β成核剂对抗冲聚丙烯共聚物的结晶和力学性能研究  

The Study of β Form Nucleator on Crystallization and Mechanical Properties of Impact Co-polypropylene

作　　者：张超灿[1] 徐光[1] 吴力立[1] 张藕生[1] 

机构地区：[1]武汉理工大学材料学院,武汉430070

出　　处：《塑料助剂》2008年第3期31-35,共5页Plastics Additives

基　　金：湖北省科技攻关重大项目(20061g0042)

摘　　要：分别用α晶型成核剂和β晶型成核剂对抗冲聚丙烯共聚物(iPP)的结晶和力学性能进行研究,并用偏光显微镜(POM)、广角X射线衍射仪(WAXD)和差示扫描量热仪(DSC)对其进行了详细的表征。结果表明,α和β成核剂使iPP的起始结晶温度(ton)提高15.3℃和12.7℃,结晶峰温度(tp)提高17℃和13.7℃,结晶速率加快。两种成核剂都能使球晶细化,使结晶更加均匀化、规整化,从而使结晶度增加。α成核剂(TMA-3)使iPP的拉伸强度、冲击强度和断裂伸长率分别提高到23.43MPa、22.27kJ/m2和788%;β成核剂因主要是改变球晶的形态,形成与α球晶完全不同的β晶型,使iPP的拉伸强度、冲击强度和断裂伸长率的提高比α成核剂显著,分别达到24MPa、32.81kJ/m2和861%。The influence of α form and β form nucleators on crystallization and mechanical properties of impact co-polypropylene （iPP） was studied and they were investigated by polarized optical microscopy （POM）, differential scanning calorimetry （DSC） and wide angle X-ray diffraction （WAXD）. The results show that both α and β form nucleators improve beginning crystallization temperature to 15.3 ℃ and 12.7 ℃, and crystallization peak temperature to 17 ℃ and 13.7 ℃, and quicken crystallization rate of iPP. Two kinds of nucleators all can increase crystallization degree of iPP by reducing, minishing and regulating crystallization form; ot form nucleator （TMA-3） increases tensile strength, impact strength and elongation at break of iPP to 23.43 MPa, 22.27 kJ/m^2 and 788% respectively; however, in contrast, and β form nucleator mainly changes crystallization configuration and more evidently increases tensile strength, impact strength and elongation at break of iPP than a form nucleator, which were achived to 24 MPa, 32.81 kJ/m： and 861% respectively.

关 键 词：聚丙烯共聚物 成核剂 结晶 力学性能 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业] TF777[冶金工程—钢铁冶金]