摘要
Vistamaxx(VM)是一种新型的茂金属催化的丙烯-乙烯共聚物,其丙烯质量分数在70%以上,组成与结晶性介于无定型的乙丙橡胶与结晶性的聚丙烯之间,是一种柔软且有弹性的聚烯烃材料。对VM进行了红外光谱(FTIR)、广角X射线衍射(WAXD)、示差扫描量热(DSC)以及力学性能的测试分析,结果表明:VM中的乙烯质量分数在20%以下;VM的Tg在-24℃以下;VM的结晶度较低,其结晶具有聚丙烯α-型晶体结构特点,分子链中较短的链段可在室温以下结晶表现出二次结晶现象;VM是一种透明性高、力学性能优异的热塑性弹性体材料。
Vistamaxx （VM） is a novel metallocene-catalyzing polyolefin elastomer synthesized by propylene and ethylene comonomer, with a propylene content over 70mol%. The composition and cryslallinity of VM are intermediate between amorphous EPR and semicryslalline isotactic polypropylene. They are tough polyolefin with soft and elastic properties. FTIR, WAXD, DSC and mechanical test were used to characterize their properties. The results showed that：the ethylene mass content of VM is under 20%. The Tg of VM is below -24 ℃. VM has a lower crystallinity with a crystal structure similar to α polymorph of PP. The short sequences of propylene will crystallize at room temperature which shows a secondary crystallization. VM is a thermoplastic elastomer with high transparency and excellent mechanical properties.
出处
《弹性体》
CAS
2007年第4期9-12,共4页
China Elastomerics
基金
埃克森美孚化学公司横向合作项目
关键词
丙烯-乙烯共聚物
茂金属催化聚烯烃
弹性体
结晶性能
表征
propylene-ethylene copolymer
metallocene catalyst polyolefin
elastomer
crystallization
characterization
