Preparation and Performance Research of Bio-based High Toughness Polylactic Acid Composites

Abstract The work aims to prepare the polylactic acid composites with high toughness by adding polybutylene succinate (PBS) with good toughening performance and acetyl tributyl citrate (ATBC) as an interface phase solvent and diisopropylbenzene peroxide (DCP) as a compatibilizer and polyamide compounds (TMC) as a nucleating agent. The bio-based polylactic acid composites are prepared by melt blending. The toughening agent and the effects of phase solvents and compatibilizers on the mechanical performances and transparency of PLA blends were studied. The research focused on investigating the effects of the toughening agent, compatibilizer, and interfacial compatibilizer on the mechanical performances and transparency of the PLA blends, with the aim of developing a high-toughness PLA preparation technology. The results indicated that when 0.4-0.6%. TMC was added to the PLA material, the crystallinity reached 32.7%, and the light transmittance exceeded 92%. Evidently, TMC can promote PLA nucleation and accelerate resin crystallization. The optimal mass ratio of each component in the PLA/PBS/ATBC/TMC/DCP blend was 80:20:10:0.4:0.3, resulting in a breaking elongation of 416.5%, which is 71 times higher than that of pure PLA, impact strength of 4.22 kJ/m 2 , an increase of 165% compared to pure PLA, a tensile strength of 44.3 MPa, and a light transmittance of 82%. Clearly, the compatibility of the PLA/PBS blend is optimal, with significant toughening and transparency enhancement, broadening its application in the field of transparent products.