文献类型：期刊文献

英文题名：Synthesis and characterization of poly(benzoxazine-co-siloxane) oligomers end-capped with arylacetylene

作者：Liu, Lele[1];Wang, Fan[1];Wang, Xiaohan[2];Zhu, Yaping[1];Qi, Huimin[1,3]

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;[2]Shanghai Aerosp Equipments Manufacturer Co Ltd, Shanghai, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：63

期号：1

起止页码：281

外文期刊名：POLYMER ENGINEERING AND SCIENCE

收录：;EI(收录号：20225013220600);WOS:【SCI-EXPANDED(收录号:WOS:000888076100001)】；

基金：ACKNOWLEDGMENTS This work is supported by the Key Laboratory of Specially Functional Polymeric Materials and Related Technology of the Ministry of Education, the East China University of Science and Technology, and the Fundamental Research Funds for the Central Universities (50321041918013, 50321041917001).

语种：英文

外文关键词：heat resistance; oligomers; polybenzoxazine; siloxane; terminal alkynyl groups

摘要：Four poly(benzoxazine-co-siloxane) oligomers (PBcSs) were successfully synthesized by improving the synthesis step and controlling the ratio of phenol, bisphenol A, 1,3-bis(3-aminopropyl)tetramethyldisiloxane, m-aminophenyl acetylene, and formaldehyde; the resulting compounds all exhibited good processing properties. Siloxane addition can significantly improve the toughness of the polybenzoxazines. Additionally, compared with the PBcSs containing only phenol structure, the introduction of bisphenol A has a decelerating effect on the polymerization process of the benzoxazine oligomer, which leads to an increase in the exothermic peak temperature. Simultaneously, the PBcS containing bisphenol A also exhibits a higher glass transition temperature and increased thermal stability, but reduced flexural strength. Conversely, compared to the benzoxazine oligomers that do not contain alkynyl groups, the introduction of the terminal alkynyl group can accelerate the polymerization process, decrease the exothermic peak temperature, significantly increase the glass transition temperature, and greatly improve the heat resistance; the 5% thermal decomposition temperature of cured product is increased by up to 101?. Furthermore, under conditions that ensure high flexural strength, appropriate alkynyl content can also significantly increase the material's flexural modulus.