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Modification of styrene-isoprene block copolymers—3. Addition of maleic anhydride—mechanism

✍ Scribed by Z. Mitov; R. Velichkova

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
299 KB
Volume
29
Category
Article
ISSN
0014-3057

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✦ Synopsis

Al~tract--The mechanism and site of addition of maleic anhydride to styrene-isoprene block copolymers have been investigated. Conditions have been found for modification of the olefinic unsaturation up to 15-20% without crosslinking. ~H-NMR and ~C-NMR and i.r. spectra showed that the modification conducted at 70°C with a,~t'-azoisobutyronitrile as initiator proceeds only as substitution at allylic positions.

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