增容剂对PP/PA共混体系动态力学性能的影响(英文)  

Influence of Compatibilizer on the Dynamic Mechanical Behavior of PP/PA Blends

作　　者：施绍裘[1] 王永忠[1] 王礼立[1] 欧玉春[2] 方晓萍[2] 

机构地区：[1]宁波大学工学院力学与材料科学研究中心,浙江宁波315211 [2]中国科学院化学研究所,北京100080

出　　处：《宁波大学学报（理工版）》2003年第4期388-392,共5页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：The financial support from the National Natural Science Foundation of China(Project:10032010,10372046);The Natural Science Foundation of Zhejiang Province(Project:501014)

摘　　要：采用2种不同的增容剂对PP/PA共混体系进行增容:PP与马来酸酐的接枝共聚物PP-g-MAH和接枝改性的热塑性弹性体TPE-g.并对它们应变率从10-4 s-1到103 s-1范围内的力学性能进行了研究.试验结果表明:采用PP-g-MAH作增容剂的PP/PA两元体系,在高应变率冲击条件下,界面损伤演化加速,应变约6％时即发生宏观应力应变曲线软化,应变率约2 000 s-1,应变约23％时即发生剪切破坏.采用TPE-g界面相容剂的PP/PA两元体系,由于形成分散相为核,界面相客荆为柔性壳的核壳结构,在尼龙粒子及壳层的协同作用下,使该共混体系的韧性得到大幅度提高.该体系在应变率高于3 500 s-1,应变约45％时才发生剪切破坏.断裂时单位体积吸收能量大幅度提高.Two different kinds of compatibilizers were used for PP/PA polymer blends: polypropylene grafted with maleic anhydride (PP-g-MAH) and thermoplastic elastomer grafted with maleic anhydride (TPE-g) . The dynamic mechanical behavior of these two binary polymer blends at strain rate ranging from 1×10-4-1×103s-1 was studied. The experimental results show that at high strain rate for PP/PA/ PP-g-MAH the damage evolution process of interface between the minor disperse phase and the matrix was accelerated. When its strain reaches about 6% , the stress softening of its stress strain curve is observed. Its shearing failure happens at strain about 23% under the strain rate of 2 000 s-1. For PP/PA/ TPE-g situation, the compatibilizer TPE-g forms a soft shell around a small core of the second minor phase PA. Under the synergetic action of the fining PA particles and the flexible shell, the toughness of the binary blends with core-shell structure is enhanced obviously. Its shearing failure strain is increased as high as to 45 % under the strain rate 3 500 s - and its absorbed fracture energy for unit volume is raised remarkably.

关 键 词：PP/PA共混体系 共混高聚物 增容剂 动态力学性能 热塑性弹性体 应变率 剪切破坏 

分 类 号：TQ325[化学工程—合成树脂塑料工业] TQ314.24