＜正＞ A series of polyurethane based on liquid chloroprene-hydroxyethyl methacrylate copolymer（CP-co-HEMA）-polystyrene （PS） interpenetrating polymer networks （PU-PS IPN） were synthe-sized. Some physical properties were examined and density behavior was investigated. In 60%polyurethane （PU） system, the tensile strength and density increased greatly. Transmission electronmicrographs showed that the phase separation existed and the sizes of PS domains dispersed in PUphase were about 500-4,000 A. In comparison with correlative PU-PMMA IPN system, whichhas the higher compatibility, this system showed an extensive phase separation and clear boundaries.There was no phase inversion observed even for 60% PU system in which PS was still the dispersed phaseand PU the continuous phase. This was due to the relatively faster rate of formation of PU than thatof ST polymerization.
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