The complete stereocomplexes without single crystals were obtained from a commercial grade Poly(L-lactide) (PLLA) and the sufficient low molecular weight poly (D-lactide) (PDLA). These poly(lactide) (PLA) stereocomplex were crosslinked with triallyl isocyanurate (TAIC) by electron beam irradiation for improving their heat stability and different crosslinked samples were characterized. The organogels were formed in the irradiated stereocomplexes because of the crosslinking between the polymer chains and the crosslinker. The results indicated that 30 kGy is an optimum radiation dose for introducing the stable crosslinking network into PLA stereocomplexes. The PLLA/PDLA(3) stereocomplex (L/D-3) crosslinked with 3% TAIC at 30 kGy revealed the highest thermal stability. Alkaline hydrolysis and enzymatic degradation of the stereocomplex were controlled by radiation crosslinking because the alkaline solution as well as proteinase K hardly absorbed or attacked to the crosslinking network of polymer chains. POLYM. ENG. SCI., 49:970-976, 2009. (C) 2009 Society of Plastics Engineers