Department of Food Engineering and Bionanocomposite Research Institute, Mokpo National University, 61 Dorimri, Chungkyemyon, Muangun, 534-729 Jeonnam, Republic of Korea.
Department of Food Engineering and Bionanocomposite Research Institute, Mokpo National University, 61 Dorimri, Chungkyemyon, Muangun, 534-729 Jeonnam, Republic of Korea.
Carbohydr Polym. 2015;127:101-9. doi: 10.1016/j.carbpol.2015.03.073. Epub 2015 Mar 30.
Crystalline cellulose nanofibril (CNF) was isolated from cotton linter pulp using an acid hydrolysis method and used as a filler to reinforce sodium carboxymethyl cellulose (CMC) film. The CNF was in rod shape with the diameter of 23-38 nm and the length of 125-217 nm and crystallinity index (CI) was 0.89. The effect of CNF concentration (1, 3, 5, and 10 wt% based on CMC) on the optical, morphological, mechanical, water vapor barrier, surface hydrophobicity, and thermal properties of the nanocomposites were studied. The CNF was evenly distributed in the polymer matrix to form smooth and flexible films indicating the CNF is highly compatible with the CMC. The tensile strength (TS) and elastic modulus (EM) of CMC film increased by 23% and 27%, respectively, while the elongation (E) decreased by 28% with 5 wt% of CNF inclusion. The WVP of CMC film decreased at low content of CNF, and increased with increase in CNF content, then decreased but to the same level of the control CMC film with the inclusion of 10 wt% of CNF. Transparency of CMC film decreased slightly from 87.7% to 86.2% with 5 wt% of CNF. The CMC/CNF composite films have a high potential to be used as an edible coating or packaging films for the extension of shelf life of fresh and minimally processed fruits and vegetables.
微晶纤维素纳米纤维（CNF）是通过酸水解法从棉绒浆中分离出来的，用作增强羧甲基纤维素（CMC）膜的填料。CNF 呈棒状，直径为 23-38nm，长度为 125-217nm，结晶度指数（CI）为 0.89。研究了 CNF 浓度（基于 CMC 的 1、3、5 和 10wt%）对纳米复合材料的光学、形态、机械、水蒸气阻隔、表面疏水性和热性能的影响。CNF 均匀分布在聚合物基体中，形成光滑柔韧的薄膜，表明 CNF 与 CMC 高度相容。加入 5wt%的 CNF 后，CMC 膜的拉伸强度（TS）和弹性模量（EM）分别提高了 23%和 27%，而伸长率（E）降低了 28%。在 CNF 含量较低时，CMC 膜的水蒸气透过率（WVP）降低，随着 CNF 含量的增加而增加，然后随着 CNF 含量的增加而降低，但与添加 10wt%的 CNF 的对照 CMC 膜的水平相同。当加入 5wt%的 CNF 时，CMC 膜的透光率从 87.7%略有下降至 86.2%。CMC/CNF 复合膜具有作为可食用涂层或包装膜的潜力，可延长新鲜和轻度加工水果和蔬菜的保质期。
