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MORPHOLOGY EVOLUTION OF POLY(St-co-BuA)/SILICA NANOCOMPOSITE PARTICLES SYNTHESIZED BY emulsion polymerization

Chinese Journal of Polymer Science 2006年第3期24卷 323-331页

作者： Hua Li 周树学 Bo You Li-min Wu Department of Materials Science The Advanced Coatings Research Center of China Educational Ministry Fudan University Shanghai 200433 China Faculty of Chemistry and Materials Science Hubei University Wuhan 430062 China

Poly（St-co-BuA）/silica nanocomposite latexes were synthesized via conventional emulsion polymerization.in the presence of 3-（trimethoxysilyl）propyl methacrylate modified colloidal nano-silica. The effects of surface property, particle size and content of colloidal nano-silica as well as the concentrations of monomer and surfactant on the morphology of nanocomposite latex particles were investigated by transmission electron microscope （TEM） and scanning electron microscope （SEM） in detail. Various interesting morphologies such as grape-like, Chinese gooseberry-like, pomegranate-like and normal core-shell structures were observed. Droplet nucleation mechanism competing with micelle nucleation mechanism was proposed to explain the morphological evolution of the nanocomposite particles.

关键词： Morphology Colloidal nano-silica Nanocomposite particle emulsion polymerization.

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SYNTHESIS AND PROPERTIES OF ORGANO-FLY ASH/POLY ANILINE WITH CORE/SHELL STRUCTURE BASED ON emulsion polymerization

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Chinese Journal of Polymer Science 2012年第6期30卷 808-814页

作者：雷西萍 Key Laboratory of Western Architecture and Technology School of Materials Science and EngineeringXi'an University of Architecture and Technology

Organo-fly ash （OFA） was prepared with pretreated fly ash （FA） and hexadecyltrimethyl ammonium bromide （HDTMAB）, and the composites composed of OFA and polyaniline were obtained by emulsion polymerization.at different OFA weight ratios （2.0 wt%, 5.0 wt%, 10.0 wt%, 15.0 wt% and 20.0 wt%） in the presence of dodecylbenzenesulfonic acid as dopant and emulsifier. A polymerization.procedure was supposed. The electrical conductivities of the composites were tested by the four-probe technique. The chemical structure and crystallinity of the composites were confirmed by FT-IR and X-ray diffraction, respectively. Morphologies of FA, OFA and the composites were observed by SEM. The element analysis was performed by energy dispersive spectrometry. The thermal stability of the composites was analyzed by TGA. The results showed that the electrical conductivity of the composites decreased with increasing the feed weight ratio of OFA, and the lowest value was 0.62 S/cm. HDTMAB and PAn were just adsorbed on the surface of FA and OFA, respectively according to the physical adsorption without destroying the crystalline structure of FA or OFA. The surface became smoother after organification of FA by using HDTMAB, and its content on FA surfaces was about 26.9 wt%. The core/shell structure of the composite was observed by SEM analysis. The composites showed a higher thermal stability than pure PAn by introduction of OFA into this polymerization.system, the heat stability of PAn was increased by decreasing 31.8 wt% of weight loss after introducing 20 wt% of OFA.

关键词： Fly ash Polyaniline Hexadecyltrimethyl ammonium bromide Core/shell emulsion polymerization.

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Reverse atom transfer radical polymerization.of styrene in emulsion initiated by AIBN or V50

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Science Bulletin 2005年第14期 39-42页

作者： ZHANG Kai, ZHANG Hongwen, LI Hongtu & WANG Jingyuan College of Chemistry, Jilin University, Changchun 130023, China

Reverse atom transfer radical polymerization.of styrene was conducted in emulsion by using Cu(II)/2,2′- bipydine or Cu(II)/phen complexes, AIBN or V50 as the ini- tiator, Brij-98 or OP-10 as the surfactant. The results of GPC showed that both polymerization.processes exhibit living characters when using AIBN as the initiator. However, when V50 was used, the monomer conversion was fairly low and the whole polymerization.was not controlled well. The meas- urement of particle size and its distribution told us that the latex particles were mean and stable when using Brij-98 as the surfactant.

关键词： reverse atom transfer radical polymerization styrene gel permeation chromatography emulsion polymerization.

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