Studies on UV‐stability of poly(MMA‐co‐M12‐co‐BPMA)/TiO₂composite particles prepared by ultrasonically initiated emulsion polymerization

Abstract

In this paper, poly(methyl methacrylate-co-sodium sulfopropyl lauryl maleate-co-2-hydroxy-4-(3-methacryloxy-2hydroxylpropoxy) benzophenone)/TiO 2 (i.e., poly(MMA-co-M12-co-BPMA)/TiO 2 ) 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)/TiO 2 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 TiO 2 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 TiO 2 > poly(MMAco-M12-co-BPMA) grafted onto TiO 2 . 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 TiO 2 used together is better than that used, respectively.

Photostabilization of Poly(vinyl chloride) by Organotin(IV) Compounds against Photodegradation

“…To increase lifetime of PVC, photodegradation and photo-oxidation should be inhibited. Various heat stabilizers, ultraviolet (UV) absorbers, radical scavengers, and excited-state quenchers have been used to inhibit these processes [11,12,13,14,15,16,17,18,19,20,21,22].…”

Ultraviolet light aging properties of PVC/CaCO3 composites

“…Many additives, such as ultraviolet light screening agents, ultraviolet absorber, excited‐state quencher, and radical scavenger, are used to improve the PVC materials antiaging properties 3–10. Inorganic fillers functioned as light shield agents could enhance antiaging properties of PVC 11–16.…”

Organic–inorganic hybrid polysilsesquioxane nanospheres as UVA/UVB absorber and fragrance carrier

“…[21][22][23][24][25][26][27] Organic-TiO 2 composite particles were recently fabricated using poly(methyl methacrylateco-sodium sulfopropyl lauryl maleate-co-2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone). 28 In order to appreciate the non-sticky nature and minimal transdermal penetration of silica particles, and at the same time fully harness the UV absorption characteristics of organic chromophores without concern over their systemic absorption and stickiness nature, covalent linkage between the two was proposed. To this end the UV absorptive chromophore, benzophenone 3, was linked to triethoxysilyl monomer, producing 2-(hydroxyl-4-(3-triethoxysilylpropoxy))diphenylketone and then this monomer was polymerized together with tetraethyl orthosilicate into hybrid organic-silica particles.…”