Construction of high-performance and sustainable polylactic acid composites for 3D printing applications with plasticizer

Gaoyuan Ye; Xiaochun Zhang; Hongjie Bi

doi:10.1016/j.ijbiomac.2024.132162

Construction of high-performance and sustainable polylactic acid composites for 3D printing applications with plasticizer

Int J Biol Macromol. 2024 May 7;269(Pt 2):132162. doi: 10.1016/j.ijbiomac.2024.132162. Online ahead of print.

Authors

Gaoyuan Ye¹, Xiaochun Zhang², Hongjie Bi³

Affiliations

¹ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China.
² College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China. Electronic address: 20110039@zafu.edu.cn.
³ College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou 311300, China. Electronic address: hjbi@zafu.edu.cn.

PMID: 38723825
DOI: 10.1016/j.ijbiomac.2024.132162

Abstract

Polylactic acid (PLA) attains much attention because of its biodegradability, biocompatibility, and high strength, but its further application was remarkably hindered by its brittleness. In order to improve the toughness of PLA, a biodegradable composite was prepared by blending ductile polycaprolactone (PCL), stiff microcrystalline cellulose (MCC), and green plasticizer tributyl citrate (TBC) with PLA by melting extrusion. The physicochemical properties and microstructure of PLA composites were thoroughly investigated using FTIR, TGA, DSC, XRD, melting rheology, optical transmittance, 3d printing, tensile tests, and SEM. The tensile tests results show that introduction of TBC exhibited a remarkable improvement effect in the elongation at break of PLA/PCL/MCC (PPM) composite, increasing from 2.9 % of PPM to up to 30 % of PPM/6TBC and PPM/8TBC. Noticeably, the strength of PPM/TBC composites (at least 33.1 MPa) was enhanced compared with that of PPM (28.2 MPa). The plasticization of TBC, enhancing the compatibility of composites, and reinforcing effect of MCC were identified as pivotal factors in toughening and reinforcing PLA. Furthermore, it is observed that the incorporation of TBC contributed to enhanced thermal stability, crystallinity, and rheology property of composites. This research supplies a novel approach to bolstering the toughness of PLA and broaden its potential applications.

Keywords: Mechanical properties; Microcrystalline cellulose; Polylactic acid.