Synthesis of Organic-inorganic Hybrid Nanocapsules by Using Low Molecular Weight Droplets as Template

Abstract

Abstract: A novel nanocapsules were synthesized by miniemulsion polymerization the using low molecular weight droplets as the template. Styrene and 3-trimethoxysilyl propyl methacrylate(MPS), which contain vinyl and Si—OR groups, are copolymerized on the surface of the well dispersed isooctane droplets to form capsules. With the free radical copolymerization, the Si—OR groups can be hydrolyzed and condensed into Si—O—Si inorganic network. The diameter of the capsules is about 98 nm and the void fraction is about 70%. The morphology of the capsules was characterized by transmission electron microscopy, and the microstructures of the capsules were characterized by infrared spectrometry. The effects of the polymerization methods and monomer volume fraction on the morphology were discussed. It is found that the initial volume fraction of the monomer in the recipe must be lower than 36% to obtain capsules, and higher MPS volume fraction is favor in the formation of capsules, but a higher MPS content in capsules will lead to collapse. Finally, the mechanism of this synthetic process was interpreted by thermodynamic and kinetic analysis.

Key words: Organic-inorganic hybrid, Nanocapsule, Styrene

CLC Number:

O631

TrendMD:

NI Ke-Fan, SHAN Guo-Rong, WENG Zhi-Xue . Synthesis of Organic-inorganic Hybrid Nanocapsules by Using Low Molecular Weight Droplets as Template[J]. Chem. J. Chinese Universities, 2005, 26(5): 948.

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Synthesis of Organic-inorganic Hybrid Nanocapsules by Using Low Molecular Weight Droplets as Template

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