Design and Synthesis of Advanced Composites for Cryogenic Uses

低温用途先进复合材料的设计与合成

基本信息

批准号：
07455270
负责人：
YAMAOKA Hitoshi
金额：
$ 4.8万
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：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455270/
关键词：
Cryogenic Advanced composites Design of polymer materials

项目摘要

The purpose of this study is to accumulate the fundamental information for design and synthesis of advanced composites usable in cryogenic environments, From the results obtained in experiments of the first year, it is suggested that the polymers which are able to change the bond angles of the main chain seem to excel in cryogenic properties. This is partly because, even when their segmental motions are frozen out at cryogenic temperatures, these polymers could undergo deformation, and hence could still be flexible by changing the mainchain bond angles. In the experiments of the second year, the relationship between the crystallinity of polymers and the cryogenic properties was studied. The strength and the elongation at break point of polyphenylene sulfide at 77 K increase with an increase in the degree of crystallinity, In the case of polyethylene naphthalate, however, both mechanical properties at 77 K decrease with increasing the degree of crystallinity. These results indicate that the morphology of polymers greatly affects their cryogenic properties. Several properties of polymer composites are dependent on large number of factors such as resin content, relative flexibility of the matrix system, curing temperature and pressure, cure and post-cure cycle, as well as surface treatment of fibers. These findings offer us the useful information for developing the new type of advanced composites for cryogenic applications.

这项研究的目的是从低温环境中累积可在低温环境中使用的高级复合材料的基本信息，这是从第一年的实验中获得的结果，建议能够改变能够改变的聚合物。主链似乎在低温特性中表现出色。这部分是因为即使在低温温度下冻结其节段动作，这些聚合物也可能发生变形，因此，通过改变主链键角，仍然可以灵活。在第二年的实验中，研究了聚合物的结晶度与低温特性之间的关系。但是，在聚乙二醇苯二甲酸酯的情况下，在77 k的聚石硫化物的断裂点上的强度和伸长率增加，但是，这两种机械性能均在77 K下的机械性能降低，随着结晶度的增加而降低。这些结果表明，聚合物的形态极大地影响其低温特性。聚合物复合材料的几种特性取决于大量因素，例如树脂含量，基质系统的相对柔韧性，固化温度和压力，固化和固化后周期以及纤维的表面处理。这些发现为我们提供了开发用于低温应用的新型高级复合材料的有用信息。