Liang
APPLIED SURFACE SCIENCE
(2018)
Article
Chemistry, Physical
Qingbao Guan, Li Yuan, Yi Zhang, Aijuan Gu, Guozheng Liang
APPLIED SURFACE SCIENCE
(2018)
Article
Chemistry, Physical
Longhui Zheng, Li Yuan, Qingbao Guan, Guozheng Liang, Aijuan Gu
APPLIED SURFACE SCIENCE
(2018)
Article
Engineering, Multidisciplinary
Xianchao Han, Li Yuan, Aijuan Gu, Guozheng Liang
COMPOSITES PART B-ENGINEERING
(2018)
Article
Chemistry, Physical
Chunqing Lu, Li Yuan, Qingbao Guan, Guozheng Liang, Aijuan Gu
JOURNAL OF PHYSICAL CHEMISTRY C
(2018)
Article
Engineering, Multidisciplinary
Qingbao Guan, Li Yuan, Yi Zhang, Aijuan Gu, Guozheng Liang
COMPOSITES PART B-ENGINEERING
(2017)