Abstract: Small amount of lubricant in polyurethane elastomer can notably lmprove physical properties, such as hardness, tensile strength, wear and tear etc.The antiplastication effect can be explained in terms of reduced movement resistance of soft and hard segments, better microphase separation.The reactive lubricant molecular jointing to polyurethane molecular exhibited a better antiplastication effect than inert lubricant which takes a free state.This result can be explained in terms of lubricant-polyurethane thermodynamical non-miscibility,so inert lubricant may be repelled from the system whlle the liquid rubber is solidifying, in contrast to the reactive lubricant can form a stable lubricantion in phases boundary layers.

Key words: Lubricant, Polyurethane elastomer, Antiplastic effect, Microphase separation