摘要
茂金属聚烯烃以其高附加值而受到广泛重视．有关桥联或非桥联二茂基金属催化剂用于合成无规、等规、间规聚丙烯和聚丁烯－１已有报道［１～５］．Ｌｌｉｎａｓ等［６］用ｒａｃ－Ｅｔ（ＣｐＭｅ４Ｉｎｄ）·ＴｉＣｌ２和甲基铝氧烷（ＭＡＯ）催化剂合成了等规／无规立构嵌...
Butene was polymerized using novel mono ( η 5 pentamethylcyclopentadienyl) tribenzyloxy titanium Cp *Ti(OBz) 3 /modified methylaluminoxane(mMAO) as catalyst. The resulting multi stereoblock polybutene 1 was characterized by 13 C NMR and DSC analysis. The influences of various oxidation state of titanium active species on 1 butene polymerization were investigated. It was indicated that Ti(Ⅳ) active species is in favour of producing polybutene 1. 13 C NMR analyses of polymers obtained show that propagation of 1 butene involves primarily head to tail 1,2 insertions, with involving some head to head or tial to tail 2,1 misinsertions. There is a remarkable decrease in 2,1 misinsertions with decreasing temperature of polymerization. Regiopentad distribution indicates stereoblock polybutene 1 with melting temperature( T m) comprising isotactic, syndiotactic and atactic multi sequences polybutene 1.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第7期1156-1158,共3页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
