茂钛催化剂聚1-丁烯的合成

茂金属催化烯烃聚合以其高活性、定向性等特点受到广泛重视.Ｋａｍｉｎｓｋｙ1～4]等用二茂基(Ｃｐ、Ｉｎｄ和Ｆｌｕ)过渡金属(Ｔｉ、Ｚｒ和Ｈｆ)化合物/ＭＡＯ催化剂催化1丁烯聚合,可得到间规(ｓＰＢ)、无规(ａＰＢ)或等规(ｉＰＢ)聚1丁烯.Ｌｉｎ5]和Ｗｕ6]分别用单茂基的ＣｐＴｉ(ＯＰｒ)3/ＭＡＯ和ＣｐＴｉ(ＯＢｚ)3/ＭＡＯ催化剂进行丙烯聚合,都得到无规聚丙烯(ａＰＰ),并研究了催化体系中Ｔｉ氧化态分布,认为Ｔｉ+4有利于α烯烃聚合.有关用单茂钛化合物/ＭＡＯ催化体系催化1丁烯聚合的研究目前较少文献报道.本文用新型茂钛催化剂—…

SYNTHESIS OF 1-POLYBUTENE WITH TITANOCENE CATALYST

A novel poly(1\|butene) was synthesized with η 5 \|pentamethylcyclopentadienyl\|tribenzyloxytitanium(Cp\+*Ti(OBz)\-3) and modified methylaluminoxane(MAO). The influence of various conditions (e.g., catalyst composition, temperature, Al/Ti, pressure of monomer, and catalyst concentration) on the catalytic activity, molecular weight of the products were investigated in detail. It was found that the catalyst exhibited highest activity of 91 3kgPB/molTi·h at \%T\%=30℃, and Al/Ti(mol/mol)=200. The catalytic activity and molecular weight were sensitive to the TMA content in MAO and external TIBA. Catalytiac activity and molecular weight were decreased with increasing the content of TMA in MAO.External addition of TIBA can deactivated the catalyst. Molecular weight of the products was increased with decreasing temperature and Ti concentration. The catalyst had the highest activity at a Ti concentration of 1 0×10 -3 mol/L. The molecular weight of poly(1\|butene) is high, over one million by GPC method. The results showed that with this catalyst system, a high molecular weight poly(1\|butene) can be synthesized.