Firstly, biodegradable crosslinking agent having a poly(ethylene glycol)(PEG) central block, extended with poly(D,L-lactide) and terminated with diacrylate, was prepared. Then, PLA-HEMA macromonomer(MC) with the functional end double bond was synthesized by bulk ring-opening polymerization of D,L-lactide(D,L-LA) using stannous 2-ethyl hexanoate(Sn(Oct)_2) as a catalyst, and 2-hydroxyethyl methacrylate(HEMA) as a co-initiator. Lastly, the novel biodegradable crosslinked copolymers were synthesized by the...