文献类型：期刊文献

英文题名：Synchronous improvement in mechanical properties and dielectric performance of poly(silylene arylether arylacetylene) by introducing trifluoromethyl groups

作者：Gong, Changjun[1];Lv, Shuaikang[1];Liu, Shuyue[1];Yuan, Qiaolong[1];Tang, Junkun[1];Huang, Farong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai, Peoples R China

年份：2024

卷号：62

期号：18

起止页码：4289

外文期刊名：JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20242616531563);WOS:【SCI-EXPANDED(收录号:WOS:001255235400001)】；

基金：This work was supported by the Fundamental Research Funds for the Central Universities (JKD01241701).

语种：英文

外文关键词：dielectric properties; fluoropolymer; poly(silylene arylether arylacetylene); trifluoromethyl substituted poly(silylene arylacetylene); wave-transparent composite

摘要：Poly(silylene arylether arylacetylene) (PSEA) resin is a promising material for preparing an advanced wave-transparent composite because of excellent thermal stability and good dielectric properties. Herein, a novel poly(silylene arylether arylacetylene) resin with trifluoromethyl groups (PSEAF) was synthesized by Grignard coupling reaction, and the effects of the incorporation of trifluoromethyl groups on various properties of PSEAF resin and quartz fiber reinforced composites were investigated. Compared to PSEA, the PSEAF resin exhibits better solubility and processability, and lower apparent activation energy for curing reactions. After thermal curing reactions, the PSEAF resin converts to an amorphous crosslinked network with the temperature at 5% weight loss (Td5) around 470 degrees C. The cured PSEAF resin possesses improved mechanical properties and dielectric properties. The flexural strength arrives at 64.4 MPa, and the dielectric constant (epsilon) and dielectric loss (tan delta) at 30 MHz are 2.75 and 4.3 x 10-3, respectively. Besides, the quartz fiber reinforced PSEAF composite simultaneously shows epsilon of 3.3, theoretical wave transmittance |T|2 of 91.4% at 7 GHz, and flexural strength of 350 MPa. image