Rheo-Optical Studies on High Performance Elastomers for Medical Use.

医用高性能弹性体的流变光学研究。

基本信息

批准号：
01460229
负责人：
NOMURA Shunji
金额：
$ 0.45万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

It was the purpose of this research to clarify change of microphase separated structure in elastomers due to mechanical fatigue and to develop high performance elastomers for medical use.1. Static and dynamic infrared absorption dichroism measurements were performed in order to study the deformation mechanism of segmented poly (urethaneurea) s (SPUU), having different soft segment molecular weights, over a wide range of temperatures and frequency, and the following facts were disclosed :(1) The capability of orientation for the soft segments decreases at high temperature or low frequency. This is due to increase in the effective length of the soft segments by lowering the number of effective cross-links in the soft segment matrix at high temperature or low frequency.(2) The capability of the negative orientation of the hard segments in SPUU having high soft segment molecular weight decreases with increasing temperature but that of low molecular weight does not depend either temperature or frequency. This can be explained based on differences in cohesive force in hard segment domains.2. The mechanical and orientation behavior of segmented polyurethan (SPU) with a polydinethylsiloxane component (PES) in the main chain was investigated, and the following facts were disclosed :(1) Both hard and soft segments are oriented positively from the beginning of stretching, which is completely different from SPUU. This can be explained by low cohesive power of the hard segments.(2) Systematic variations in the mechanical and thermal properties were found with the soft segment molecular weight. The higher the molecular weight, the higher the degree of completion in microphase separation.(3) The PES component in the soft segment reduces the capability of crystallization of PTMG but raises the degree of completion in microphase separation between the soft and hard segments.

这项研究的目的是阐明由于机械疲劳而导致的弹性体分离结构的变化，并开发出高性能的弹性体以供医疗用途。1。进行了静态和动态红外吸收二科运动测量，以研究具有不同软段分子量的分段聚（尿双敏）S（SPUU）的变形机制，在广泛的温度和频率上，并披露了以下事实：（1）软段的方向的能力在高温或低频下降低。这是由于在高温或低频率下降低软段矩阵中的有效交联的数量来增加软段的有效长度。高软段分子量随温度升高而降低，但低分子量的体重不取决于温度或频率。这可以基于硬段域中的凝聚力差异2。研究了主链中与聚二甲基硅氧烷成分（PES）的分段聚氨酯（SPU）的机械和取向行为，并披露了以下事实：（1）从拉伸的开始开始，硬质和软段是积极的，这是积极的，这是积极的，这是伸展运动的积极性，这些片段是积极的。与SPUU完全不同。这可以通过硬段的低内聚力来解释。（2）在软段分子量中发现机械和热性能的系统变化。分子量越高，在微相分离中的完成程度越高。（3）软段中的PES成分降低了PTMG结晶的能力，但提高了软段和硬段之间的微相分离的完成程度。