Internal Olefinic Multivinyl Crosslinkers. 1.

Free-Radical Crosslinking Copolymerizations of (Meth) acrylic Monomers with Liquid Diene Rubbers as Nonconjugated Polyene Oligomers

Abstract

Diene rubber is regarded as internal olefinic multiallyl monomers linked allyl groups (-CH=CR-CH₂- : R = H or CH₃) with methylene units (-CH₂-) and thus, liquid diene rubbers such as liquid polybutadiene rubber (LBR) and liquid polyisoprene rubber (LIR) as nonconjugated polyene oligomers are called as “internal olefinic multivinyl crosslinkers”. So this work is concerned with the free-radical crosslinking copolymerizations of (meth) acrylic monomers with LBR and LIR in order to examine the role of “internal olefinic multivinyl crosslinker” as an extension of our continuing studies concerned with the mechanistic discussion of network formation in the free-radical crosslinking polymerization and copolymerization of multivinyl monomers. The present discussion was focused on the elucidation of the competitive occurrence of both addition reaction to internal double bonds and abstraction reaction of allylic hydrogens in LBR and LIR by growing polymer radical.