| Effect of density of hydrogen-bonding donor on hydrogen-bonded multilayer buildup |
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| 作者姓名： | ZHANG Hongyu MA Ning WANG Zhiqiang |
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| 作者单位： | [1]Key Laboratory of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing 100084, China [2]Key Laboratory for Supramolecutar Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China |
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| 摘 要： | The effect of density of hydrogen-bonding donor （HBD） on the formation of layer-by-layer assemblies of poly（4-vinylpyridine） and poly（4-vinylphenol） was investigated. For this purpose, a series of ethyl-substituted poly（4-vinylphenol） （EsPVPhf） with variable ethyl substitute percentage was synthesized by grafting the phenol moiety along the poly（4-vinylphenol） backbone with 1-bromoethane. UV-vis spectroscopy revealed a uniform deposition process of the hydrogen-bonded multilayer consisting of poly（4- vinylpyridine） （PVPy） and EsPVPhf with variable density of HBD. Notably, it was found that increasing the HBD density of EsPVPhf resulted in a marked decrease of both amount of polymers adsorbed and film thickness, which should be related to the EsPVPhf conformation change from coiled state to extended conformation in ethanol solution. Compared with the effect of charge density in polyelectrolyte multUayer, however, there does not exist a critical density of HBD in our case of hydrogen-bonded multilayer assembly. In addition, surface structures of PVPy/EsPVPhf multilayer films also can be tailored controllably by adjusting HBD density of EsPVPhf. As a result, a new method for tuning the structure of hydrogen-bonding-directed multilayer films was developed.
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| 关 键 词： | 聚乙烯 置换反应 合成方法 自集合 层层结构 |
| 收稿时间： | 2005-04-19 |
| 修稿时间： | 2005-04-192005-05-17 |
Effect of density of hydrogen-bonding donor on hydrogen-bonded multilayer buildup |
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| ZHANG Hongyu MA Ning WANG Zhiqiang.Effect of density of hydrogen-bonding donor on hydrogen-bonded multilayer buildup[J].Chinese Science Bulletin,2005,50(17):1864-1868. |
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| Authors: | Zhang Hongyu Ma Ning Wang Zhiqiang |
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| Institution: | ZHANG Hongyu2, MA Ning2 & WANG Zhiqiang1 1. Key Laboratory of Organic Optoelectronics and Molecular Engineer-ing, Department of Chemistry, Tsinghua University, Beijing 100084, China; 2. Key Laboratory for Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, China |
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| Abstract: | The effect of density of hydrogen-bonding do-nor (HBD) on the formation of layer-by-layer assemblies of poly(4-vinylpyridine) and poly(4-vinylphenol) was investi-gated. For this purpose, a series of ethyl-substituted poly(4-vinylphenol) (EsPVPhf) with variable ethyl substitute percentage was synthesized by grafting the phenol moiety along the poly(4-vinylphenol) backbone with 1-bromoethane. UV-vis spectroscopy revealed a uniform deposition process of the hydrogen-bonded multilayer consisting of poly(4- vinylpyridine) (PVPy) and EsPVPhf with variable density of HBD. Notably, it was found that increasing the HBD density of EsPVPhf resulted in a marked decrease of both amount of polymers adsorbed and film thickness, which should be re-lated to the EsPVPhf conformation change from coiled state to extended conformation in ethanol solution. Compared with the effect of charge density in polyelectrolyte multilayer, however, there does not exist a critical density of HBD in our case of hydrogen-bonded multilayer assembly. In addition, surface structures of PVPy/EsPVPhf multilayer films also can be tailored controllably by adjusting HBD density of EsPVPhf. As a result, a new method for tuning the structure of hydrogen-bonding-directed multilayer films was devel-oped. |
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| Keywords: | layer-by-layer self-assembly hydrogen-bonded multilayer |
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