文献类型：期刊文献

英文题名：Perfluorocyclobutyl aryl ether-based poly(silylene arylacetylene)s with a low dielectric constant for advanced wave-transparent composites

作者：Gong, Changjun[1];Huang, Xiaohan[1];Li, Jixian[1];Lv, Shuaikang[1];Zhou, Yan[1];Tang, Junkun[1];Huang, Farong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：181

外文期刊名：EUROPEAN POLYMER JOURNAL

收录：;EI(收录号：20224413043498);WOS:【SCI-EXPANDED(收录号:WOS:000884840800003)】；

基金：Acknowledgements This work was supported by the Fundamental Research Funds for the Central Universities (JKD01221701) .

语种：英文

外文关键词：Poly(silylene arylacetylene); Fluoropolymer; Dielectric properties; Functional polymer composite; Wave-transparent material

摘要：A high-performance matrix with good mechanical properties, low dielectric constant as well as high thermal stability for advanced composites is in demand for the aerospace industry. In this study, novel per-fluorocyclobutyl aryl ether-based poly(silylene arylacetylene)s (PSFCBs) were synthesized, which can be con-verted to amorphous crosslinked networks via thermal crosslinking reactions at a low temperature. The thermal decomposition temperature at 5 wt% loss (Td5) of cured PSFCBs is around 440 degrees C and there is no glass transition temperature (Tg) below 380 degrees C. Among them, the cured PSFCB-P with the phenylmethylsilylene structure dis-plays the optimal comprehensive performance. Dielectric constant (epsilon) and dielectric loss (tan delta) are respectively 2.45 and 1.5 x 10-3 at 30 MHz, and the theoretical transmittance |T|2 arrives at 95.1 %. The flexural strength of the cured PSFCB-P reaches 52.5 MPa. Quartz fiber cloth/PSFCB-P composites show good dielectric properties (epsilon of 3.22) in the high-frequency range (7 GHz to 17 GHz) and high mechanical properties (flexural strength of 324.5 MPa, ILSS of 30.5 MPa). Positron annihilation lifetime spectroscopy (PALS) indicates that the cured PSFCB-P has a high free volume beneficial to the decrease of the epsilon.