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Block copolymers containing poly(tetramethylene oxide) and poly(methyl methacrylate) segments were prepared. A commercially available poly(tetramethylene oxide) terminated with tolylene diisocyanate was capped with tert ‐butyl hydroxymethyl peroxide and the resulting prepolymer peroxide was used as a free‐radical initiator of vinyl polymerization. Block copolymers formed in temperature‐programmed vinyl polymerizations possessed improved impact strengths over poly(methyl methacrylate) from 0.35 to 1.18 for a fixed (nonoptimized) block length of poly(tetramethylene oxide).
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Érdy et al. (1970) studied this question.
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