文献类型：期刊文献

英文题名：Reinforcing the poly(silylene arylacetylene)s via strong π-π stacking interactions

作者：Ma, Manping[1];Dai, Nipin[1];Liu, Xiaotian[1];Li, Chuan[1];Yuan, Qiaolong[1];Huang, Farong[1]

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

年份：2021

卷号：229

外文期刊名：POLYMER

收录：;EI(收录号：20212710591973);WOS:【SCI-EXPANDED(收录号:WOS:000687338700002)】；

基金：The authors gratefully acknowledge the support of the Fundamental Research Funds for the Central Universities (No. JKD01211701) .

语种：英文

外文关键词：Silicon-containing arylacetylene resin; pi-pi stacking interaction; Reinforcing effect; High performance resin for advanced composites

摘要：Silicon-containing arylacetylene resins show a trade-off between mechanical property and heat resistance as usual. A strategy is proposed by utilizing the interchain pi-pi stacking interactions to obtain a resin with both high mechanical property and heat resistance. In this work, silicon-containing arylacetylene resins separately with 2,5-diphenyl- [1,3,4]-oxadiazole unit as pi-pi stacking precursors (PODSA-MM, PODSA-MP) and the phenylene unit (PESA-MM, PESA-MP) in the main chains were synthesized by Grignard reactions. The stronger interchain pi-pi stacking interactions in the PODSA resins compared with PESA resins were confirmed by UV-Vis, XRD, SAXS analyses, regardless of whether or not the resins are cured. The PODSA resins with more regular structures show higher melting temperature and melt viscosity. The stable physical and chemical crosslinking dual-networks caused by both strong interchain interactions and thermal crosslinking reactions are formed in cured PODSA resins. The cured PODSA resins exhibit higher secondary relaxation temperature (T-beta), mechanical properties and thermal conductivity than cured PESA resins. The enhancement of properties of the cured PODSA resins are mainly attributed to stronger intermolecular pi-pi stacking interactions derived from 2,5-diphenyl- [1,3,4]-oxadiazole unit.