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Synthesis and some solution properties of block copolymer styrene acrylonitrile

V. Chrástová, D. Mikulášová, P. Citovický, and J. Schenkmayer

Department of Chemical Technology of Plastics and Fibres, Slovak Technical University, CS-812 37 Bratislava

 

Abstract: Styrene—acrylonitrile block copolymers were synthesized by emulsion polymerization at 30 °C, in which peroxide of powdered isotactic polypropylene as a heterogeneous initiator, disodium salt of ethylenediaminetetraacetic acid as an activator, and Slovasol 2430 as a nonionic emulsifier were used. For the preparation of the block copolymer one of the characteristic properties of the mentioned polymerization system, i.e. the existence of long-living polystyrene radical in emulsion was evaluated. After removing of the initiator the first monomer — styrene was polymerized up to a certain conversion and then acrylonitrile was added to the growing polystyrene radicals. A block copolymer was formed, which contained a pure polystyrene block and an acrylonitrile sequence with fragments of styrene. The obtained copolymers with various styrene—acrylonitrile ratio were characterized by IR spectroscopy. By means of viscometry and light scattering some of their properties in methyl ethyl ketone and N,N-dimethylformamide were stud- ied.

Full paper in Portable Document Format: 422a235.pdf

 

Chemical Papers 42 (2) 235–242 (1988)

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