Adhesive-free direct coating of wood and nonwood materials with biomass films produced via reassembling of lignocellulose

IF 7.3 2区 材料科学 Q1 CHEMISTRY, APPLIED
Naoko Kobayashi , Tomohiro Hashizume , Takashi Watanabe
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Abstract

Petroleum-derived polymers, which are commonly coated on wood for surface decoration and protection, result in a high load on the carbon balance on Earth and exhibit difficulties related to material recycling. Herein, biomass films were prepared via the disintegration and reassembly of plant cell wall components using formic acid under ultra mild conditions (<50 °C). These films were tightly coated on 30 types of hardwood and softwood offcuts by heat-pressing without synthetic polymers and adhesives. They were also coated on ceramic, glass, plastic, and metal plates. Scanning electron microscopy and water-contact-angle analysis of Eucalyptus globulus and a Japanese cedar film coated above 200 °C revealed a rough surface with fibril bundle structures and an increase in the hydrophobicity from 66° to >90° after film coating. Thermogravimetry–differential thermal analysis coupled with mass spectrometry revealed that heat-pressing caused water evaporation, dehydration, and pyrolytic degradation of the films, along with release of the degraded products, mainly derived from xylan. Pyrolytic degradation induced penetration of the melted film components into the porous structures of the involved wood, affording a tight coating with increased hydrophobicity. Overall, this process enables hydrophobic coatings solely made from woody biomass. (190 words).

Abstract Image

用木质纤维素重组而成的生物质薄膜直接涂覆木材和非木材材料的无粘合剂涂料
石油衍生聚合物通常涂在木材上用于表面装饰和保护,导致地球碳平衡的高负荷,并表现出与材料回收有关的困难。在超温和条件下(<50°C),利用甲酸对植物细胞壁组分进行分解和重组,制备生物质膜。这些薄膜在没有合成聚合物和粘合剂的情况下,通过热压紧密地涂在30种硬木和软木边材上。它们也被涂在陶瓷、玻璃、塑料和金属板上。在200°C以上涂覆桉树和杉木膜,扫描电镜和水接触角分析表明,涂覆后的桉树和杉木膜表面粗糙,具有纤维束结构,疏水性从66°增加到90°。热重-差热分析结合质谱分析表明,热压引起了膜的水分蒸发、脱水和热解降解,并释放了降解产物,主要来源于木聚糖。热解降解诱导熔化的膜组分渗透到相关木材的多孔结构中,提供具有增加疏水性的致密涂层。总的来说,这个过程使疏水涂层完全由木质生物质制成。(190字)。
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来源期刊
Progress in Organic Coatings
Progress in Organic Coatings 工程技术-材料科学:膜
CiteScore
11.40
自引率
15.20%
发文量
577
审稿时长
48 days
期刊介绍: The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.
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