Development of Quantitative Evaluation on Molecular Aggregation in Polymeric Materials by Means of Dynamic Infrared Spectroscopy

动态红外光谱定量评价高分子材料分子聚集的研究进展

基本信息

批准号：
11450370
负责人：
NOMURA Shunji
金额：
$ 5.5万
依托单位：
Kyoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

First of all, after improvement of the optical system in our dynamic infrared (DIR) spectroscopic system, various kinds of machine constants in the optical system were measured in detail.Second, static strain dependence of infrared absorption spectra in segmented poly(urethaneurea) (SPUU) were measured at wavenumber range of 1500 and 1800 cm^<-1>, where we got three kinds of absorption bands attributed to C=O stretching modes. These are assigned to the hydrogen-bonded and hydrogen-free urethane carbonyls in the soft segments, and hydrogen-bonded urea carbonyl in the hard segments. The strain dependence of peak positions, peak hights, and peak widths in three bands were analyzed in detail. By using these static data, the dynamic change of infrared spectra were simulated and compared with the dynamic data. As a result, it was confirmed that the dynamic change in film thickness could be similar to the deformation under constant volume.Finally, the in-phase components in dynamic infrared s … More pectra of SPUU give the positive orientation of the soft segments and the negative orientation of the hard segments. The out-of-phase components of the urea carbonyl groups at -10℃ give the dynamic peak shift of the opposite directions for the parallel and perpendicular polarizations along the strain axis.The relative static and dynamic dichroic difference spectra normalized by the peak height of the urea band are in good agreement except at a lower wavenumber than that at the urea band. On the other hand, the same normalized spectra for the average absorbances give the clear difference between the soft and hard segments. It is derived from this difference that the hydrogen bonds of the urea carbonyl are broken by the dynamic strain along the bonding.From the above discussion on the similarity between the static and dynamic dichroic difference spectra and the difference between the static and dynamic average absorption spectra, it is concluded that stress along the urea carbonyl bonds, but not along the polymer chains, takes an important role on the orientation of the hard segment domains. That is, the soft segments as a matrix component orient toward the strain direction, however the hard segments make perpendicular orientation to the strain axis due to the stress along the urea carbonyl bond, which is perpendicular to the hard segment chain. Less

详细测量了我们动态红外（DIR）光谱系统中的第一个光学系统。在1500和1800 cm^<-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1> <-1>在软段中与氢键和无氢尿烷的羰基签名，并通过使用这些静态数据详细分析了峰值高峰和峰值的尿素羰基。与动态数据相比，已经证实了薄膜的动态变化可以体积。在本文中，动态红外的同相组件...更多的SPUU的pectra给出了软段的正向硬段的负方向。除了在尿素带上，尿素带的光谱与Atata波动相比，在尿素带中的光谱是良好的。尿素羰基的键通过上述关于静态和动态二角差异光谱与静态和动态吸收光谱之间的相似性的讨论从上面的讨论中损坏。聚合物链在硬段域的方向上，即软段作为矩阵分量向应变方向的方向，但是硬段使沿着尿素羰基键键合的垂直段取向了与硬段链的压力。较少的