文献类型：期刊文献

英文题名：Poly(silylene arylacetylene)s containing hexafluoroisopropylidene with attractive mechanical properties and dielectric performance for wave-transparent composites

作者：Gong, Changjun[1];Huang, Xiaohan[1];Lv, Shuaikang[1];Li, Jixian[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 Tec, Minist Educ, Shanghai, Peoples R China

年份：2023

卷号：7

期号：20

起止页码：5015

外文期刊名：MATERIALS CHEMISTRY FRONTIERS

收录：;EI(收录号：20233714702656);WOS:【SCI-EXPANDED(收录号:WOS:001076686500001)】；

基金：This work was supported by the Fundamental Research Funds for the Central Universities (JKD01231701).

语种：英文

外文关键词：Bending strength - Curing - Dielectric losses - Ethers - Shear strength - Thermodynamic stability

摘要：High mechanical properties and excellent dielectric properties are important research subjects for the application of heat-resistant poly(silylene arylacetylene)s(PSAs) in advanced wave-transparent composites. Herein, three novel poly(silylene arylacetylene)s containing the hexafluoroisopropylidene structure were synthesized by Grignard reactions. The effects of aryl ether units and -CF3 groups on the mechanical properties, dielectric properties, and thermal stability of the cured PSA resins have been investigated. The PSA resins exhibit good solubility, processability, and high thermal stability with the temperature at 5% weight loss (Td5) above 478 degrees C. Due to the introduction of flexible aryl ether units, the flexural strength of the resins arrives at over 75.1 MPa. Due to the large free volume and electronic effect of -CF3 groups, the dielectric properties of the cured PSA resins are largely improved. The dielectric constant (epsilon) and dielectric loss (tan delta) reach as low as 2.53 and 2.13 x 10-3 at 30 MHz, respectively. Finally, quartz fiber-reinforced wave-transparent composites are prepared. The composites exhibit good mechanical properties, with the highest flexural strength and interlaminar shear strength (ILSS) reaching 395 MPa and 32.0 MPa, respectively. Meanwhile, the epsilon and tan delta values of the composites are below 3.26 and 3.84 x 10-3 in the range of 7-17 GHz, respectively, and the wave transmittances (|T|2) are higher than 91%. The introduction of hexafluoroisopropylidene and aryl ether units endows the poly(silylene arylacetylene)s with attractive dielectric performance and mechanical properties.