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首页> 外文期刊>Journal of Applied Polymer Science >Morphological investigation of cellulose acetate/cellulose nanocrystal composites obtained by melt extrusion
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Morphological investigation of cellulose acetate/cellulose nanocrystal composites obtained by melt extrusion

机译：熔融挤出制得的醋酸纤维素/纤维素纳米晶复合材料的形态研究

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Composites were prepared from cellulose acetate (CA) and cellulose nanocrystals (CNC) by melt extrusion using two methods for the introduction of CNC: direct mixing and predispersion in CA solution. CNC were isolated using hydrochloric acid to increase thermal stability allowing the composites to be processed above 150 degrees C. The effect of CNC dispersion on the composites morphology, thermal, and mechanical properties was investigated. Field emission scanning electron microscopy and transmission electron microscopy results indicated that the predispersion method allows better CNC dispersion and distribution when compared to the direct mixture method. In addition, predispersion promotes preferential CNC orientation in relation to the injection flow. The predispersion method also showed a 14% Young's modulus increase in composites containing 15 wt % CNC while no significant change was observed when using the direct mixing. The results obtained in this work show that, to achieve the percolation threshold, nanoparticle distribution is as important as their content. (C) 2016 Wiley Periodicals, Inc.
机译：由醋酸纤维素（CA）和纤维素纳米晶体（CNC）通过熔融挤出法使用两种引入CNC的方法制备复合材料：直接混合和在CA溶液中预分散。使用盐酸分离CNC以提高热稳定性，使复合材料能够在150摄氏度以上的温度下进行加工。研究了CNC分散液对复合材料的形态，热和机械性能的影响。场发射扫描电子显微镜和透射电子显微镜的结果表明，与直接混合法相比，预分散法可实现更好的CNC分散和分布。另外，预分散促进了相对于注射流的优先CNC定向。预分散方法还显示，含15 wt％CNC的复合材料的杨氏模量增加14％，而使用直接混合时未观察到明显变化。这项工作获得的结果表明，要达到渗透阈值，纳米颗粒的分布与其含量一样重要。 （C）2016威利期刊公司

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