Preparation of surface-modified monodisperse polystyrene microspheres with cationic functional comonomer
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A two-stage synthesis of surface-functionalized monodisperse polystyrene (PS) microspheres in ethanol/water medium by introducing methacryloyloxyethyl dodecyl dimethyl ammonium bromide (QDMDB) to dispersion polymerization of styrene is reported. Polyvinylpyrrolidone (PVP) and fatty alcohol polyoxyethylene ether (AEO-9) are used as dispersion stabilizers. The novel microspheres are characterized by FT-IR, SEM, GPC, TGA, water contact angle (WCA), etc. The dispersion polymerization goes through successfully with the solid content up to 58.75%, in which the water content in the medium is 20%. The water content in the medium has a certain effect on the particle size and molecular weight of microspheres. Under the experimental conditions, the average diameters of the obtained microspheres are approximately 550–1200 nm with the number average molecular weight of up to 5.8 × 105. The introduction of QDMDB improves the wettability and thermal stability of the poly(St-co-QDMDB) microspheres. A mechanism of dispersion copolymerization based on XPS and 1H NMR is proposed.
KeywordsQuaternary ammonium salt Dispersion polymerization PS-co-QDMDB polymer Functional microspheres
We would like to thank the Analytical & Testing Center of Sichuan University for the SEM measurements. Thanks to Yongshuai Xie for testing FT-IR spectra.
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Conflict of interest
The authors declare that they have no conflict of interest.
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