Infrared Study on Molecular Orientation and Phase Transition in Langmuir−Blodgett Films of an Amphiphilic Microgel Copolymer with the Branching of Octadecyl Groups
Infrared Study on Molecular Orientation and Phase Transition in Langmuir−Blodgett Films of an Amphiphilic Microgel Copolymer with the Branching of Octadecyl Groups
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DOI：
10.1021/jp9811575
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发表时间：
1998-08
影响因子：
3.3
通讯作者：
Bing Zhao;Hongbin Li;Xi Zhang;Jia-cong Shen;Y. Ozaki
中科院分区：
文献类型：
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作者：
Bing Zhao;Hongbin Li;Xi Zhang;Jia-cong Shen;Y. Ozaki
用红外（IR）透射和反射吸收（RA）光谱研究了由柔性亲水环氧氯丙烷-乙二胺微交联微凝胶和疏水硬脂链（ES-3）组成的两亲性聚合物Langmuir - Blodgett （LB）膜中的分子取向、结构和相变。红外光谱研究表明，ES-3 LB膜具有结晶性、紧密排列的亚甲基链和酰胺基团之间延伸的链间氢键，将烷基链与微凝胶连接起来。透射光谱和RA光谱的波段强度比较表明，烃类链取向性强，倾斜角度小，酰胺基团的N−H和CO键以及N−H和CO键之间的链间氢键几乎与表面平行。在不同表面压力下制备的ES-3 LB膜的红外光谱表明，烷基链高度稳定。
Molecular orientation, structure, and phase transition in Langmuir−Blodgett (LB) films of an amphiphilic polymer consisting of a flexible hydrophilic epichlorohydrin−ethylenediamine slightly cross-linking microgel and a number of hydrophobic stearic chains (ES-3) have been studied by infrared (IR) transmission and reflection−absorption (RA) spectroscopy. The infrared study indicates that the LB films of ES-3 possess crystalline, tightly packed methylene chains and extended interchain hydrogen bonds between the amide groups, which connect the alkyl chains with the microgel. A comparison of the band intensities between the transmission and RA spectra suggests that the hydrocarbon chains are highly oriented with a small tilt angle and that N−H and CO bonds of the amide groups and the interchain hydrogen bonds between the N−H and CO bonds are nearly parallel to the surface. It is indicated from infrared spectra of LB films of ES-3 prepared under different surface pressures that the alkyl chains are highly ord...