摘要
将活性开环易位聚合得到的聚降冰片烯所带的茂钛取代环丁烷末端基转变成烷氧基茂钛，然后在ＡｌＥｔＣｌ２助催剂存在下催化乙烯与丙烯配位共聚合，合成出聚降冰片烯聚（乙烯ｃｏ丙烯）两嵌段共聚物．考察了铝钛比、聚合温度和单体配比对乙丙共聚合的影响，并通过溶剂萃取及１３ＣＮＭＲ分析对聚合产物进行表征．结果表明约３６％的活性聚降冰片烯有效地转换并在助催剂ＡｌＥｔＣｌ２存在下使乙丙共聚合形成嵌段共聚物．
A change of polymerization mechanism from living ring opening metathesis polymerization of norbornene into coordination copolymerization of ethylene and propylene by converting the titanacyclobutane attached to a polynorbornene chain into titanocene alkoxide was used to the synthesis of polynorbornene poly(ethylene co propylene) block copolymers The effects of polymerization temperature, c (Al)/ c (Ti) ratio and monomer feed ratio on the ethylene propylene copolymerization have been studied and the polymerization products were characterized with solvent extraction and 13 C NMR spectra The results showed that about 36% of the living polynorbornene can be effectively converted to polymerizing the olefins in the presence of AlEtCl 2 cocatalyst, to form block copolymer The amount of the ethylene propylene copolymers connected with polynorbornene segments in the form of diblock copolymer increases with lowering c (Al)/ c (Ti) ratio and polymerization temperature and increasing ethylene content in the monomer feed
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第3期38-42,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金
广东省自然科学基金
关键词
配位聚合
嵌段共聚物
降冰片烯
乙烯
丙烯
ring opening metathesis polymerization
coordination polymerization
copolymerization
block copolymer
norbornene
ethylene
propylene
