关键词: 聚乳酸, 生物降解, 共混改性

Abstract: Research and development of biodegradable materials is one of the effective approaches to solving the environmental pollution problems which come from the traditional petroleum-based plastics. Polylactic acid (PLA) has so many good properties such as full biodegradability，good thermal processibility，renewablility，high mechanical performance and so on. It is an inevitable trend to replace the petroleum-based plastics. However，the properties of hydrophobicity，poor toughness and high price are obstacles for the application of PLA. All of these result in attracting much attention in the research of modification of PLA. In this paper，the recent research on biodegradable PLA system including blending with natural polymer and synthetic polymer is summarized. The effect of processing technology，surface treatment and additives on the composite material is presented. Further research could be flexible polymer，surfactant，and various fibers to improve the brittleness，compatibility，and strength of the cromposite material.

Key words: polylactic acid, biodegradable, blending modification