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研究了物理老化对聚苯基单醚喹啉薄膜的结构与力学性能的影响 .用差示扫描量热计 (DSC)及正电子湮没寿命谱 (PALS)方法表征了两种不同物理老化条件试样的凝聚结构以及自由体积的差别 .结果表明 ,物理老化使聚苯基单醚喹啉薄膜玻璃化转变温度移向高温 ,在其末端出现热焓吸收峰 ,分子链堆砌紧密使自由体积减小 ,分子可动性降低 .用动态力学分析 (DMTA)以及静态拉伸性能测试等方法研究了两类试样的力学性能 ,结果表明 ,物理老化后 ,试样的动态储能模量稍有增加 ,力学损耗降低 .而静态拉伸实验的断裂应变降低 ,屈服应力增加 ,断裂能降低 ,试样在宏观上由韧性断裂变为明显的脆性断裂 .
The effects of physical aging on the structure and mechanical properties of poly (phenylene ether monoether) quinoline films were investigated by means of differential scanning calorimeter (DSC) and positron annihilation lifetime spectroscopy (PALS). Two different physical aging conditions The results showed that physical aging changed the glass transition temperature of poly (phenylene ether) quinoline film to high temperature, and the enthalpy absorption peak appeared at the end of the film. Decrease and decrease of molecular mobility.The mechanical properties of two kinds of samples were studied by dynamic mechanical analysis (DMTA) and static tensile test, and the results show that after physical aging, the dynamic storage modulus And the mechanical loss decreased.While the tensile strain of static tensile test decreased, the yield stress increased, the fracture energy decreased, the sample changed from ductile fracture to obvious brittle fracture macroscopically.