文献类型：期刊文献

英文题名：Effect of substituted positions of acetylene groups in benzene rings on the properties of poly(silane arylether arylacetylene)s

作者：Li, Jixian[1];Gong, Changjun[1];Tang, Junkun[1];Yuan, Qiaolong[1];Liu, Zuozhen[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：2023

卷号：55

期号：12

起止页码：1307

外文期刊名：POLYMER JOURNAL

收录：;EI(收录号：20232914399009);WOS:【SCI-EXPANDED(收录号:WOS:001026533900001)】；

基金：AcknowledgementsThe authors gratefully acknowledge the support of the Fundamental Research Funds for the Central Universities (JKD01231701).

语种：英文

外文关键词：Benzene - Fourier transform infrared spectroscopy - Lighting - Nuclear magnetic resonance spectroscopy - Resins - X ray powder diffraction

摘要：Performing investigations on the structure-property relationship of poly(silane arylether arylacetylene)s (PSEAs) is very important and instructive for designing novel high-performance polymers. In this work, three bifunctional acetyleneterminated triphenyl-ether monomers with either para-acetylene, meta-acetylene or ortho-acetylene, i.e., 1,3-bis(4 ' ethynylphenoxy)benzene (pmp-BEPB), 1,3-bis(3 '-ethynylphenoxy)benzene (mmm-BEPB) and 1,3-bis(2 '-ethynylphenoxy) benzene ( omo-BEPB) were synthesized and used to prepare three PSEA resins, namely, pmp-PSEA, mmm-PSEA and omoPSEA. The PSEA resins were characterized by 1H-nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction analysis, and the properties were explored. The resins possess a wide processing window in the following order: pmp-PSEA < mmm-PSEA < omo-PSEA. The DSC results revealed that pmp-PSEA shows the highest reactivity, followed by omo-PSEA and mmm-PSEA. In the cured networks of the resins, the densities increase in the following order: pmp-PSEA-C < mmm-PSEA-C < omo-PSEA-C. Compared with pmp-PSEA-C, mmm-PSEA-C possesses better mechanical properties with a flexural strength of 66.5 MPa and a flexural modulus of 3.71 GPa. The decomposition temperatures of 5% weight loss (T-d5) of pmp-PSEA-C and mmm-PSEA-C are over 530 degrees C.