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The influence of plasticizer addition on behavior of highly crosslinked unsaturated polyester–styrene systems was investigated by measurement of their compression creep and creep recovery at different temperatures. The correction between the observed behavior of the investigated polymeric systems and their structures was explained by assuming the presence of supermolecular structures which change in the applied field of stress at different temperatures. In a wide temperature range the plasticiezr addition shows a similar effect to that of temperature increase on creep recovery of the investigated polymers.