超支化有机硅-酚醛复合材料的制备与性能  

Preparation and Properties of Hyperbranched Silicone-Phenolic Composites

作　　者：韩庆文 袭锴 Qingwen Han;Kai Xi(MOE Key Laboratory of High Performance Polymer Materials&Technology(Nanjing University),Nanjing 210023,China)

机构地区：[1]高性能高分子材料与技术教育部重点实验室(南京大学),江苏南京210023

出　　处：《高分子材料科学与工程》2022年第8期18-24,34,共8页Polymer Materials Science & Engineering

基　　金：中央高校基本科研业务费专项资金(020514380274)。

摘　　要：设计合成了一种环氧基超支化有机硅树脂(HPSi),将其与酚醛树脂按照不同比例进行混合改性。研究结果表明,固化后材料的耐烧蚀性能、力学性能及耐湿性有了明显提升,当HPSi的质量分数为酚醛树脂的20%时,800℃在空气及氮气中的残碳率分别为24.2%和65.1%,而原酚醛树脂仅为3.0%和61.9%;改性后冲击强度为4.88 kJ/m^(2)、吸水率为1.0%,分别提升了400%和52%。同时环氧基超支化有机硅树脂与酚醛树脂显示出良好的相容性,改性后的酚醛树脂的介电性能显著提高,该项工作有望在航空航天科学和工业领域实现新的应用。Epoxy hyperbranched silicone resin(HPSi)was synthesized and then incorporated into phenolic resin at different proportions.The results show that the ablation resistance,mechanical properties and moisture resistance of the cured materials are improved significantly.When the mass fraction of HPSi reaches 20%of phenolic resin,the carbon residue rates at 800℃under air and nitrogen are up to 24.2%and 65.1%,respectively,while those of the raw phenolic resin are only 3.0%and 61.9%.The impact strength and water absorption of the composite are also increased by 400%and 52%,reaching 4.88 kJ/m^(2) and 1.0%,respectively.Particularly,the epoxy hyperbranched silicone resin shows excellent the compatibility with phenolic resin.Besides,the modified phenolic resin exhibits the improved dielectricity compared to the unprocessed counterpart.This work paved a new avenue towards advanced materials in the field of aerospace science and industry.

关 键 词：超支化 有机硅树脂 酚醛树脂 航天工业 

分 类 号：TB332[一般工业技术—材料科学与工程]