文献类型：期刊文献

英文题名：Benzoxazines containing amide bonds and the toughening effect of amide bonds on polybenzoxazine

作者：Zhang, Yihan[1];Zhang, Xuanfeng[2];Zhan, Guozhu[2];Zhuang, Qixin[1];Liu, Xiaoyun[1]

机构：[1]East China Univ Sci & Technol, Lab Specially Funct Polymer Mat & Related Technol, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Space Prop Technol Res Inst, Shanghai 201109, Peoples R China

年份：2025

卷号：82

期号：6

起止页码：1973

外文期刊名：POLYMER BULLETIN

收录：;EI(收录号：20245017516291);WOS:【SCI-EXPANDED(收录号:WOS:001370322400001)】；

基金：This work was financially supported by the National Natural Science Foundation of China (No. 22171086 and 52373073).

语种：英文

外文关键词：Benzoxazine; Toughening effect; Hydrogen bond

摘要：Traditional methods for modifying benzoxazine generally increase the toughness at the expense of the strength of the material. In this study, amide bonds were introduced into a main-chain-type benzoxazine to improve the toughness of cured materials, thereby addressing the balance between toughness and strength. This study investigated three main-chain-type benzoxazine monomers, Bz-bpa, Bz-oxy, and Bz-dia, each containing a different number of amide groups, resulting in a different number of additional hydrogen bonds. The polybenzoxazine, PBz-dia, which contains three amide bonds per repeating unit, exhibited a tensile strength of 107 MPa and an elongation at break of 3.8%; these values were 197 and 100% higher, respectively, than those of conventional bisphenol A-type polybenzoxazine and 55 and 23% higher than those of PBz-bpa, respectively. The results revealed that the introduction of amide bonds improved both the strength and toughness of polybenzoxazine and slightly improved the thermal stability of the cured material. This study demonstrated that changing the strength of the hydrogen bonds in polybenzoxazine by changing the number of amide bonds can balance the strength and toughness of a polybenzoxazine; this approach is instructive for toughening studies involving other thermosetting resins.