两种类型成核剂对聚丙烯结晶行为及力学性能的影响  

Effects of α and β Nucleating Agent on Crystallization Behavior and Mechanical Properties of Polypropylene

作　　者：刘晓霞[1] 李永红[1] 张普玉[1] 

机构地区：[1]河南大学精细化学与工程研究所,河南开封475001

出　　处：《信阳师范学院学报（自然科学版）》2006年第2期223-225,共3页Journal of Xinyang Normal University(Natural Science Edition)

基　　金：河南省科技攻关项目(0524270016)

摘　　要：用差示扫描量热仪和X射线衍射仪对两种类型成核剂改性的聚丙烯的结晶行为进行了表征,结果表明,两种成核剂的加入均可提高聚丙烯的结晶起始温度和结晶峰温度,并加快结晶速度.α成核剂的加入使聚丙烯结晶度增大,从而使刚性增加,但抗冲击强度有所下降;β成核剂的加入使聚丙烯中β晶含量大幅度地提高,从而使聚丙烯抗冲击强度提高,即韧性增加.The nucleating effects of α and β nucleating agent on the crystallization behavior of polypropylene （PP） were studied by differential scanning calorimetry（DSC） and X-ray diffraction spectrum（XRD）. The results shows that the addition of nucleating agents increased the onset temperature and peak temperature and improved crystaUization rate of PP. With the addition of α nucleating agent, the crystallinity increased, resulted in higher rigidity and lower impact strength than those of pure PP; while with the addition of β-nucleating agent, the relative content of β crystalline form of special sheaf-like structure increased and resulted in increase of impact strength and the toughness.

关 键 词：聚丙烯 成核剂 α晶型 Β晶型 

分 类 号：TQ314.24[化学工程—高聚物工业]