权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

CONSTRUCTION OF INFRARED-ACTIVATED SCANNING AFM SURFACE ANALYZER AND ITS APPLICATION TO THE CHARACTERIZATION OF POLYMER THIN FILM-WATERINTERFACES.

红外激活扫描AFM表面分析仪的构建及其在聚合物薄膜-水界面表征中的应用。

基本信息

批准号：
13555260
负责人：
KITANO Hiromi
金额：
$ 8.96万
依托单位：
University of Toyama
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

A novel infrared-activated scanning AFM surface analyzer was constructed and characterization of polymer thin film-water interfaces using the apparatus was examined. Furthermore, the structure and hydrogen bonding of water in aqueous solution of sulfobetaine polymers were analyzed with contours of O-H stretching of polarized Raman spectra. The number of hydrogen bonding collapsed by the presence of one monomer residue (N value) for the polymers was a small positive value, and comparable to those for neutral polymers. This is in good contrast to the largely positive N values for the precursor polymer, and ordinary polyelectrolytes. The present results clearly indicate that the zwitter ionic polymers do not disturb the hydrogen-bonded network structure of water significantly, probably due to the counteraction of electrostriction effect by the proximity between the anionic and cationic groups. Moreover, the structure of water sorbed into copolymer of (2-methoxyethylacrylate) (MEA) and 2-hydroxyethylmethacrylate (HEMA) was investigated by an attenuated total reflection infrared (ATR-IR) spectroscopy. The effective hydration region around the polymer chain was estimated by the comparison of the extinction coefficient, eOH, for the water sorbed into the polymers contacting with liquid water and water vapor. The result seemed to indicate that the interaction between the primary hydration water and water molecules surrounding them around the MEA-containing polymer chain is very weak. Namely, the effective hydration region around the polymer chain is very small. Such water with the large eOH value seemed to correspond to a "cold-crystallizable" water, which has been observed by DSC as anomalous water other than intermediate and non-freezable waters.

构建了一种新型红外激活扫描AFM表面分析仪，并利用该仪器研究了聚合物薄膜-水界面的表征。此外，利用极化拉曼光谱的O-H拉伸曲线分析了磺胺基甜菜碱聚合物水溶液中水的结构和氢键。单体残留导致的氢键断裂数（N值）为一个小正值，与中性聚合物相当。这与前驱体聚合物和普通聚电解质的大部分正N值形成了良好的对比。目前的结果清楚地表明，两性离子聚合物不会明显扰乱水的氢键网络结构，这可能是由于阴离子和阳离子基团之间的接近抵消了电伸缩效应。此外，利用衰减全反射红外光谱（ATR-IR）研究了（2-甲氧基乙基丙烯酸酯）（MEA）和2-羟乙基甲基丙烯酸酯（HEMA）共聚物的水吸附结构。通过比较与液态水和水蒸气接触的聚合物吸附的水的消光系数eOH，估计了聚合物链周围的有效水化区域。结果似乎表明，初级水合水与含mea聚合物链周围的水分子之间的相互作用非常弱。也就是说，聚合物链周围的有效水化区域非常小。这种具有较大eOH值的水似乎对应于“冷结晶”水，DSC已将其视为异常水，而不是中间和非冷冻水。