THE DEVELOPMENT OF CULTURAL AND CREATIVE PRODUCTS BASED ON THE PERSPECTIVE OF LOW-CARBON ECOLOGY RENEWABLE ENVIRONMENTALLY FRIENDLY MATERIALS AS AN EXAMPLE

초록

Polylactic acid (PLA) is a type of bio-based, renewable, environmentally friendly plastic with good biodegradability, biocompatibility, mechanical strength and processing performance. It has broad application prospects in cultural and creative products, textiles and garments, and other fields. However, PLA has disadvantages such as poor toughness, poor heat resistance, and poor hydrolysis resistance, which limit its application. In this work, PLA was modified by melt blending with an epoxidized elastomer (EVM-GMA) and crystallization behaviour control. The PLA/EVM-GMA composite material was the end product, which exhibited excellent toughness and heat resistance. Studies showed that the EVM-g-PLA copolymer formed in situ during the melt blending of PLA and EVM-GMA has improved compatibility between PLA and EVM-GMA and significantly improved toughness of the PLLA/PDLA blend system. When the content of EVM-GMA was 20 wt%, the elongation at break and the notched impact strength of the PLLA/PDLA/EVM-GMA composites reached 48 % and 65.5 kJ/m(2), respectively, which was higher than that of PLLA/PDLA (50/50). The elongation and notched impact strength were increased by 15 times and 18 times, respectively. Since the two-step annealing treatment formed a high content of stereocomposite crystals, the PLLA/PDLA/EVM-GMA composite also exhibited excellent heat resistance (HDT > 140 degrees C), chemical resistance and hydrolysis resistance.

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