Improvement of Thermostability of Poly(lactic acid) by Radiation Crosslinking

- Aug 31, 2018-

Poly(lactic acid) (PLA) that originates from natural plants such as corn and potato is known as a carbon neutral material because it does not increase the amount of carbon dioxide in the air.


Although PLA has good biodegradability, biocompatibility, renewability and mechanical properties, the utilization of PLA materials are limited to the specified applications because the thermostability and workability of PLA is lower than them of commercial plastics.


In our group, for expanding the further versatility of PLA materials, we have been improving of thermostability of PLA. As a result, it was found that crosslinking agent triallyl isocianurate (TAIC) at 3% concentration was the most effective crosslinking agent for PLA by irradiation technique.


The crosslinking agent triallyl isocianurate (TAIC) that composed of three double bond sites (C=C) and a cyclic unit (isocyanuric ring) built a more stable three-dimensional network than other crosslinking agents. The radiation crosslinking of PLA was enhanced effectively by the addition of a few percentage of TAIC even at relatively low dose such as 50 kGy. Also, the PLA containig 3% TAIC possessed high thermostability and its shape hardly deformed at 200 degrees.