Application of GPC in the Study of Stereospecific Block Copolymers
作者:
R.D. Mate,
M.R. Ambler,
期刊:
Separation Science
(Taylor Available online 1971)
卷期:
Volume 6,
issue 1
页码: 139-152
ISSN:0037-2366
年代: 1971
DOI:10.1080/00372367108055556
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Three different techniques involved in the preparation of Stereospecific block copolymers were studied using gel permeation chromatography (GPC). These techniques involved the use of a monofunctional organo-lithium catalyst, a difunctional organolithium catalyst, and a combination of a monofunctional organolithium catalyst and a coupling technique. GPC curves were obtained on the block copolymers using two different column sequences and solvents. The ABA block copolymers studied contained styrene, vinyl toluene, or α-methyl styrene as thermoplastic monomers and butadiene as the elastomeric monomer. The results obtained showed that block copolymers prepared using monomers and catalyst systems free of impurities generally exhibited single peaked GPC curves. In systems where impurities were found to be present, small amounts of A block homopolymer and AB block copolymer were formed. In such cases, the GPC curves were observed to have two or three peaks.
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