Fabrication and the barrier characterization of the cellulose nanofibers/organic montmorillonite/poly lactic acid nanocomposites
Fabrication and the barrier characterization of the cellulose nanofibers/organic montmorillonite/poly lactic acid nanocomposites
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DOI：
10.1002/app.51827
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发表时间：
2021-11
影响因子：
3
通讯作者：
Yuan Li;Lu Zhang;Fa-yong Li;Ke Wang;Xiaoru Wu;Hailu Liu;Bibo Long;Yang Zhao;D. Xie;Junjia Chen
中科院分区：
文献类型：
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作者：
Yuan Li;Lu Zhang;Fa-yong Li;Ke Wang;Xiaoru Wu;Hailu Liu;Bibo Long;Yang Zhao;D. Xie;Junjia Chen
以甲基丙烯酸甲酯（MMA）为单体，通过自由基聚合对纤维素纳米纤维（CNF）进行疏水改性，以提高CNF与聚乳酸（PLA）的相容性。随后将有机蒙脱土与基材结合制备新型纳米复合材料。然后使用铸涂工艺将所得纳米复合材料涂覆在纸张表面，以试图提高对水蒸气和氧气的阻隔性能。此外，复合膜是通过溶液流延法制备的。系统测量了所制备薄膜的水蒸气透过率（WVTR）、水蒸气透过率（WVP）、氧气透过率（OTR）和拉伸强度。相应的结果表明，随着涂料中添加一定含量的MCNF，WVTR、WVP和OTR降低。 0.2wt%MCNF为最佳含量，表现出最佳的耐气性和拉伸性能。添加0.2wt%MCNF的薄膜的WVTR和WVP最低值为10.30 g/(m2⋯24 h)和3306.58 g⋯μm/(m2⋯24 h)，比不含NFC的PLA复合薄膜降低了88.23%和26.05%。
The hydrophobic modification of cellulose nanofibers (CNF) was carried out via free radical polymerization using methyl methacrylate (MMA) as the monomer to improve the compatibility between CNF and poly lactic acid (PLA). Followed by the preparation of the novel nanocomposites in combination of the organic montmorillonite and the substrate. The resulting nanocomposites were then coated on paper surface using a cast‐coating process in an attempt to improve the barrier properties towards water vapor and oxygen. In addition, the composite films are prepared via a solution casting method. The water vapor transmission rate (WVTR), water vapor permeability (WVP), oxygen transmission rate (OTR), and tensile strength of the as‐prepared films were systematically measured. The corresponding results demonstrated that the WVTR, WVP and OTR decreased with the addition of a certain content of MCNF in coatings. 0.2 wt% MCNF is the optimum content, showing the best gas resistance and tensile performance. The lowest value of WVTR and WVP are 10.30 g/(m2⋯24 h) and 3306.58 g⋯μm/(m2⋯24 h) for films with 0.2 wt% MCNF added, which is 88.23% and 26.05% lower than that of PLA composite film without NFC.