Stiffness-ductility balanced, high-barrier and UV-resistant biaxially drawn PLA/PPC/lignin films through orientation of matrix nanocrystals and layered dispersed phases

被引：0

作者：

Wu, Li ^{[1
]}

Niu, Deyu ^{[1
]}

Liu, Bo ^{[1
]}

Xu, Pengwu ^{[1
]}

Zhang, Xu ^{[1
]}

Yang, Weijun ^{[1
]}

Liu, Tianxi ^{[1
]}

Ma, Piming ^{[1
]}

机构：

[1] Jiangnan Univ, Key Lab Synthet & Biol Colloids, Minist Educ, 1800 Lihu Rd, Wuxi 214122, Peoples R China

来源：

POLYMER | 2025年 / 323卷

基金：

中国国家自然科学基金;

关键词：

Polylactic acid; Lignin; Biaxial oriented; Mechanical properties; Barrier properties; CRYSTALLIZATION; TOUGHNESS;

D O I：

10.1016/j.polymer.2025.128220

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The inherent brittleness, poor barrier properties, and susceptibility to UV degradation of polylactic acid (PLA) severely limit its practical applications. In this work, an effective high-performance modification strategy is developed to prepare PLA/poly(propylene carbonate)(PPC)/acetylated lignin (ACEL) films with superior comprehensive properties by using PPC and ACEL as functional toughening components through melt blending and biaxial drawing process. The introduction of the flexible PPC enhances the ductility, while the crystallization and orientation of the PLA matrix induced by biaxial drawing markedly improve mechanical strength of the films. Importantly, the oriented nanocrystals and PPC layered structure induced by biaxial drawing extend the gas permeation path and time, enhancing the barrier properties. The improved UV shielding and UV aging resistance are attributed to the incorporation of ACEL nanoparticles. Consequently, the biaxially oriented PLA/ PPC/ACEL films exhibit exceptional properties, including a strength of 107 MPa, ductility of 37 %, and oxygen permeability of 0.13 x 10-13 cm3 cm/cm2 & sdot;s & sdot;Pa, surpassing those of neat PLA. Meanwhile, the film retains a strength of 83 MPa after 96 h of UV aging, with significantly higher retention compared to PLA. Therefore, this work presents an economical and efficient approach for producing PLA-based films with outstanding comprehensive properties, offering promising potential for sustainable packaging applications.

引用

页数：10