Abstract: The effects of composition, crosslink density of COPU/PMMA AB crosslinked polymerson their mechanical, dynamic mechanical properties, compatibility an d morphology werestudied.The results show that increasing the content of hard segment and decreasing cros-slink density make the compatibility of the polymer worse.TEM shows that the COPU/PMMA AB crosslinked polymer systems transform from apparent compatible to semi-compatibleone with the increase of hard segment content,and the phase inversion occurs when PMMA content reaches to 50%.The damping value is controlled mainly by the crosslink density,whereas the T_g value by the component.

Key words: AB crosslinked polymer, castor oil, MMA, toluene disocyanate, mechanical property