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首页> 外文期刊>Journal of Applied Polymer Science >Polymer nanocomposites with cellulose nanocrystals made by co-precipitation
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Polymer nanocomposites with cellulose nanocrystals made by co-precipitation

机译：聚合物纳米复合材料与共沉淀制成的纤维素纳米晶体

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A premixing method to produce polymer nanocomposites with cellulose nanocrystals (CNCs) is reported. This method involves the dissolution and dispersion of a polymer and CNCs in an organic solvent, co-precipitation into water, drying of the resulting particles, and subsequent melt processing. The key aspect of the method is that it allows the kinetic trapping of well-dispersed CNCs in the polymer. Although the nanocomposite must be dried before subsequent melt-processing, the organic solvent can be removed by extraction in water and recycled, leaving only residual water in the composite, which is easily eliminated. This process presents numerous advantages compared with the time-consuming solvent casting process, which often suffers from incomplete organic solvent evaporation. As a testbed, polyurethane (PU) composites with up to 30% of CNCs were prepared. These materials were either melt-processed as produced or used as a masterbatch, i.e., they were diluted via melt-mixing with neat polymer toward nanocomposites with lower filler content. All nanocomposites prepared using this approach had a homogeneous appearance. They displayed similar mechanical properties as the corresponding reference materials made by solvent casting, and significantly better properties than materials prepared by direct melt mixing. (C) 2017 Wiley Periodicals, Inc.
机译：报道了一种用纤维素纳米晶体（CNC）产生聚合物纳米复合材料的预混合方法。该方法涉及聚合物和CNC在有机溶剂，共沉淀到水中，干燥所得颗粒的干燥以及随后的熔融加工中的溶解和分散。该方法的关键方面是它允许在聚合物中挖出分散的CNCS的动力学捕获。尽管在随后的熔融加工之前必须将纳米复合材料干燥，但是可以通过在水中萃取并再循环除去有机溶剂，仅留下复合材料中的残留水，这很容易被消除。与耗时的溶剂铸造过程相比，该方法具有众多优点，这通常存在不完全有机溶剂蒸发。作为试验台，制备了高达30％CNC的聚氨酯（PU）复合材料。这些材料熔融加工，如生产或用作母料，即，它们通过熔融聚合物与具有较低填充含量的纳米复合材料熔融混合稀释它们。使用该方法制备的所有纳米复合材料具有均匀的外观。它们显示出类似的机械性能作为通过溶剂铸造制造的相应参考材料，并且比通过直接熔融混合制备的材料明显更好的性能。 （c）2017 Wiley期刊，Inc。

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