PA11共混改性PLA可生物降解材料强韧化进展

生物基聚乳酸( PLA)是一种具有生物降解性和优异加工性的环境友好型塑料,具有广泛的应用前景。但是,由于 PLA 性脆韧性差,需要对 PLA 进行增韧改性。将其与柔性高分子材料共混,能够有效提高 PLA 材料的冲击强度和断裂伸长率,但同时也造成了 PLA 拉伸强度和模量大幅度下降。因此,采用高性能聚酰胺对 PLA 进行改性,得到的共混材料可以保持高韧性的同时具有较高的强度和模量。文章介绍了生物基聚酰胺 11( PA11)共混增韧 PLA 的研究成果。主要概述了通过加入无机粒子、催化剂、反应性增容剂达到细化分散相的尺寸。这些方法可以促使 2 种聚合物之间形成化学偶联提升、界面粘结的目的,从而改善 PA11 与 PLA 的界面相容性,最终实现 PLA 的增韧增强,制备可生物降解的高性能材料。

Progress in Strengthening and Toughening of Biodegradable Poly(Lactic Acid) by Blending with PA11

Bio-based poly(lactic acid)(PLA) is an environmentally friendly polymer material with biodegradability and excellent processability. However,it is necessary to toughen and modify PLA because of the poor brittle toughness of PLA. The impact strength and elongation at break of PLA can be effectively improved by blending with flexible polymer materials, but this could cause a significant decrease in modulus and tensile strength. Therefore,the high-performance polyamide is used to modify the PLA,and the blend material obtained can maintain high toughness while having high strength and modulus. The research results of PLA toughening modification by blending with bio-based polyamide 11 (PA11) were introduced. The main overview of the article is to refine the size of the disperse phase by adding inorganic particles,catalysts and reactive compatibilizers. These methods could promote chemical coupling between the two polymers to increase the interfacial adhesion and achieve the toughening and reinforcement of PLA to obtain biodegradable high-performance materials.