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《高分子科学(英文版)》 2016-10
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Investigation of Cationic Soapless P(St-co-DMAEMA) Latex and Its Electrostatic Adsorption of Laponite

Jie Shen;Jing Xu;Yang Hu;Jian-wu Sun;Ling-xiao Li;Cheng-you Kan;Department of Chemical Engineering, Key Laboratory of Advanced Materials of Ministry of Education,Tsinghua University;  
Cationic poly(styrene-co-N,N-dimethylaminoethyl methacrylate)(P(St-co-DMAEMA)) latexes were prepared in the absence of surfactant by using 2,2'-azobis(2-methylpropionamidine) dihydrochloride(AIBA) as the initiator. The effects of the AIBA concentration, HCl/DMAEMA molar ratio and DMAEMA amount on the emulsion polymerization and the latex properties were investigated. The particle morphology and size, the zeta potential and the amino distribution of the P(Stco-DMAEMA) latexes were characterized by transmission electron microscope(TEM), dynamic light scattering(DLS) and conductometric titration, respectively. Results showed that the emulsion polymerization performed smoothly with high monomer conversion and narrow particle size distribution under the optimized conditions with AIBA concentration of1 wt%, HCl/DMAEMA molar ratio of 1.2 and DMAEMA content of 5 wt%. The diameter of the dried latex particles decreased and the density of amino groups on the particle surfaces increased with increasing the DMAEMA content. The zeta potential of the P(St-co-DMAEMA) latexes was p H-dependent and the zero point was around at p H 7.2. A facile method was developed to fabricate P(St-co-DMAEMA)/laponite hybrid nanoparticles via electrostatic adsorption, in which the loading capacity of laponite platelets reached 17.7 wt%, and the resultant hybrid nanoparticles showed good thermal stability.
【Fund】: financially supported by the National Basic Research Program of China(No.2014CB932202)
【CateGory Index】: TQ316.334
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