超支化环氧树脂增韧增强苯并噁嗪树脂

Simultaneously Toughening and Reinforcing Modification of Benzoxazineresin with Hyperbranched Epoxy

将芳香二元胺型苯并噁嗪(DDM)与全脂肪链超支化环氧树脂(AHEP)按照不同配比进行共混固化,制备出完全相容的DDM/AHEP共混固化物。用傅里叶变换红外光谱和差示扫描量热仪研究了共固化体系的固化物结构特征及其固化反应行为。使用动态热机械性能分析仪表征了共固化体系固化物的热机械性能,结果表明,共混固化物的冲击强度和弯曲模量协同增韧增强。当AHEP添加量为5%(质量分数)时DDM/AHEP固化物的弯曲模量比纯苯并噁嗪树脂提高了11.5%,冲击强度则提高了167%。共混固化物的断面形貌,呈现出原位增韧增强的特征。

Fullycompatibleblend cured resins DDM/AHEP were prepared by incorporating different among of aliphaticand epoxide-functional hyperbranched polymer （AHEP） into an aromatic-diamine type- benzoxazine（DDM） network without cure-induced phase separation. Then their structure and thermo-mechanical property were investigated by means of FTIR,DSC and DMA. The results show that the Young＇s modulus and impact toughness of DDM could be simultaneously enhanced by the incorporating AHEP. Flexural strength and impact strength of the cured DDM/AHEP blend approach a maximum for5% incorporationof AHEP, representing an increase of over 11.5% and 167% respectively in comparison to that of the original DDM. The fracture surface morphology of the cured blend has the characteristic of in-situ toughness enhancement.