文献类型：期刊文献

英文题名：Microcellular long-chain branched polyphenylene oxide (PPO) with excellent comprehensive properties and comprehensive analysis of its dielectric properties

作者：Yu, Jiabao[1,2];Chen, Yichong[1,3];Zhong, Wenyu[1];Hu, Dongdong[1];Jia, Xingyu[1];Sun, Jiayang[1];Jiang, Yi[1];Jiang, Xiulei[2];Wang, Huifeng[3];Zhao, Ling[1,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Suzhou Shincell New Mat Co Ltd, Suzhou 215151, Peoples R China;[3]East China Univ Sci & Technol, Sch Informat Sci & Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Shanghai Elect Chem Innovat Inst, Shanghai 201419, Peoples R China

年份：2024

卷号：214

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20242116137965);WOS:【SCI-EXPANDED(收录号:WOS:001266091700001)】；

基金：This work was supported by the National Natural Science Foundation of China (22308097) , the National Key Research and Development Program of China (2016YFB0302200) , the Fundamental Research Funds for the Central Universities (JKA012011002) , the 111 Project (B20031) , and Shanghai Post-doctoral Excellence Program of China (2022756) .

语种：英文

外文关键词：Microcellular polyphenylene oxide; Long-chain branched structure; Low dielectric properties

摘要：High-frequency and high-speed communications impose stringent requirements on low-dielectric materials with exceptional comprehensive properties. The development of dielectric materials with low dielectric constants and low dielectric dissipation factors holds significant value in reducing interconnect delay, power consumption, and crosstalk in high-frequency communication. In this study, polyphenylene oxide (PPO), known for its excellent properties, was chosen as the base material. Modified PPO with a long-chain branched structure was prepared using the multi-epoxy modifier ADR-4468. The increase in molecular weight and the formation of a long-chain branched structure improved the thermal stability, flexural properties, and foamability of PPO. Introduction of low-dielectric air into the material was achieved through supercritical CO2 foaming, resulting in a series of microcellular PPO foams exhibiting low dielectric properties (with a dielectric constant as low as 1.12 and a dielectric dissipation factor as low as 0.000636). Concurrently, the dielectric properties of microcellular PPO foams were examined at 10 GHz, revealing that the foam's dielectric properties were minimally impacted by the properties of the raw materials. Based on water absorption analysis, an improved equation for calculating the dielectric dissipation factor was proposed, comprehensively analyzing the influencing factors on the foam's dielectric dissipation factor. The study unveiled that water absorption significantly affects the foam's dielectric dissipation factor, and under high expansion ratios, water absorption's impact on the dielectric dissipation factor exceeds that of air introduction. These microcellular PPO foams, possessing excellent comprehensive properties and low dielectric characteristics, hold promise for applications in the realm of high-frequency and high-speed communications.