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TiO2–SiO2 composite nanoparticles containing hindered amine light stabilizers encapsulated by MMA–PMPM copolymers

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Abstract

TiO2–SiO2 composite nanoparticles containing hindered amine light stabilizers (HALSs) were prepared by encapsulation of commercially available TiO2–SiO2 nanoparticles using methyl methacrylate (MMA) and 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate (PMPM) copolymers through mini-emulsion polymerization. The Fourier transform infrared spectral analysis (FTIR) showed that the hindered amine light stabilizer PMPM was incorporated into the TiO2–SiO2/P(MMA-co-PMPM) composite nanoparticles. The X-ray photoelectron spectroscopy analysis (XPS) showed that the surface of TiO2–SiO2 nanoparticles was enriched with HALS moieties. The formation of P(MMA-co-PMPM) random copolymers on the surface of TiO2–SiO2 nanoparticles was determined by differential scanning calorimetry (DSC), and the percentage of the chemically grafted P(MMA-co-PMPM) coverage on the TiO2–SiO2 nanoparticles surface was 40.9 wt% determined by thermogravimetric analysis (TGA), which revealed that the TiO2–SiO2 nanoparticles were successfully encapsulated by MMA–PMPM copolymers. Scanning electron microscopy analysis indicated that the TiO2–SiO2/P(MMA-co-PMPM) composite nanoparticles were mainly homogeneous spherical shape particles, with an average size of about 90 nm. Rhodamine B (Rh.B) photocatalytic degradation study revealed UV-shielding characteristics for TiO2–SiO2/P(MMA-co-PMPM) composite nanoparticles and showed a remarkable decrease in photocatalytic activity of TiO2–SiO2 nanoparticles. These results indicated that TiO2–SiO2/P(MMA-co-PMPM) composite nanoparticles may be promising light stabilizers with covalent functionalization of polymeric HALS, which has little photocatalytic activity, and can be introduced into the weathering-resistant polymer materials to improve their application properties.

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Acknowledgements

The authors greatly appreciate the financial support of this Project by the Natural Science Foundation of Hebei Province (B2017202028).

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  1. Institute of Polymer Science and Engineering, Hebei University of Technology, Tianjin, 300130, China

    Feng Liu & Guodong Liu

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  1. Feng Liu
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Correspondence to Guodong Liu.

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Liu, F., Liu, G. TiO2–SiO2 composite nanoparticles containing hindered amine light stabilizers encapsulated by MMA–PMPM copolymers. Iran Polym J 26, 785–795 (2017). https://doi.org/10.1007/s13726-017-0564-7

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  • DOI: https://doi.org/10.1007/s13726-017-0564-7

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