College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.
Henan Normal University, XinXiang 453007, China.
Phys Chem Chem Phys. 2023 Jul 12;25(27):17737-17758. doi: 10.1039/d3cp01003a.
Over the past three decades, its excellent biodegradability and biocompatibility have enabled poly(lactide) (PLA) to be extensively explored as a replacement for oil-based thermoplastics in biomedical and industrial applications. However, PLA homopolymers have "facilitative" limitations such as low mechanical properties, low processing temperatures, slow recrystallization, and insufficient crystallinity, which have usually hindered commercial PLA in industrial and biomedical applications. The formation of stereo-complexation between enantiomeric poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA) chains offers an effective approach to PLA-based engineering materials with improved properties. In this review, we have understandably summarized recent progress in improving the SC crystallization of PLA-based plastics into two aspects, , enantiomeric PLA homopolymers, and enantiomeric PLA-based copolymers. One important point to be noted is that much emphasis is focused on improving SC crystallization by enhancing interactions in the enantiomeric PLA-based copolymers. There is an insightful discussion about the effect of enhanced SC crystallization as well as intermolecular interactions between PLLA and PDLA chains in various stereocomplexable systems. Most importantly, this review starts with the basic understanding of SC crystallization and further elaborates on the rational mechanism of enhanced SC crystallization to provide a broad idea for broadening the road toward PLA-based materials.
在过去的三十年中，聚乳酸（PLA）具有优异的生物降解性和生物相容性，被广泛探索作为生物医学和工业应用中基于石油的热塑性塑料的替代品。然而，PLA 均聚物具有“促进”限制，例如低机械性能、低加工温度、缓慢的再结晶和不足的结晶度，这通常阻碍了商业 PLA 在工业和生物医学应用中的应用。手性聚（L-丙交酯）（PLLA）和聚（D-丙交酯）（PDLA）链之间形成立构络合物为改善性能的基于 PLA 的工程材料提供了一种有效的方法。在这篇综述中，我们合理地总结了提高 PLA 基塑料 SC 结晶的最新进展，分为两个方面：手性 PLA 均聚物和手性 PLA 基共聚物。需要注意的一点是，人们非常重视通过增强手性 PLA 基共聚物中的相互作用来提高 SC 结晶。本文深入讨论了在各种立构复合体系中增强 SC 结晶以及 PLLA 和 PDLA 链之间的分子间相互作用的效果。最重要的是，本综述从 SC 结晶的基本理解开始，进一步阐述了增强 SC 结晶的合理机制，为拓宽 PLA 基材料的道路提供了广泛的思路。
