摘要
采用 9,9 双 (甲氧基甲基 )芴 (BMMF)为内给电子体合成MgCl2 /TiCl4 /BMMF催化剂 ,以三乙基铝为助催化剂在无需外给电子体的情况下得到高等规度的聚丙烯 .该催化剂具有高活性和高立体定向性 ,并与以邻苯二甲酸二丁酯 (Phthalate)为内给电子体 ,二苯基二甲氧基硅 (DDS)为外给电子体合成的MgCl2 /TiCl4 /Phthalate AlEt3 /DDS催化剂的性能进行比较 ,结果表明无外给电子体催化剂具有较高的活性 ,且聚丙烯的等规度大于 95 % .研究了聚合温度 ,铝钛比等聚合条件对催化剂的活性 ,聚合物的分子量、等规度和熔点的影响 ,并用13 C
The catalyst MgCl2/TiCl4/BMMF-AlEt3 prepared with a novel complex 9, 9-bis (methoxymethyl) fluorene (BMMF) as internal donor was applied to propene polymerization without any external donors and the isotacticity of polypropene obtained was over 95%. In comparison with the catalyst MgCl72/TiCl4/Phthalate-AlEt3/DDS, the catalyst of MgCl2/TiCl4/BMMF-AlEt3 showed high activity. The effects of polymerization conditions such as temperature and Al: Ti ratio on the activity of catalyst, on the molecular weight, the isotaticity and the melting point of polypropene were studied. Polypropene was characterized by C-13-NMR spectroscopy and the structure of polypropene was studied.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2001年第2期191-194,共4页
Acta Polymerica Sinica
基金
国家重点基础研究发展规划项目! (G 19990 64 80 0 )
