Poly[ethylene‐co‐(vinyl acetate)] (EVA) and cellulose nanocrystals (CNCs) from curaua fibers were used to obtain nanocomposites. Due to polarity that acetate groups promote in EVA, they tend to present better affinity with cellulose nanostructures without compatibilizers. In addition, the influence of the drying conditions of CNCs suspension on their dispersion through the matrix was also evaluated. CNCs were obtained via acid hydrolysis in a mixture of sulfuric and hydrochloric acids. Part of CNCs in neutral suspension was freeze‐dried and part was dried in an oven with air circulation. The dried CNCs were incorporated into EVA at concentrations of 1, 3, and 5 wt% of each CNCs. The compositions were processed in a corotating twin‐screw extruder and injection molded. Morphological results showed better dispersion and adhesion of freeze‐dried nanocrystals into EVA, and these nanocomposites also presented increase in elastic modulus and elongation at break, resulting in more resilient and elastic materials.

中文翻译：

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姜黄纤维和聚[乙烯-共-（醋酸乙烯酯）]纳米复合材料的纤维素纳米晶体：CNC干燥过程对热和机械性能的影响

聚[乙烯-共-（醋酸乙烯酯）]（EVA）和来自姜黄纤维的纤维素纳米晶体（CNC）用于获得纳米复合材料。由于乙酸酯基团在EVA中具有促进作用的极性，它们倾向于与纤维素纳米结构表现出更好的亲和力，而没有增容剂。此外，还评估了CNC悬浮液的干燥条件对其通过基质分散的影响。CNCs是通过在硫酸和盐酸的混合物中进行酸水解而获得的。将中性悬浮液中的部分CNC冷冻干燥，然后在空气流通的烘箱中干燥。将干燥的CNCs以每种CNCs的1、3和5 wt％的浓度掺入EVA。组合物在同向双螺杆挤出机中加工并注塑。形态学结果表明，冷冻干燥的纳米晶体在EVA中的分散性和粘附性更好，