Well-Defined Organic/Inorganic Hybrids Based on Gelable Block Copolymers in Bulk
Self-assembly of block copolymers has been widely applied in nano-technologies in many fields. If onedomain of the preformed ordered structure of block copolymer can be chemically cross-linked, the microphase structure can be stabilized and, therefore, the robust nano-objects may be obtained. Liu et al1 have applied cross-linkable block copolymers to fix the self-assembly, whereas Wiesner et al2 have used the blockcopolymers as structure-directing agents of metal oxides to prepare organic/inorganic hybrid materials andnano-objects. Recently, this group has studied the properties of a gelable poly(ethyleneoxide)-block-poly(3-(trimethoxysilyl)propyl methacrylate) (PEO-b-PTMSPMA) in a selective solvent. Owing tothe gelation erosslinking, various organic/inorganic hybrid morphologies, including spheres, vesicles andcompound vesicles have been obtained.3 If the present procedure can be extended to the block copolymerself-assembly in bulk, on surface or in confined space, various hybrid materials and well-defined nano-objectscould be produced. Further, more functions like complexation to metal ions and stimulus-responsive could beendowed to these nano-hybrids if the segment could be functionalized. In this talk, we would like to present our recent results on the organic/inorganic hybrids from a gelable blockcopolymer containing poly(3-(triethoxysilyl)propyl methacrylate) (PTEPM) like PTEPM-b-PS andPTEPM-b-P2VP.4,5 The self-gelation process of PTEPM phase in lamellar, cylindrical and spherical structuresusing the gelable block copolymers of different composition was conducted in these preformed microphasestructures. Moreover, the isolated organic/inorganic hybrid nano-objects with controlled shape such as spheres,cylinders, and plates have been obtained by dissolution the bulk materials into a good solvent for thenon-cross-linked block. Scheme 1 presents the principle of self-gelation process to generate novel hybridmaterials. Figure 1 lists the TEM images of the dispersed nano-objects from PTEPM-b-PS. In order to producethe functional nano-objects by this approach, the microphase separation behaviors of a series of PTEPM-b-P2VPand gelation thereof have been performed. Novel water-soluble isolated organic/inorganic hybrid nano-objectswith controlled shapes bearing P2VP hairs have been obtained by dissolving the gelated bulk materials into anacid water solution. Their properties on pH response and gold colloids stabilization have been explored. Theseresults display a powerful approach to produce well-defined hybrid nano-objects that can be a useful platform toconduct many interesting research.6
Ke Zhang Yongming Chen
Laboratory of Polymer Physics and Chemistry,Institute of Chemistry,The Chinese Academy of Sciences,B Laboratory of Polymer Physics and Chemistry,Institute of Chemistry,The Chinese Academy of Sciences,B
国际会议
5th East-Asian Polymer Conference(第5届东亚高分子学术研讨会)
上海
英文
113-114
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）