Tailoring bionanocomposite film functionality using cellulose nanofibrils and bioactive wood extractives

IF 4.8 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD

Cellulose Pub Date : 2025-08-26 DOI:10.1007/s10570-025-06727-0

Urša Osolnik, Viljem Vek, Miha Humar, Primož Oven, Ida Poljanšek

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引用次数: 0

Abstract

The aim of the study was to produce biologically active biocomposite films with improved mechanical properties compared to pure poly(vinyl alcohol) (PVA) film. In a first step, two-component films were produced, namely PVA with the addition of nanocellulose. Unmodified cellulose nanofibrils (CNFs), TEMPO cellulose nanofibrils (TCNFs), and lignocellulose nanofibrils (LCNFs) were used as reinforcement, and the performance of these nanofillers with respect to the properties of PVA-based biocomposites was compared. All nanofillers improved the mechanical properties of PVA, with TCNFs providing the greatest reinforcement. The PVA biocomposite with 6% TCNF showed a 55% higher modulus of elasticity and 58% higher tensile strength than the reference film. The most thermally stable bionanocomposite among the PVA-nanocellulose biocomposites was PVA with 6% CNF; thermal degradation (T_onset) started at a temperature 4 °C higher than the reference. In order to achieve antibacterial activity of the produced three-component films, a hydrophilic extract of silver fir knotwood was added to the PVA/nanocellulose system. In addition to the antibacterial properties, the effects of the hydrophilic extract on the mechanical and thermal properties of the three-component films were also investigated. The extract led to a shift in the T_onset towards higher temperatures, with the higher content having an even greater effect. The addition of 4% extract to the LCNF-reinforced biocomposite increased the tensile strength by 10% compared to the PVA-LCNF biocomposite.

Graphical abstract

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使用纤维素纳米纤维和生物活性木材提取物裁剪生物纳米复合膜的功能

该研究的目的是生产具有生物活性的生物复合薄膜，与纯聚乙烯醇（PVA）薄膜相比，其机械性能有所改善。在第一步，生产双组分薄膜，即添加纳米纤维素的聚乙烯醇。采用未改性的纤维素纳米原纤维（CNFs）、TEMPO纤维素纳米原纤维（TCNFs）和木质纤维素纳米原纤维（LCNFs）作为增强剂，比较了这些纳米填料的性能与pva基生物复合材料的性能。所有的纳米填料都改善了PVA的力学性能，其中TCNFs提供了最大的增强。与参考膜相比，含6% TCNF的PVA生物复合材料的弹性模量提高了55%，拉伸强度提高了58%。PVA-纳米纤维素生物复合材料中热稳定性最好的是PVA + 6% CNF；热降解（Tonset）在比参考温度高4°C时开始。为了使制备的三组分膜具有抗菌活性，在聚乙烯醇/纳米纤维素体系中加入了一种亲水性的银杉节木提取物。除了抗菌性能外，还研究了亲水性萃取物对三组分薄膜力学性能和热性能的影响。萃取物导致了Tonset向更高温度的转变，更高的含量具有更大的效果。与PVA-LCNF生物复合材料相比，添加4%提取物的lcnf增强生物复合材料的抗拉强度提高了10%。图形抽象

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.