Preparation of PS Colloids with DMA and MMA Comonomers and Suitability of P(S/DMA) for Colloidal Silica Deposition

WOS: 000306525000010
There is a lack of investigation on the effects of hydrophilic comonomer and pH on the particle size of functionalized polystyrene colloids. In this study, polystyrene (PS) colloids were prepared via emulsifier-free emulsion copolymerization of styrene (S) with 2-(dimethylamino) ethyl methacrylate (DMA) and methyl methacrylate (MMA) at pH 3.0 and 7.0. The sizes of the colloidal particles greatly depended on the comonomer type and pH. The hydrodynamic diameters of the particles ranged from 95 nm to 265 nm and their polydispersity index (PDI) values were less than 0.1. The particles containing comonomer moieties had spherical morphology and good stabilities. P(S/DMA) particles, especially showed excellent colloidal stability and had positive zeta potential values at the acidic pH range as a result of protonation of tertiary amine group of the DMA moiety. In addition, DMA functionalized PS colloids enabled to easy way for the preparation of PS/SiO2 composites. By physically deposition of silica nanoparticles onto the P(S/DMA) at acidic medium, PS/SiO2 core/shell composite particles were obtained. Both preparations of PS colloids and PS/SiO2 composites were easy and one-pot syntheses.
Scientific Research Projects Commission at Anadolu University [1001F28]
This work is supported by the Scientific Research Projects Commission at Anadolu University (Grant No. 1001F28). Authors would like to thank Dr. M. Erdem, Anadolu University, for SEM and EDX and Plant, Drug and Scientific Research Center at Anadolu University for TEM measurements.