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Effect of density of hydrogen-bonding donor on hydrogen-bonded multilayer buildup

Chinese Science Bulletin 2005年第17期50卷 1864-1868页

作者： ZHANG Hongyu MA Ning WANG Zhiqiang Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of Chemistry Tsinghua University Beijing 100084 China Key Laboratory for Supramolecutar Structure and Materials College of Chemistry Jilin University Changchun 130012 China

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.

关键词：聚乙烯置换反应合成方法自集合层层结构

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New Strategies for Constructing Polymeric Micelles and Hollow Spheres Via Self-Assembly

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复旦学报（自然科学版） 2005年第5期44卷 621-622页

作者： Ming Jiang Macromolecular Science Department and Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 China

In recent years, self-assembly of block copolymers leading to micelles in selective solvents, which dissolve only one of the blocks, has developed rapidly because the micelles are very strong candidates for potential applications in advanced technologies. The micelles usually have core-shell structure which are connected by covalent bonds. Based on our long-term research on interpolymer complexation due to hydrogen bonding, where we noticed that the complexation often led to the formation of irregular aggregates, we succeeded recently in developing a series of new approaches to polymeric micelles and hollow spheres via specific intermolecular interactions. As in these approaches, a variety of polymers with interacting groups i.e. homopolymers, random copolymers, graft copolymers as well as low mass compounds (LMC), can be used as building blocks, our research strategies have substantially extended the field of self-assembly.

关键词：聚合体材料凹球形自集合氢结合

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Self-Organization of Urea-Based Oligomers from Structure to Function

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复旦学报（自然科学版） 2005年第5期44卷 684-685页

作者： G. Guichard Immunologie et Chimie Thérapeutiques (UPR 9021 CNRS) Institut de biologie Moléculaire et Cellulaire Strasbourg France

The remarkable and highly diverse biological activities exhibited by proteins rely on the unique capacity of these intrinsically flexible α-polypeptide chains to fold into well ordered and compact structures. The formation of protein tertiary and quaternary structures is attainable only with a small set of distinct secondary structural elements: i) sheets, ii) helices, and iii) *** fascinating structures have undoubtedly stimulated chemists to elaborate new synthetic oligomeric materials that could self-organize spontaneously but in a controlled fashion to form defined structural *** the field of biomimetic chemistry, seminal work by several research groups has demonstrated that properties such as folding and structural diversity are not restricted to natural linear α-polypeptides but are shared by a number of aliphatic (e. g. β- and γ-peptides)[1-3] and aromatic[4] oligo-amides. The predictability of folding in these oligomeric strands can be integrated to develop molecules with function (e. g. in biology).

关键词：自集合生物活性可折叠性分子大环多肽

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