聚乳酸立构复合物的研究最新进展与应用展望

Recent Research Progress and Application Prospect of Poly(lactic acid) Stereocomplex

立构复合型聚乳酸(SC-PLA)由于聚左旋乳酸(PLLA)与聚右旋乳酸(PDLA)分子链之间强烈的相互作用,可以使熔点提高约50℃,改善了聚乳酸在耐热性上的不足,同时这种立构复合结构使聚乳酸的力学性能、结晶性能、耐水解性等也得到提升。立构复合型聚乳酸的合成新进展主要集中在嵌段型SC-PLA的制备,同时广泛采用X射线衍射技术、核磁共振、光谱分析、表观形貌等技术来探索聚乳酸立构复合结构的形成机制。本文对近年来新型SC-PLA的制备、SC-PLA的性能表征和应用方面的研究进展进行了综述。

The melt point of PLA can be increased by nearly 50℃ because of the particular strong intermolecular interaction between poly（L-lactic acid） and poly（D-lactic acid） chains in stereoeomplex structure. The special stereocomplex structure improves the heat resistance of PLA, as well as the mechanical properties, crystallinity and hydrolysis resistance. Recently, more and more attention has been paid to the preparation of novel stereocomplex, especially the stereocomplexation between PLA block eopolymers. And the mechanism of formation of stereocomplex structure has been studied by X- ray scattering, nuclear magnetic resonance, spectroscopy, surface morphology, etc. In this paper, the current research in preparation of novel stereocomplex, properties and characterization of SC-PLA and application prospect are reviewed.