Poly(styrene-b-isobutylene-b-styrene) Block Copolymers Produced by Living Cationic Polymerization - I. Compositional Analysis
Document Type
Article
Publication Date
5-1-1999
Department
Polymers and High Performance Materials
Abstract
Poly(styrene-b-isobutylene-b-styrene) block copolymers made through controlled-living cationic polymerization using the Bu-t-m-DCC-TiCl4 initiating system in 60/40 (v/v) hexane-methyl chloride cosolvents were analyzed using curve-resolution software in conjunction with high-resolution g.p.c. Fractional precipitation and selective solvent extraction were applied to a representative sample in order to confirm the identity of contaminating species. The block copolymers were found to consist of 70-75 wt% of the target molecule, and about 20 wt% of coupled (and higher Linked) block copolymers formed by intermolecular electrophilic aromatic substitution linking reactions occurring during the styrene polymerization. Minor contaminants were identified as diblock copolymer and low molecular weight polystyrene homopolymer. (C) 1999 Elsevier Science Ltd. All rights reserved.
Publication Title
Polymer
Volume
40
Issue
11
First Page
3083
Last Page
3090
Recommended Citation
Storey, R. F.,
Baugh, D.,
Choate, K.
(1999). Poly(styrene-b-isobutylene-b-styrene) Block Copolymers Produced by Living Cationic Polymerization - I. Compositional Analysis. Polymer, 40(11), 3083-3090.
Available at: https://aquila.usm.edu/fac_pubs/4551