Modification of larger size CaCO 3 particle with polystyrene via in situ emulsion polymerisation

Abstract

An industrial calcium carbonate (CaCO₃) filler of large particle size was modified with polystyrene (PS) by in situ emulsion polymerisation of styrene. The structure, morphology and thermal stability of the PS/CaCO₃ composite were characterised by Fourier transform infrared spectrograph, scanning electron microscope and thermogravimetric analysis, respectively. The effects of St/CaCO₃ ratio and particle size of CaCO₃ on the encapsulation ratio of the CaCO₃ and the viscosity of the composite in organic solvent were investigated to obtain maximal modification. The results showed that PS had covered the CaCO₃ particles, which changed the surface of CaCO₃ particles from hydrophilic to hydrophobic. The maximal decomposition temperature of the extracted PS/CaCO₃ composite was increased by 17°C in comparison to pure PS. The viscosity of CaCO₃ particles in organic solvent decreased greatly, indicating that the effect of modification was very significant. The large size of the CaCO₃ particle exhibited high encapsulation ratio.

Keywords

POLYMER COMPOSITE CACO3 STYRENE MODIFICATION EMULSION POLYMERISATION

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