新型CNBR/PP全交联型热塑性弹性体的制备与形态、结构及性能研究

Preparation, Morphology, Structure Characterization and Properties of Novel CNBR/PP Fully Cross-linked Thermoplastic Elastomers

将具有纳米尺度的全交联型羧基丁腈粉末橡胶 ( CNBR)与聚丙烯 ( PP)及用甲基丙烯酸环氧丙酯( GMA)官能化的聚丙烯 ( PP-g-GMA)进行反应共混 ,制备了一种新型 CNBR/PP热塑性弹性体 .用原子力显微镜 ( AFM)和透射电子显微镜 ( TEM)研究了 CNBR/PP热塑性弹性体的形态 ,加入 PP-g-GMA增容剂后 ,CNBR分散相的粒子尺寸显著降低 ,分布也趋于均一 .与未增容体系相比 ,增容体系的拉伸强度和断裂伸长率均有大幅度的改善 ,如 CNBR含量为 75 %时 ,拉伸强度提高了 94% ,断裂伸长率增加了 1 3 6% .用差示扫描量热法 ( DSC)研究了热塑性弹性体中聚丙烯的结晶行为 ,在增容体系中 ,共混前后聚丙烯的结晶温度提高了 1 0℃ ,表明橡胶粒子或两相界面处形成的反应产物起到了类似成核剂的作用 .

A novel CNBR/PP thermoplastic elastomer was prepared by using reactive blending method. Here, a plain PP and a fully cross-linked acrylonitrile-butadiene rubber powders(CNBR) with nanometer dimension and carboxylic end-groups were used as the blending components. And a polypropylene functionalized with glycidyl methacrylate(PP-g-GMA) was used as a compatibilizer. Their morphologies were examined by using AFM and TEM. It was found that the size of CNBR dispersed phase of the compatibilized blending system was much smaller and its distribution was much more homogeneous than that of the related uncompatibilized blends. Comparing with the uncompatibilized blends, mechanical properties of compatibilized blends were obviously improved at the same compositions. The DSC data indicated that the crystallization temperature of PP in compatibilized blends increased about 10 ℃. It could be tentatively explained as that the dispersed CNBR particles or the reactive product formed on the interface of two phase acted as a kind of nucleating agent.