Preparation and Properties of Block-Graft Copolymers from Butyl Acrylate Macromer with Styrene by Iniferter Technique

Abstract

The St₂·McBA·St₁·McBA·St₂-type block-graft copolymers of butyl acrylate macromer (McBA) with styrene (St) were prepared by the photoiniferter technique. The microdomain structure of hot-pressed samples of the blockgraft copolymers was investigated in terms of dynamic viscoelastic properties, electron microscopy, and tensile strengths. The microdomain structure depended not only on the length of both St₁ and St₂ blocks but also on the molecular weight of the macromer. Thus, the St phase transformed from a continuous phase into a dispersed phase, and the BA phase similarly changed. It was found that the dynamic viscoelastic properties and the tensile strengths varied with those microdomain structures.