Premium
A novel catalytic system—NdCl 3 · HMPA/AI(i‐6u) 3 for copolymerization of isoprene and styrene
Author(s) -
Xu XiaoMing,
Ni XuFeng,
Shen ZhiQuan
Publication year - 2004
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20040220730
Subject(s) - copolymer , chemistry , styrene , isoprene , polymerization , catalysis , monomer , polymer chemistry , molar ratio , amide , gel permeation chromatography , lanthanide , nuclear chemistry , anhydrous , organic chemistry , polymer , ion
Co polymerization of styrene (St) and isoprene (IP) was carried out with a catalyst system composed of anhydrous lanthanide chloride hexamethyl phosphor amide complex (LnC1 3 ‐HMPA) and aluminum organic compound (AOC). Among the catalysts examined, catalyst NdC1 3 *HMPA/Al(i‐Bu) 3 showed a high activity in the copolymerization under certain conditions giving copolymers (5%‐158 St content) with high cis ‐1, 4 microstructure in IP Units (>95%). The effects of HMPA/Nd molar ratio, Al/Nd molar ratio, monomer/Nd molar ratio, St feed ratio, and the reaction time on copolymerization were examined with this catalytic system. The obtained copolymers were characterized by 1 H and 13 C NMR spectroscopies and gel‐permeation chromatography (GPC).