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Injection moldings of micro fibrillated cellulose reinforced biodegradable PLA

微纤化纤维素增强可生物降解PLA注塑件

基本信息

批准号：
15380120
负责人：
YANO Hiroyuki
金额：
$ 8.06万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

Recently 'green-composites' have been focused on materials made from plant fibers and bio-based resins. Plant fibers are not only renewable but also have low density and high strength when compared to glass fibers, which are in common use for making FRP (Fiber Reinforced Plastics). Hence, nano-sized plant fibers are recognized as a potential reinforcing material. Fibrillation of wood pulp fibers (microfibrillated cellulose, MFC) is one of the ways to obtain nano-sized plant fibers. There are many reports describing that mechanical and thermal properties of composites are highly enhanced by utilizing such plant nanofibers as reinforcing material. On the basis of these researches, in this project, we studied the production of MFC reinforced biodegradable PLA mouldings by injection mouldings. The main purpose of this research is to obtain fibrillated wood pulp/PLA nanocomposites by the melt-mixing method and to assure the potential of the nanocomposites for injection moulding.By premixing MFC and PLA in the solvent, we could make well dispersed fiber composites and improve strength and Young's modulus of the composites over the neat PLA. Surface acetylation of MFC was found to be effective to increase interactive forces between cellulose nanofiber and PLA. The addition of acetylated MFC to PLA by 5 wt% improved the Young's modulus and tensile strength of PIA by 25% and 15%, respectively.Finally, we, have succeeded in the injection moulding of MFC reinforced PIA, which showed excellent thermal stability compared to neat PIA mouldings.

近年来，“绿色复合材料”的研究重点是由植物纤维和生物基树脂制成的材料。植物纤维不仅是可再生的，而且与通常用于制造FRP（纤维增强塑料）的玻璃纤维相比，具有低密度和高强度。因此，纳米植物纤维被认为是一种潜在的增强材料。木浆纤维（微纤化纤维素，MFC）的原纤化是获得纳米级植物纤维的途径之一。有许多报道描述了通过利用这样的植物纳米纤维作为增强材料来高度增强复合材料的机械和热性能。在这些研究的基础上，本课题研究了用注射成型法制备MFC增强的可生物降解聚乳酸模制品。本研究的主要目的是通过熔融共混法制备原纤化木浆/聚乳酸纳米复合材料，并通过在溶剂中预混MFC和聚乳酸，制备分散良好的纤维复合材料，使复合材料的强度和杨氏模量比纯聚乳酸有所提高。MFC的表面乙酰化被发现是有效的，以增加纤维素纤维和PLA之间的相互作用力。加入5wt%的乙酰化MFC到PLA中，使PIA的杨氏模量和拉伸强度分别提高了25%和15%。最后，我们成功地注射成型了MFC增强的PIA，与纯PIA模制品相比，其显示出优异的热稳定性。