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Modification of styrene-isoprene copolymers—1. End-terminated products

✍ Scribed by Z.G. Mitov; R.S. Velichkova

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
381 KB
Volume
28
Category
Article
ISSN
0014-3057

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✦ Synopsis

A~tract--Functionalization of various types of mono-and a, to-bifunctional copolymers was achieved by termination with carbon dioxide, the potassium salt of chloracetic acid, maleic anhydride, carbon disulphide or ethylene oxide. The functionality was determined on the basis of -g/'n (GPC and VPO) and the concentration of the end-groups obtained from ~H-NMR and i.r. spectra. The experimental conditions for quantitative carbonation and hydroxylation without side reactions were established.

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AIWI"~'t--A kinetic study of the addition of maleic anhydride to styrene--isoprene block copolymers at 60, 70 and 80 ° in the presence of Gt,a'-azoisobutyronitdle has been made using i.r. spectroscopy. The reaction is first order with respect to maleic anhydride. The order with respect to at,~t'-azo