高强度柔性木材膜的制备与性能
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1.南京林业大学材料科学与工程学院;2.南京林业大学轻工与食品学院

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国家自然科学基金资助项目(31901254);第14批中国博士后科学基金特别资助(2021T140329);中国博士后科学基金面上项目(2020M671506);江苏省博士后科研资助计划(2020Z027)


Preparation of High-Strength Flexible Wood Membranes
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    摘要:

    以轻木为原料,通过脱基质处理结合表面改性工艺(2,2,6,6-四甲基哌啶氮氧化物TEMPO氧化和乙酰化),制备获得了一系列高强度柔性木材膜,并系统地研究了不同处理方法对木材膜力学性能、光学性能、宏/微观形貌、表面特性及结晶结构等的影响。结果表明,脱基质处理后所得木材纤维骨架在干燥过程中能够形成具有致密层状结构的木材膜试样,其密度提高了近5倍。进一步TEMPO氧化及乙酰化处理后,木材膜试样的透光性及力学性能均有显著提升。其中,TEMPO木材膜透光率近61.8%,断裂拉伸强度为180.29 MPa;而乙酰化木材膜断裂拉伸强度达264.14 MPa,几乎是轻木的14倍;并进一步作为柔性基材,制备获得了一种智能防伪标签。研究结果可为促进木材的高值化利用提供理论依据与技术支持。

    Abstract:

    A series of high-strength wood membranes were prepared by removing matrix from balsa wood first, and then applying 2,2,6,6-tetramethylpiperidinooxy (TEMPO) oxidation and acetylation on the cellulosic wood skeletons. The effects of above chemical treatments on mechanical properties, optical performance, morphology, surface characteristics and crystalline structure of the wood membranes were investigated systematically. The results show that after removing matrix, the obtained cellulosic wood skeletons could be converted into a dense wood membrane with layer structures under drying conditions. The density of this wood membrane is almost five times higher than that of the original wood. Further, TEMPO oxidation and acetylation treatments on cellulosic wood skeleton contribute to significantly improved optical and mechanical properties for the wood membranes. For example, the TEMPO oxidized wood membrane shows a light transmittance as high as 61.8% and fracture tensile stress of 180.29 MPa. For acetylated wood membrane, it has an excellent tensile strength of 264.14 MPa, which is almost 14 times higher than the original balsa wood. This acetylated wood membrane is further utilized as flexible substrate to develop an intelligent anti-counterfeiting label. Generally, these research results can provide theoretical basis and technical support for the promotion of high-value utilization of wood resources.

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  • 收稿日期:2021-08-20
  • 最后修改日期:2021-11-01
  • 录用日期:2022-03-25
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