Abstract
The process of the in situ formation of a linear poly(methyl methacrylate)-crosslinked polyurethane blend in the presence of different amounts of an oligomeric azo initiator containing fragments of a polyurethane chain and groups capable of initiating the radical polymerization of methyl methacrylate has been studied. It has been shown that the use of an azo initiator providing for the formation of block copolymers retards the phase separation in the system and favors the formation of a finer blend structure that is characteristic by a domain size several times smaller than that of the pristine blend, without the azo initiator. The optimum azo initiator concentration that results in a better dispersion of polyurethane in poly(methyl methacrylate) has been determined.
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