Department of Plant & Environmental New Resources, Graduate School of Biotechnology, Institute of Life Sciences and Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, South Korea.
Department of Plant & Environmental New Resources, Graduate School of Biotechnology, Institute of Life Sciences and Resources, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 446-701, South Korea.
J Hazard Mater. 2020 Nov 5;398:123100. doi: 10.1016/j.jhazmat.2020.123100. Epub 2020 Jun 4.
High performance biopolymer films are of great interest as effective alternatives to non-biodegradable and petroleum-based polymer films. However, most natural biopolymer films possess weak mechanical and poor gas barrier properties, limiting their applicability. In this work, we developed all-cellulose nanocomposite films through a simple vacuum filtration process, using cellulose nanocrystals (CNCs) and 2,2,6,6-tetramethylpiperidine-1-oxy-oxidized cellulose nanofibers (TEMPO-CNFs). The TEMPO-CNFs were employed to construct a transparent, free-standing substrate matrix and the CNCs were used as a coating material to improve the mechanical and water vapor barrier properties of the final material. We have demonstrated that the top and bottom CNCs-coated TEMPO-CNF substrates (CNC/TEMPO-CNF/CNC) have excellent mechanical and good water vapor barrier properties. The resulting CNC/TEMPO-CNF/CNC films revealed a high tensile strength of 114 MPa and a low specific water vapor transmission rate (SWVTR) of 19 g∙mm/m∙day. In addition, the CNC/TEMPO-CNF/CNC films were resistant to various solvents including water, ethanol, tetrahydrofuran (THF), and acetone. This type of high performance cellulose nanocomposite can be used as a renewable material for a broad range of potential applications.
高性能生物聚合物膜作为一种有效的替代品，可替代不可生物降解和石油基聚合物膜，受到了广泛关注。然而，大多数天然生物聚合物膜的机械性能较弱，气体阻隔性能较差，限制了其应用。在这项工作中，我们通过简单的真空过滤工艺，使用纤维素纳米晶体（CNCs）和 2,2,6,6-四甲基哌啶-1-氧基氧化纤维素纳米纤维（TEMPO-CNFs）开发了全纤维素纳米复合材料膜。TEMPO-CNF 用于构建透明、自立的基质，而 CNC 则用作涂层材料，以提高最终材料的机械性能和水蒸气阻隔性能。我们已经证明，顶部和底部涂覆 CNC 的 TEMPO-CNF 基底（CNC/TEMPO-CNF/CNC）具有出色的机械性能和良好的水蒸气阻隔性能。所得的 CNC/TEMPO-CNF/CNC 薄膜具有 114 MPa 的高拉伸强度和 19 g·mm/m·day 的低特定水蒸气透过率（SWVTR）。此外，CNC/TEMPO-CNF/CNC 薄膜可耐受包括水、乙醇、四氢呋喃（THF）和丙酮在内的各种溶剂。这种高性能纤维素纳米复合材料可用作可再生材料，具有广泛的潜在应用。
