采用强韧性聚合物聚苯醚(PPO)对环氧-聚砜(PSF)二元共混物进行共混增韧改性,发现一定配比的实验性三元共混胶粘剂,在保持二元体系剪切强度、耐热性、耐湿热老化性的同时,可使-55～175℃的剥离强度提高15%以上,楔子试验初始裂纹长度缩短5mm,裂纹扩展速率有较大程度降低.本体应力-应变试验发现,断裂应力提高30%,断裂伸长率提高33%,断裂能提高82%.根据一系列试验分析推断,该三元共混物是物理共混,且环氧树脂与双氰胺发生交联反应生成三维网络结构,环氧、聚砜,聚苯醚部分互容,分子链相互纠缠和贯穿,同时聚苯醚、聚砜本身又是强韧性树脂,因而使三元共混物成为具有互贯网络结构的宏观均相而微观非均相的增韧体系.

The introduction of PPO into Epon/Dicy-PSF system with Epon/Dicy-PSF-PPO being a certain ratio can increase the peel strength within the temperature range of-55—175℃ by 15%,and decrease the initial crack length in wedge test by 5mm and the crack growth rate to a great extent while keeping its shear sterngth,temperature resistance and hydro-thermal aging resistance the same as those of adhesive SY-14,the results of stress-strain test show that the fracture stress increasds by 30%,the elongation to break 33% and fracture energy 82%,In thesystem only chemical reaction between Epon and Dicy takes place,there by a three dimensional network is formed.While Epon,PSF and PPO are partly compatible and their molecular chains diffuse and get cntargled with each oth-er.Further more,PPO,PSF are of high tensile strength and good toughness,thus a macrohomoganeous but microheterogeneous IPN polyblend system is formed,the toughening mechanism of the system is explored briefly.