present invention provides medical material sterilized by radioisotope , comprising polymer composite using in living body , containing multifunctional triazine compounds at weight ratio range of 0 . 01 to 20 weight percent to the polymer . the present invention shows the fabrication of polymer composite having good heat and radiation resistance , by preventing heat molding record and irradiation on sterilized processes from deteriorating molecular weight caused on heat and radiation decomposition of the polymer . it is possible that the polymer composite is applied for the medical field of decomposable and bio - absorbable polymers and even bio - nonabsorbent polymers such as suture of operation or bonding agent for broken bone as a result . furthermore , it is possible that the polymer composite is applied for not only medical material but also food wrapping material of industrial use .