Fabrication of Hollow TiO2 Spheres and Effect on Properties of Polyacrylate Film†

doi:10.7503/cjcu20170258

Abstract

Abstract:

Hollow TiO₂ spheres were prepared using cationic polystyrene microspheres as templates, tetrabutyl titanate as titanium source and ammonia as catalyst. The morphology and structure were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller analysis. The influence of template size, titanium source and catalyst dosage on the morphology of hollow TiO₂ spheres were studied. Then, the hollow TiO₂ spheres were introduced into polyacrylate emulsion by physical blending method. The thermal insulation, UV-shielding and mechanical performance of composite films were investigated. As a result, the anatase phase hollow TiO₂ spheres were obtained. The hollow size, thickness and compactness of the shell of hollow TiO₂ spheres were influenced by the template size, titanium source and catalyst dosage. Hollow TiO₂ spheres as filler can enhance the thermal insulation, UV-shielding and mechanical performance of polyacrylate film, significantly. At the same time, it was proved that the hollow TiO₂ spheres prepared with different size templates have effects on the performance of the composite films. In which, the properties of the composite film containing the hollow TiO₂ spheres prepared with template of 140 nm was optimal. The reflectivity was improved about 62.2%, the thermal conductivity was decreased by 17.71%, and the ultraviolet transmittance was almost zero under 390 nm wavelength.

Key words: Hollow TiO2 sphere, Polyacrylate, Thermal insulation property, Anti-ultraviolet property, Mechanical property

CLC Number:

O631
O614.41

TrendMD:

BAO Yan, GAO Min, DONG Yufei, KANG Qiaoling, GAO Zhipeng, WU Guodong, LI Yan. Fabrication of Hollow TiO₂ Spheres and Effect on Properties of Polyacrylate Film^†[J]. Chem. J. Chinese Universities, 2017, 38(12): 2328.

Figures/Tables 15

Scheme 1 Schematic of the preparation of hollow TiO2 microspheres via template-method

Fig.1 SEM images of PS(A), PS/TiO2(B) and hollow TiO2 spheres(C)

Fig.2 XRD pattern of hollow TiO2 spheres

Fig.3 N2 adsorption-desorption isotherm(A) and BJH pore size distribution(B) of hollow TiO2 spheres

Fig.4 SEM images of hollow TiO2 spheres using PS microspheres with different particle sizes as templatesParticle size/nm: (A) 40; (B) 140; (C) 190; (D) 270; (E) 350.

Fig.5 SEM images of hollow TiO2 spheres with different contents of TBT Mass fraction of TBT(%): (A) 0.43; (B) 0.63; (C) 0.83; (D) 1.04; (E) 1.25.

Fig.6 SEM images of hollow TiO2 spheres with different contents of ammonium hydroxide Content of ammonium hydroxide/mmol: (A) 0; (B) 34; (C) 68; (D) 136; (E) 272.

Fig.7 TEM images of pure polyacrylate latex(A) and PA/hollow TiO2 spheres composite latex(B)

Fig.8 SEM images of polyacrylate film(A), polyacrylate/hollow TiO2 spheres composite film of high(B) and low magnification(C)

Fig.9 Light reflectivities of PS spheres, PS/TiO2 spheres and hollow TiO2 spheres(A) and their composite films(B)a. PS spheres; b. PS/TiO2 spheres; c. hollow TiO2 spheres; d. pure polyacrylate film.

Fig.10 Thermal conductivities of PS spheres, PS/TiO2 spheres, hollow TiO2 spheres(A) and their composite films(B)a. PS spheres; b. PS/TiO2 spheres; c. hollow TiO2 spheres; d. pure polyacrylate film.

Fig.11 Light transmittance(A) and mechanical properties(B) of composite films a. PS spheres; b. PS/TiO2 spheres; c. hollow TiO2 spheres; d. pure PA.

Fig.12 Light reflectivities of hollow TiO2 spheres using PS microspheres with different particle sizes as templates(A) and their composite films(B)a—e. hollow TiO2 spheres using PS microspheres of 40 nm, 140 nm, 190 nm, 270 nm, 350 nm as templates and their composite films, respectively; f. pure polyacrylate film.

Fig.13 Thermal conductivities of hollow TiO2 spheres using PS microspheres with different particle sizes as templates(A) and their composite films(B)a—e. Hollow TiO2 spheres using PS microspheres of 40, 140, 190, 270 and 350 nm as templates and their composite films, respectively; f. pure PA.

Fig.14 Light transmittance(A) and mechanical properties(B) of composite films containing hollow TiO2 spheres using PS microspheres with different particle sizes as templatesa—e. Composite films containing hollow TiO2 spheres using PS microspheres of 40, 140, 190, 270 and 350 nm as templates, respectively; f. pure PA.

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Fabrication of Hollow TiO₂ Spheres and Effect on Properties of Polyacrylate Film^†

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