Abstract: AB crosslinked polymers (ABCP) were synthesized from low molecular weight vinyl-terminated polyurethane prepolymers and vinyl monomers such as styrene,methyl methacry-late, vinyl acetate, etc. ABCPs displayed a two-phased morphology with plastic compo-nents forming the continuous phase and PU-rich domains forming separation phase on theelectron micrographs. The irregular shapes and a highly polydisperse distribution of PU-rich domain size were observed. These morphological features of ABCPs were quite diffe-rent from linear AB and ABA block copolymers owing to the crosslinking between compo-ments A and B in ABCPs.The crosslinking density of ABCPs ahd molecular weight of pre-polymers showed a notable effect on the compatibility of two components and the mopho-1ogy of ABCPs as well.

Key words: AB crosslinked polymers, Thermosetting polymer, Morphology, Polyurethane