非茂钛配合物催化乙烯/α-烯烃共聚制备聚烯烃弹性体  

Polyolefin Elastomers Synthesized from Ethylene/α-Olefin Copolymerization Catalyzed with Non-Metallocene Titanium Catalyst

作　　者：任静[1] 王彬[1] 傅宏俊[2] 李悦生[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072 [2]天津工业大学纺织学院,天津300387

出　　处：《高分子材料科学与工程》2017年第4期1-6,共6页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点项目(21234006)

摘　　要：以(2,4-tBu_2-6-PPh_2-C_6H_2O)_2TiCl_2/MAO体系催化乙烯/α-烯烃(1-己烯、1-辛烯、1-癸烯)共聚,合成了一系列高相对分子质量聚烯烃弹性体。采用核磁共振、差示扫描量热分析、X射线衍射和材料拉伸试验等对共聚物的结构、热性质和力学性能进行了表征。共聚物的重均相对分子质量高于4.0×10~5,相对分子质量分布为2.00左右,共聚单体插入率在摩尔分数4.0%~10.1%可调。研究表明,随α-烯烃插入率的增加,共聚物的熔融温度和结晶度逐渐降低,断裂伸长率逐渐增大。当共聚单体摩尔分数达到4.0%时,共聚物在拉伸过程中没有明显的应变软化,并且伴随有应变硬化现象,进一步增加共聚单体含量,弹性回复率可高于80%。A series of polyolefin elastomers were prepared via copolymerization of ethylene with a-olefins including 1-hexene, 1-octene and 1-decene catalyzed with non-metallocene（2, 4-tBu2-6-PPh2-C6H20）2TiCI2/MAO catalytic system. The resultant copolyrners exhibit high molecular weight （Mw〉4.0 x 105） and unimodal distribution （Mw/ Mn=2.00）. The catalytic activity for the copolymerization is higher than 6830 kg/（molTi＂ h＂ MPa）. The incorporation of comonomer could be adjusted between 4.0 % - 10.1%. The thermal and mechanical properties of the copolymers were characterized by NMR, DSC, WAXD and tensile testing. With increases of the comonomer incorporation, the melting temperature and the crystallinity gradually decrease with increase of the incorporation of a- olefin, whereas the elongation at break increases. When the monomer incorporation reaches molar fraction 4.0 %, the strain-hardening phenomenon is observed without the typical strain softening, suggesting that the copolymers exhibit the mechanical properties of thermoplastic elastomers. The elastic recovery of polyolefin elastomers can easily surpass 80 %.

关 键 词：聚烯烃弹性体 烯烃共聚 非茂钛催化剂 弹性回复 

分 类 号：TQ334.2[化学工程—橡胶工业]