反应性挤出制备PP-St-MAH共混物及其结晶性能  

Preparation of PP-St-MAH Blend via Reactive Extrusion and It's Crystallization

作　　者：周安[1] 吴盾[1] 曹峥[1] 刘钢[1] 刘春林[1] Zhou An;Wu Dun;Cao Zheng;Liu Gang;Liu Chunlin(School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164

出　　处：《工程塑料应用》2017年第5期101-107,125,共8页Engineering Plastics Application

基　　金：江苏省政策引导类计划(产学研合作)前瞻性联合研究项目(BY2015027-21)

摘　　要：通过双螺杆挤出机对聚丙烯(PP)、马来酸酐(MAH)和苯乙烯(St)进行反应性挤出制备聚丙烯-苯乙烯-马来酸酐(PP-St-MAH)共混物。用傅立叶红外光谱仪、旋转流变仪研究St用量对PP-St-MAH共混物接枝率和复数黏度的影响。结果表明,St的加入使1 780 cm-1与840 cm-1处峰的面积比(吸光比)由0.88上升至3.94,表明MAH的接枝率提高,同时体系黏度增大,说明St抑制了PP的自由基降解。采用差示扫描量热仪分析不同降温速率和St用量下PP-St-MAH共混物的非等温结晶过程。分别采用Jeziorny法、Ozawa法和莫志深法进行数据处理,发现Jeziorny法和莫志深法都适合分析其非等温结晶动力学,而Ozawa法的结果线性关系不明显,不适合分析PP-StMAH共混物的动力学。随着St用量增加,采用Jeziorny法得到的Avrami指数、结晶速率参数总体呈上升趋势,表明St的引入在一定程度上产生异相成核效果,改变了PP-St-MAH共混物的结晶方式,结晶方式从一维向二维、三维转变,同时加快结晶速率。莫志深法的结果也支持此结论。Polypropylene-styrene-maleic anhydride(PP-St-MAH)blend was prepared by reactive extrusion with maleic anhydride(MAH),styrene(St)and polypropylene(PP)as raw materials.The effects of St content on the grafting rate and viscosity of PP-St-MAH blend were studied by Fourier transform infrared spectrometer and rotary rheometer.The results show that the addition of St rises the area ratio(absorption ratio)of peaks at1780cm-1and840cm-1from0.88to3.94,indicating that the grafting ratio of MAH increases.Besides,the complex viscosities of sample increase,showing that St inhibites the free radical degradation of PP.The non-isothermal crystallization of PP-St-MAH blend was investigated by differential scanning calorimetry at different cooling rates and St contents.Jeziorny,Ozawa and Mozhishen methods were used to analyze the crystallization kinetics.The linearity of Ozawa method is not obvious and it is not suitable for analyzing the kinetics of PP-St-MAH blend while the others were suitable.The Avrami index and crystallization parameter obtained by Jeziorny method increases,showing that the adding St,to a certain extent,produce heterogeneous nucleation effect,which indicates transformation of crystallization from one-dimensional to two-dimensional and three-dimensional and rises of crystallization rate.Simultaneously,the results of Mo Zhishen also support this view.

关 键 词：聚丙烯-苯乙烯-马来酸酐共混物 非等温结晶动力学 结晶性能 

分 类 号：TQ322.2[化学工程—合成树脂塑料工业]