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Self-assembling characteristics of amphiphilic zwitterionic brush random copolymers at the air–water interface

机译：两性两性离子刷无规共聚物在空气-水界面的自组装特征

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Self-assembling characteristics of a series of amphiphilic zwitterionic brush random copolymers, poly(oxy(11-(3-sulfonylpropyltrimethylglycinyl)undecylesterthiomethyl)ethylene-co-oxy(n-do-decylthiomethyl)ethylene)s (PECH-DMAPSm where m is the mol% of DMAPS end group), were investigated at an air–water interface by using surface pressure–area isotherms, infrared spectroscopy, and X-ray reflectivity analysis. Interestingly the random polymers (m: 20–60 mol%) always formed Langmuir monolayer structures only rather than any other structures, regardless of the surface pressures. The Langmuir monolayers possessed enhanced lateral ordering together with conformational changes of the backbone and bristles through increasing the surface pressure. The monolayer structures were basically composed of a hydrophobic bristle phase in the air side and a hydrophilic backbone and bristle phase in the water side. The unique, highly ordered Langmuir monolayer structures could be realized by positive, cooperative efforts of several factors such as the compositional balance of hydrophobic and hydrophilic zwitterionic bristles, the air- and water-induced segregations of the bristles and backbone, the lateral ordering capabilities of the alkyl groups and the alkylenyl linkers in the bristles under the assistance of surface pressure, and the relatively strong anchoring power of DMAPS end groups in the water side using their high water affinity due to the hydrophilic zwitterionic nature. Overall, PECH-DMAPSm revealed a very unique self-assembling behavior at the air–water interface, always producing the Langmuir monolayer structure.
机译：一系列两亲性两性离子刷无规共聚物，聚（氧（11-（3-磺酰基丙基三甲基甘氨酰基）十一烷基酯硫甲基）乙烯- co <​​/ em>-氧（ n -do -癸基硫甲基）乙烯）（PECH-DMAPS m ，其中 m 是DMAPS端基的mol％）通过使用表面压力-面积等温线，红外光谱和X射线反射率分析在气水界面上进行了研究。有趣的是，无规聚合物（ m ：20–60 mol％）始终仅形成Langmuir单层结构，而不是任何其他结构，而与表面压力无关。朗格缪尔单层膜通过增加表面压力，具有增强的侧向排列以及骨架和刚毛的构象变化。单层结构基本上由空气侧的疏水性刷毛相和水侧的亲水性骨架和刷毛相组成。独特，高度有序的Langmuir单层结构可以通过以下几个方面的积极合作来实现，例如疏水性和亲水性两性离子硬毛的组成平衡，空气和水引起的硬毛和骨架的偏析，硬脂酸酯的侧向排序能力在表面压力的帮助下，刚毛中的烷基和亚烷基连接基，以及由于亲水性两性离子性质，DMAPS端基在水侧具有较高的亲和力，因此具有相对较强的锚固能力。总体而言，PECH-DMAPS m 在空气-水界面处表现出非常独特的自组装行为，总是产生Langmuir单层结构。

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