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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of transparent cellulose films using an improved cellulose dissolution process
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Preparation and characterization of transparent cellulose films using an improved cellulose dissolution process

机译：一种使用改进的纤维素溶解过程的透明纤维素膜的制备与表征

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摘要

Effective dissolution of cellulosic macromolecules is the first predominant step to prepare functional bio-based materials with desirable properties. In this study, we developed an improved dissolution process using a freeze-drying pretreatment to promote the dissolution of cellulose. Rheological measurements of cellulose solutions and physicochemical characterization of regenerated cellulose films (scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and thermogravimetric analysis) were performed. Cellulose solution prepared from 5% microcrystalline cellulose (w:v) in the solvent exhibits a Newtonian fluid character while cellulose solutions at higher concentrations show a pseudo-plastic fluid behavior. Results from physicochemical characterization indicate that a freeze-drying pretreatment step of cellulose leads to a complete dissolution at 5% concentration while only part of cellulose is dissolved at 10% and 15% concentrations. The results obtained indicated that the use of a freeze-drying pretreatment step under mild conditions lead to a complete dissolution of cellulose at 5% concentration. The cellulose films prepared from 5% concentration exhibited desirable properties such as good optical transparency, crystallinity, and thermal stability. (C) 2017 Wiley Periodicals, Inc.
机译：纤维素大分子的有效溶解是制备具有所需性质的功能性生物基材料的第一主要步骤。在这项研究中，我们使用冷冻干燥预处理开发了一种改进的溶解过程，以促进纤维素的溶解。进行了再生纤维素膜的纤维素溶液的流变测量和物理化学表征（扫描电子显微镜，傅里叶变换红外光谱，X射线衍射和热重分析）。溶剂中5％微晶纤维素（W：V）制备的纤维素溶液表现出牛顿液特征，而较高浓度的纤维素溶液显示出伪塑料流体行为。物理化学表征的结果表明，纤维素的冷冻干燥预处理步骤导致5％浓度的完全溶解，同时仅将部分纤维素溶解在10％和15％浓度下。得到的结果表明，在温和条件下使用冷冻干燥预处理步骤导致在5％浓度下完全溶解纤维素。由5％浓度制备的纤维素薄膜表现出理想的性质，例如良好的光学透明度，结晶度和热稳定性。 （c）2017 Wiley期刊，Inc。

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