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PREAPARATION OF CATIONIC LATEXES OF POLY(STYRENE-CO-BUTYL ACRYLATE) AND THEIR PROPERTIES EVOLUTION IN LATEX DILUTION

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Chinese Journal of Polymer Science 2012年第2期30卷 278-286页

作者：孔祥正 College of Chemistry and Chemical Engineering University of JinanJinan 250022China

Cationic latexes were prepared through emulsion copolymerization of styrene （St） and butyl acrylate （BA） with a cationic surfactant, cetyl trimethyl ammonium bromide （CTAB）. Latex properties, including particle size, size distribution, （ potential, surface tension and monomer conversion, were determined for latexes prepared with different CTAB amounts. Evolution of these properties during emulsion polymerization was followed in order to understand the mechanism of the particles formation. Results showed that both particle size and 6＂ potential were function of polymerization time and latex solids. Parallel emulsion polymerizations with cationic, anionic charged initiator and charge-free initiators were also carried out, the latex properties were determined at different polymerization time. All these results were attentively interpreted based on the mechanisms of emulsion polymerization, surfactant adsorption and latex particle stabilization.

关键词： Cationic latex Styrene Butyl acrylate cetyl trimethyl ammonium bromide Particle size evolution.

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Significantly Enhanced Actuation Performance of IPMC by Surfactant-Assisted Processable MWCNT/Nafion Composite

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Journal of Bionic Engineering 2013年第3期10卷 359-367页

作者： Qingsong He Min Yu Dingshan Yu Yan Ding Zhendong Dai Institute of Bio-Inspired Structure and Surface Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 P. R. China College of Mechanical and Electrical Engineering Nanjing University of Aeronautics & Astronautics Nanjing 21 O016 P. R. China Department of Chemical Engineering Case Western Reserve University Cleveland 44106 USA

The performance of Ionic Polymer Metal Composite （IPMC） actuator was significantly enhanced by incorporating surfactant-assisted processable Multi-Walled Carbon Nanotubes （MWCNTs） into a Nation solution. Cationic surfactant cetyl trimethyl ammonium bromide （CTAB） was employed to disperse MWCNTs in the Nation matriX, forming a homogeneous and stable dispersion ofnanotubes. The processing did not involve any strong acid treatment and thus effectively preserved the excellent electronic properties associated with MWCNT. The as-obtained MWCNT/Nafion-IPMC actuator was tested in terms of conductivity, bulk and surface morphology, blocking force and electric current. It was shown that the blocking force and the current of the new IPMC are 2.4 times and 1.67 times higher compared with a pure Nation-based IPMC. Moreover, the MWCNT/IPMC performance is much better than previously reported Nafion-IPMC doped by acid-treated MWCNT. Such significantly improved performance should be attributed to the improvement of electrical property associated with the addition of MWCNTs without acid treatment.

关键词： ionic polymer metal composite homogeneous actuator conductivity cetyl trimethyl ammonium bromide multi-walled carbon nanotube

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Synthesis of mesoporous cerium-zirconium mixed oxides by hydrothermal templating method

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Journal of Central South University of Technology 2008年第6期15卷 796-800页

作者：王曼娟古映莹秦利平李金林徐文泱 School of Chemistry and Chemical Engineering Central South University Science and Technology Department Guangxi University of Technology Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education Hubei ProvinceSouth-Central University for Nationalities

Mesoporous cerium-zirconium mixed oxides were prepared by hydrothermal method using cetyl trimethyl ammonium bromide (CTAB) as template. The effects of amount of template, pH value of solution and hydrothermal temperature on mesostructure of samples were systematically investigated. The final products were characterized by XRD, TEM, FT-IR, and BET. The results indicate that all the cerium-zirconium mixed oxides present a meso-structure. At molar ratio of n(CTAB)/n((Ce)+(Zr))= 0.15, pH value of 9, and hydrothermal temperature of 120 ℃, the samples obtained possess a specific surface area of 207.9 m2/g with pore diameter of 3.70 nm and pore volume of 0.19 cm3/g.

关键词： cerium-zirconium mixed oxides hydrothermal method cetyl trimethyl ammonium bromide mesopore template

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