Premium
Homopolymerization and Copolymerization of Isoprene and Styrene with a Neodymium Catalyst Using an Alkylmagnesium Cocatalyst
Author(s) -
Zhang Qisheng,
Ni Xufeng,
Zhang Yifeng,
Shen Zhiquan
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20011201)22:18<1493::aid-marc1493>3.0.co;2-9
Subject(s) - comonomer , copolymer , isoprene , styrene , monomer , polymer chemistry , toluene , reactivity (psychology) , gel permeation chromatography , chemistry , neodymium , catalysis , polymerization , materials science , organic chemistry , polymer , medicine , laser , physics , alternative medicine , pathology , optics
The catalyst system Nd(acac) 3 ·2 H 2 O/Bu 2 Mg/CHCl 3 shows a fairly high activity in both the homo‐ and copolymerization of isoprene (IP) and styrene (St) in toluene at 60°C. Copolymers obtained from various comonomer feed ratios were characterized by means of NMR spectroscopy and gel‐permeation chromatography. The polyisoprene and poly(IP‐ co ‐St) obtained predominantly consist of cis‐1,4 IP units. Monomer reactivity ratios were evaluated to be r IP = 5.4 and r St = 0.38 in the copolymerization.