Silylated Softwood and Hardwood Lignin: Impact on Thermomechanical and Interfacial Properties of PLA Biocomposites.

IF 5.4 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Biomacromolecules Pub Date : 2025-10-14 DOI:10.1021/acs.biomac.5c01179

Giulia Herbst, Gabriela Adriana Bastida, Quim Tarrés, Marcos Lúcio Corazza, Luiz Pereira Ramos, Marc Delgado-Aguilar

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引用次数: 0

Abstract

Achieving compatibility between biopolymers and natural fillers is a significant challenge in developing sustainable materials. PLA-lignin biocomposites frequently demonstrate poor interfacial adhesion, mostly due to polarity differences. Softwood (LS) and hardwood (LH) lignins vary in composition and reactivity, affecting PLA structure. This study evaluated the surface compatibilization of LS and LH through silylation at 1, 3, and 5 wt % using a GPS coupling agent. Silylation was validated by TGA, DSC (T_g increase of ∼3-7 °C), ash color, and EDX (increased silicon). FTIR assessed structural differences in lignins. Rheological tests and melt flow index indicated that unmodified lignin reduced PLA viscosity, while GPS-modified lignin increased it. DSC showed that LS enhanced crystallization more than LH, and GPS at 1 wt % promoted nucleation. Films containing LH at 10 and 1 wt % GPS exhibited improved mechanical properties. Barrier properties remained unchanged, though all films provided UV-blocking capability.

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硅化软木和硬木木质素：对聚乳酸生物复合材料热力学和界面性能的影响。

实现生物聚合物和天然填料之间的相容性是开发可持续材料的重大挑战。pla -木质素生物复合材料通常表现出较差的界面粘附性，主要是由于极性差异。软木（LS）和硬木（LH）木质素的组成和反应活性不同，影响聚乳酸的结构。本研究评估了GPS偶联剂在1、3和5 wt %的硅基化作用下LS和LH的表面相容性。通过TGA、DSC （Tg增加~ 3-7°C）、灰分色和EDX（硅增加）验证了硅基化。FTIR评估了木质素的结构差异。流变学测试和熔体流动指数表明，未经改性的木质素降低了聚乳酸的粘度，而经过gps改性的木质素增加了聚乳酸的粘度。DSC表明，LS比LH更能促进结晶，而1wt %的GPS能促进成核。含有10%和1wt % GPS LH的薄膜表现出更好的机械性能。尽管所有薄膜都具有阻挡紫外线的能力，但其阻挡性能保持不变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Biomacromolecules 化学-高分子科学

CiteScore

10.60

自引率

4.80%

发文量

417

审稿时长

1.6 months

期刊介绍： Biomacromolecules is a leading forum for the dissemination of cutting-edge research at the interface of polymer science and biology. Submissions to Biomacromolecules should contain strong elements of innovation in terms of macromolecular design, synthesis and characterization, or in the application of polymer materials to biology and medicine. Topics covered by Biomacromolecules include, but are not exclusively limited to: sustainable polymers, polymers based on natural and renewable resources, degradable polymers, polymer conjugates, polymeric drugs, polymers in biocatalysis, biomacromolecular assembly, biomimetic polymers, polymer-biomineral hybrids, biomimetic-polymer processing, polymer recycling, bioactive polymer surfaces, original polymer design for biomedical applications such as immunotherapy, drug delivery, gene delivery, antimicrobial applications, diagnostic imaging and biosensing, polymers in tissue engineering and regenerative medicine, polymeric scaffolds and hydrogels for cell culture and delivery.