Improvement of polyvinyl alcohol properties by adding nanocrystalline cellulose isolated from banana pseudostems
Improvement of polyvinyl alcohol properties by adding nanocrystalline cellulose isolated from banana pseudostems
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DOI：
10.1016/j.carbpol.2014.05.090
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发表时间：
2014-11-04
影响因子：
11.2
通讯作者：
Rosa, Morsyleide de F.
中科院分区：
文献类型：
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作者：
Pereira, Andre Luis S.;do Nascirnento, Diego M.;Rosa, Morsyleide de F.
从Pacovan品种的香蕉假骨纤维（BPF）分离的纤维素纳米晶（CNC）被用作聚乙烯醇（PVOH）基质中的填充剂，以产生纳米复合材料。在酸性条件下（H2SO4 62％w/w，70分钟，45度C），将BPF外部分数的纤维漂白并水解，以获得长度（L）135.0 +//- 12.0 nm和A的CNC直径（d）为7.2 +/- 1.9 nm，得出21.2的纵横比（L/d）。 CNC以不同的浓度（0％，1％，3％和5％w/w，干燥基础）应用于PVOH膜。随着CNC浓度较高，膜的水蒸气屏障增加，而光学性质的变化很小。将CNC的浓度提高到3％，可显着提高纳米复合材料的机械性能。 （c）2014 Elsevier Ltd.保留所有权利。
Cellulose nanocrystals (CNCs) isolated from banana pseudostems fibers (BPF) of the Pacovan variety were used as fillers in a polyvinyl alcohol (PVOH) matrix to yield a nanocomposite. The fibers from the external fractions of the BPF were alkaline bleached and hydrolyzed under acidic conditions (H2SO4 62% w/w, 70 min, 45 degrees C) to obtain CNCs with a length (L) of 135.0 +/- 12.0 nm and a diameter (D) of 7.2 +/- 1.9 nm to yield an aspect ratio (L/D) of 21.2. The CNCs were applied to PVOH films at different concentrations (0%, 1%, 3%, and 5% w/w, dry basis). With higher concentrations of CNCs, the water-vapor barrier of the films increased, while the optical properties changed very little. Increasing the concentration of the CNCs up to 3% significantly improved the mechanical properties of the nanocomposite. (C) 2014 Elsevier Ltd. All rights reserved.