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Zou, J., Jiang, L., Nguyen, T. P. & Dan, Y. (2010) Studies on UV-stability of poly(MMA-co-M12-co-BPMA)/TiO2 composite particles prepared by ultrasonically initiated emulsion polymerization. Polym. Adv. Technol. 21 598–605.
Added by: Laurent Cournède (2016-03-10 21:37:32) |
| Type de référence: Article DOI: 10.1002/pat.1473 Numéro d'identification (ISBN etc.): 1042-7147 Clé BibTeX: Zou2010 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: coated tio2 nanoparticles, composite particles, copolymerization, emulsion polymerization, heterophase polymerization, methyl methacrylate, photostabilizers, poly(methyl methacrylate), reactive surfactants, Titanium dioxide, ultrasonically initiated, UV-stability Créateurs: Dan, Jiang, Nguyen, Zou Collection: Polym. Adv. Technol. |
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In this paper, poly(methyl methacrylate-co-sodium sulfopropyl lauryl maleate-co-2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone)/TiO2 (i.e., poly(MMA-co-M12-co-BPMA)/TiO2) composite particles were prepared by ultrasonically initiated emulsion polymerization. To study the dispersion and UV-stability of the composite particles, laser diffraction particle size analyzer (LDPSA), ultraviolet-visible absorption spectroscopy (UV-vis), UV-vis diffuse reflectance spectroscopy (DRS), differential scanning calorimeter (DSC), and the weight loss measurement were used. The results indicate that the dispersion of the poly(MMA-co-M12-co-BPMA)/TiO2 composite particles prepared by ultrasonically initiated emulsion polymerization is good. And the composite particles can absorb UV light; the ultraviolet absorption strength of poly(MMA-co-M12-co-BPMA) grafted onto the surface of TiO2 has not changed after UV irradiation while that of PMMA changed significantly. The UV absorption strength, weight loss, and Tg changes are in the order PMMA{>} poly(MMA-co-M12-co-BPMA) {>}PMMA grafted onto TiO2{>} poly(MMA-co-M12-co-BPMA) grafted onto TiO2. These results show that the ultrasonically initiated emulsion polymerization will enhance the UV stability of composite particles, and the UV-stability of PMMA can be enhanced by the introduction of the organic UV-stabilizer BPMA and the inorganic UV-stabilizer titanium dioxide into the PMMA chains by covalent bond, and the effect of the BPMA and the TiO2 used together is better than that used, respectively. Copyright (C) 2009 John Wiley \& Sons, Ltd.
Added by: Laurent Cournède |