Interaction of pigments with polystyrene latex prepared using a zwitterionic emulsifier |
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| Institution: | 1. Polymers Composites and Hybrids (PCH), IMT Mines Ales, Ales, France;2. LMGC, IMT Mines Ales, Univ. Montpellier, CNRS, Ales, France;1. POLYMAT and Departamento de Química Aplicada, Facultad de Ciencias Químicas, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa hiribidea, 72, 20018 Donostia, Spain;2. IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain;1. POLYMAT, Kimika Aplikatua saila, Kimika Fakultatea, Universidad del País Vasco/Euskal Herriko Unibertsitatea UPV/EHU, Joxe Mari Korta zentroa, Tolosa hiribidea, 72, 20018 Donostia, Spain;2. IKERBASQUE, Basque Foundation for Science, Bilbo, Spain |
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| Abstract: | An emulsion polymerization of styrene in the presence of a zwitterionic emulsifier,N,N-dimethyl-n-laurylbetaine (LNB), was carried out at pH 7.0. The stability of mixed dispersions composed of latex particles prepared with the emulsifier (LNB) and titanium dioxide particles was studied as a function of pH. The zeta potential of the synthesized latex particles was significantly dependent on the pH and showed the existence of an isoelectric point. In the pH range of 3.0–8.3, where the latices are positively charged while titanium dioxide pigment particles are negatively charged, the mixed suspensions of the latices and titanium dioxide particles were dispersed but exhibited heterocoagulation with increasing particle number of the latices. Furthermore, titanium dioxide particles were restabilized with further addition of the latices. The mechanisms of these processes are discussed. A similar experiment was conducted with silica particles. |
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