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Cellulose microanocrystals reinforced polyurethane

机译:纤维素微/纳米晶体增强聚氨酯

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摘要

Nano- and micron-sized cellulose crystals were prepared and utilized as reinforcements for polyurethane composites. The cellulose crystals obtained from microcrystalline cellulose (MCC) were incorporated into a polar organic solvent, dimethylformamide (DMF), and ultrasonicated to obtain a stable suspension. The suspension was an effective means for incorporating the cellulose crystals into the polyol-isocyanate mixture, utilized to produce polyurethane composite films. The use of DMF presents an interesting alternative for the use of cellulose crystals as reinforcement of a broad new range of polymers. Moreover, the rheology of the uncured liquid suspensions was investigated, and analysis of the results indicated the formation of a filler structure pervading the liquid suspension. Besides, films were prepared by casting and thermal curing of the stable suspensions. Thermomechanical and mechanical testing of the films were carried out to analyze the performance of the composites. The results indicated that a strong filler-matrix interaction was developed during curing as a result of a chemical reaction occurring between the crystals and the isocyanate component.
机译:制备了纳米和微米尺寸的纤维素晶体,并将其用作聚氨酯复合材料的增强材料。将由微晶纤维素(MCC)获得的纤维素晶体掺入极性有机溶剂二甲基甲酰胺(DMF)中,并进行超声处理以获得稳定的悬浮液。悬浮液是将纤维素晶体掺入多元醇-异氰酸酯混合物中的有效手段,用于生产聚氨酯复合膜。 DMF的使用提供了一种有趣的替代方法,可用于将纤维素晶体用作多种新型聚合物的增强剂。此外,研究了未固化的液体悬浮液的流变学,对结果的分析表明形成了遍及液体悬浮液的填料结构。此外,通过流延和热固化稳定的悬浮液来制备膜。对薄膜进行了热力学和机械测试,以分析复合材料的性能。结果表明,由于晶体与异氰酸酯组分之间发生化学反应,固化过程中形成了强烈的填料-基体相互作用。

著录项

  • 来源
    《Journal of Materials Research》 |2006年第4期|p.870-881|共12页
  • 作者单位

    Institute de Investigaciones en Ciencia y Technologia de Materiales (INTEMA), Chemical Engineering Department, Universidad National de Mar del Plata, 7600 Mar del Plata, Argentina;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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