Common modification methods of polylactic acid
Polylactic acid (PLA) is a polymer polymerized with lactic acid produced by biological fermentation as the main raw material. There are two preparation methods: lactide ring opening polymerization and direct polycondensation. Among them, lactide ring opening polymerization is the most widely used method in industry. PLA has sufficient raw materials and can be regenerated. The production process is pollution-free, and the products can be biodegraded. When the temperature is higher than 55 ° C or the oxygen is enriched and the microbial action is reduced, it can be decomposed into carbon dioxide and water, so as to realize the material circulation in the nature and have no impact on the environment.
PLA is an early developed commercial biodegradable material with high strength and modulus, but its brittleness, toughness and heat resistance are poor, which greatly limits its application. Therefore, at present, the modification of PLA mainly focuses on heat resistance and toughening.
08-22 / 2022