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Tribological Study on Polymer Nanocomposites by Transmission Electron Microscopy

聚合物纳米复合材料的透射电子显微镜摩擦学研究

基本信息

批准号：
14350492
负责人：
KOMOTO Tadashi
金额：
$ 9.41万
依托单位：
Gunma University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14350492/
关键词：
TRANSMISSION ELECTRON MICROSCOPY NANOCOMPOSITE CARBON NANOTUBE TRIBOLOGY MORPHOLOGY 高分子

项目摘要

Very few studies have been reported on tribology of polymer nanocomposites. The purpose of the present project is to prepare polymer nanocomposites promising for new tribological properties. Macroscopic tribological experiments were also intended to be made with a conventional friction machine usually used in the field of mechanical engineer. Morphological exmanimation in the scale of nanoorder is thought to be very important to clarify the tribological behavior of the composites by transimission electron microscopy(TEM) in order to develop new polymer nanocomposites as tribomaterials.Along this line of argument, polymer nanocomposites were prepared from pehnolic resin and carbon nanotubes as follows. Phenolic resin oligomers prepared in the firsit stage were mixed with carbon nanotubes and then the mixture was heated to allow to undergo a further polymerization of phenolic resin. Afer cooling the reaction product down to room temperature, the solidified product was ground to powders which were further heated again at a higher temperature to prepare a nanoomposite sheet under a pressed conditon.Morphology of ultrathin sections of the resultant sheet was examined by TEM, revealing a homogeneous dispersion of nanotubes in the resin matrix. Friction experiments revealed that friction coefficient decreased with increasing filler content, while wear increased. Morphological examinations by scanning electron microscopy(SEM) and TEM gave rise to a plausible mechanism of formation and propagation of microcrazes on the composite surface.In conclusion, TEM study can be said to be promising method for application to development of new polymer nanocomposites for new tribomaterials.

聚合物纳米复合材料的摩擦学研究报道很少。本项目的目的是制备具有新的摩擦学性能的聚合物纳米复合材料。在机械工程领域常用的摩擦试验机上进行了宏观摩擦学试验。为了开发新型的聚合物纳米复合摩擦材料，利用透射电镜（TEM）对纳米尺度的形貌进行研究是非常重要的。沿着这一思路，以酚醛树脂和碳纳米管为原料制备了聚合物纳米复合材料。将第一阶段制备的酚醛树脂低聚物与碳纳米管混合，然后将混合物加热以允许进行酚醛树脂的进一步聚合。将反应产物冷却至室温后，将固化产物研磨成粉末，在较高温度下再次加热以在压制条件下制备纳米复合片材，通过TEM检查所得片材的断面形貌，揭示纳米管在树脂基体中均匀分散。摩擦实验表明，随着填料含量的增加，摩擦系数降低，磨损量增加。通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）对复合材料表面微银纹的形成和扩展机理进行了分析，认为TEM研究是开发新型聚合物纳米复合材料的有效方法。