Structure and light switching of organic films with an amphiphilic polymer

Langmuir-Blodgett（LB）薄膜中的分子取向、结构和相位转换，由一个柔性羟基表氯酮-乙乙二胺略微交叉连接的微凝胶和一个数目的羟基苯乙烯链（ES-3）已被红外（IR）传输和反射吸收（RA）光谱学研究。一项未经审查的研究表明，ES-3 possess crystaline的LB电影、密集包装的甲基链和在酰胺组之间扩展的链氢键将烷基链与微凝胶连接起来。传输之间的频带强度和RA特别建议的比较，其中氢碳链与一个小倾斜角度高度定向，而酰胺组的N-H和CO键和N-H和OO键之间的接口氢键几乎平行于表面。相位转换已在窄温度范围内观察到65、105和140-C适用于多层LB ... More 第三部电影。这三个温度非常接近于ES-3中散装材料的阶段过渡，但这些过渡通常与LB薄膜分享更多。该说明指出，LB电影的过渡温度与先前报道的那些自汇编（SA）电影有明显的不同。这可能是在两个kinds offilms之间的结构差异; SA films have partial interdigitation of the alkyl tails while the LB films do not have it.A kind of amphiphilic polymer，ES-1， was transferred onto solid substrates as so-called“reversed duckweed”聚合LB films。薄膜的分子方向、结构和相位转换行为是由红外（IR）传输和反射吸收（RA）光谱学研究的。IR的研究表明，烷基链几乎是永久性的，可以说是高度有序的，可以说是电影的表面。第一个单体在ES-1 LB薄膜上储存了不同的方向和排列，因为在ES-1的羟基金表面和羟基头组之间的相互作用。对一个ES-1 LB电影的经蒸发玻璃滑动的温度依赖性红外线测量显示，该电影在预过渡结构修改后约60-C后的顺序紊乱阶段的转变。在LB电影中，烷基链在有序紊乱过渡后的温度被研究所取代。CaF 2板上的ES-1铸造电影的烷基链几乎是永久性的。However，ES-1在一个蒸发的玻璃幻灯片上的烷基链似乎倾斜了。The IR study on the phase transition behavior has revealed that the two casting films on the different substrates give rise to the order-disorder transition at about 75-C after undergoing pretransitional structural changes。在ES-1的铸造电影上，在经蒸发的玻璃幻灯片上显示了一个现象的变化;它们从一个更倾斜的方向中改变了一个更普遍的方向，在无序过渡出现的地方，并在过渡温度上再次倾斜。Less（低）

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 microgels 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 microgels. 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 OO bonds are nearly parallel to the surface. The phase transitions have been observed in the narrow temperature ranges near 65, 105, and 140 ーC for multi-layer LB … More films of ES-3. The three temperatures are very close to those for the phase transitions of bulk materials of ES-3, but the transitions occur more sharply for the LB films. Of note is that the transition temperatures of the LB films are markedly different from those of the self-assembling (SA) films previously reported. This may be due to structural differences in the alkyl chains between the two kinds offilms ; the SA films have partial interdigitation of the alkyl tails while the LB films do not have it.A kind of amphiphilic polymer, ES- 1, was transferred onto solid substrates as so-called "reversed duckweed" polymeric LB films. The molecular orientation, structure and phase transition behavior of the films were studied by infrared (IR) transmission and reflection-absorption (RA) spectroscopy. The IR studies have revealed that the alkyl chains are nearly perpendicular to the film surface and assume highly ordered conformation. The first monolayer has different orientation and arrangement from other layers in the ES-1 LB films deposited on Au-evaporated glass slides because of the interaction between the hydrophobic gold surface and hydrophilic head group of ES-1. Temperature-dependent IR measurements of an ES-1 LB film on an Au-evaporated glass slide have shown that the order-disorder phase transition of the film takes place at about 60-C after pretransitional structural modifications. The packing density of alkyl chains decreases gradually with temperature after the order-disorder transition in the LB film. The alkyl chains in an ES-1 casting film on a CaF2 plate are nearly perpendicular to the film surface. However, the alkyl chains of an ES-1 casting film on an Au-evaporated glass slide are tilted considerably. The IR study on the phase transition behavior has revealed that the two casting films on the different substrates give rise to the order-disorder transition at about 75 ーC after undergoing pretransitional structural changes. The alkyl chains in the casting film of ES-1 on the Au-evaporated glass slide show a phenomenon of reorientation ; they change from a more tilted orientation to a more perpendicular orientation before the order-disorder transition takes place, and become tilted again above the transition temperature. Less