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 co
Modification of styrene-isoprene block copolymers—5. Grafting
✍ Scribed by Z. Mitov; R. Velichkova; T. Zlatkov
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 392 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0014-3057
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Al~tract--Two series of well characterized styrene-isoprene two-block copolymers have been synthesized, with weight fractions 50 and 75 per cent styrene. Their intrinsic viscosities have been studied in a number of solvents and over a wide range of molecular weights. In general the intrinsic viscosi
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
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) a