稀土催化齐聚α-烯烃的研究

研究了三氯化镱分别和AlEt_3,AlEt_2Cl以及AlEtCl_2组成的催化体系催化烯烃齐聚反应。三氯化镱和三乙基铝组成的催化体系能齐聚和聚合乙烯,但活性较低。三氯化镱和一氯二乙基铝组成的催化体系能有效地齐聚乙烯,得到C_4-CD_8烯烃含量达到99％,且线性率高。二氯乙基铝是三种烷基铝中最有效的助催化剂,它和三氯化镱组成的体系催化乙烯齐聚的活性在80℃,Al/Yb=40的反应条件下可达3400molC_2H_4/mol Yb·h;此催化体系还能催化齐聚丙烯、丁烯-1及己烯-1。初步研究了稀土化合物的配体及不同稀土元素化合物对催化反应的影响。

Synthesis and Characterization of Poly(isoprene-b-butyl methacrylate) Block Copolymer in the Presence of Rare Earth Catalyst

Poly(isoprene-b-butyl methacrylate) block copolymer with a high molecular weight was synthesized in the presence of rare earth coordination catalyst [RE(P 204 ) 3-Al( i Bu) 3 DBE]. The block copolymer was characterized by means of GPC,IR,DSC,NMR and elemental analysis. The block copolymer prepared has two glass transition temperatures: -75 6 ℃ and 32 2 ℃. The microstructure of the diblock copolymer possessed 96 8% cis 1,4 addition for the isoprene segment and a 70% syndiotacticity for the butyl methacrylate segment.