乙烯基酯低聚物增韧邻苯二甲酸二烯丙酯树脂的研究

Study on Diallyl Phthalate Resin Toughened by Vinyl Ester Oligomers

为了改善邻苯二甲酸二烯丙酯(DAP)树脂的韧性,采用两种相对分子质量不同的乙烯基酯低聚物(VEO1和VEO2)与DAP进行共混。测定了混合树脂的凝胶时间及固化物的不溶分数。采用力学性能测试、动态热力学、热失重等分析手段对固化物的力学性能及热性能进行了表征。结果表明,VEO1的加入量分别为5%和20%时,树脂的冲击强度分别提高了73%和120%,弯曲强度分别提高了24%和71%,同时热性能也得到了改善。高相对分子质量的VEO2对DAP的增韧更具有优势。冲击断面扫描电子显微镜分析表明,VEO的加入使断口形貌粗化,从而提高了树脂的冲击强度。

A vinyl ester oligomer （VEO1 or VEO2） was introduced into diallyl phthalate （DAP） resin as a toughener. The gel time of the mixed resin and the insoluble fraction of the cured sample were measured. The mechanic and thermal performances of cured samples were characterized by static mechanical testing, dynamic mechanic analysis （DMA）, and thermogravimetric analysis （TGA）. When the loadings of VEO1 were 5 % and 20 %, the impact strength of DAP increased by 73 % and 120 %, respectively, compared with neat one. Improvement in flexural strength and thermal properties were also observed. More effective toughening was resulted by VEO2 because of its higher molecular weight. The fractured surfaces of the samples were observed using scanning electron microscope.