this invention concerns the thermoplastic , biodegradable hydrogel copolymer which is easily degraded and excreted in human body by the hydrolysis of intramolecular ester and amide bond . the structure of present copolymer comprises i ) hydrophilic and swellable soft domain consisting of polyethyleneoxide , and ii ) hydrophobic , biodegradable , crystallizable and non - swellable hard domain consisting of polylactide , polyglycolide , polylactideglycolide and polycaprolactone .