The effect of polymerization conditions on crystalline of polybutene-1 catalyzed by metallocene catalyst

Polybutene-1 was synthesized stereoselectively with the precursor η(5)-(pentamethyl-cyclopentadienyl) tribenzyloxide titanium (Cp*Ti(OBz)3) and methylaluminoxane (MAO). The effects of polymerization conditions, trimethyl alumina (TMA) content in MAO and temperature on the crystalline and molecular weight of the products, and catalytic activity were investigated. The structural properties of the polybutene-1 were characterized with (13)C NMR and WAXD.

新型单茂钛/改性甲基铝氧烷催化剂合成立构多嵌段聚丁烯-1

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...

茂金属催化剂催化1-己烯齐聚反应的研究

以茂金属配合物双(四甲基环戊二烯基)二氯化锆为主催化剂,1-己烯为反应物,甲基铝氧烷(MAO)为助催化剂,考察了反应条件对茂金属催化剂催化1-己烯齐聚反应活性的影响。结果表明,茂金属催化剂1-己烯齐聚反应活性和产物收率均随反应温度的升高和反应体系中铝锆比(Al/Zr)的增加而增加。通过降低反应体系中1-己烯的加入量可以使1-己烯齐聚反应在较低的Al/Zr(200∶1)和较低的反应温度(40℃)下具有较高的齐聚反应活性和产物收率。茂金属催化剂双(四甲基环戊二烯基)二氯化锆具有较高的1-己烯齐聚反应活性,其反应活性可达106g/[mol(Zr)·h]以上。