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6606869 
Journal Article 
MODIFICATION OF STYRENE-ISOPRENE BLOCK COPOLYMERS .3. ADDITION OF MALEIC-ANHYDRIDE MECHANISM 
Mitov, Z; Velichkova, R; , 
1993 
Yes 
European Polymer Journal
ISSN: 0014-3057 
PERGAMON-ELSEVIER SCIENCE LTD 
OXFORD 
29 
4 
597-601 
English 
WOS:A1993KP63300023 
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-1-NMR and C-13-NMR and i.r. spectra showed that the modification conducted at 70-degrees-C with alpha,alpha'-azoisobutyronitrile as initiator proceeds only as substitution at allylic positions.