Preparation and Properties Characterization of PDA/PVDF UV Shielding Composite Membranes

doi:10.7503/cjcu20180577

Abstract

Abstract:

Polydopamine(PDA) particles were fabricated via the self-polymerization of dopamine in the solution. Then PDA/PVDF(polyvinylidenefluoride) composite membranes with excellent ultraviolet(UV) shielding property were prepared through solution casting method using PDA particles as fillers. The chemical structure, morphology and absorbance of the as-prepared PDA particles were characterized by means of Fourier transform infrared spectroscopy(FTIR), scanning electron microscopy(SEM) and UV-Vis spectrophotometer. Furthermore, the structure, thermal property, wettability and UV shielding performance of the obtained PDA/PVDF composite membranes were confirmed by X-ray diffraction(XRD), differential scanning calorimetry(DSC), thermal gravimetric analyzer(TGA), water contact angle(CA) measurement and UV aging oven. The results displayed that the diameter of PDA particles were around 160 nm. The crystallinity and contact angle of the PVDF membranes became smaller after being modified with PDA particles. When the content of PDA was 5%, the UV transmittance of the as-obtained PDA/PVDF film decreased to less than 1% in the wavelength range of 200—400 nm. Consequently, the composite film could block all of the UV light, indicating the excellent ultraviolet shielding property.

Key words: Polyvinylidene fluoride, Polydopamine, Ultraviolet shielding, Composite membranes

TrendMD:

XIONG Zhengrong,DONG Li,LIU Xiangdong,YANG Yuming. Preparation and Properties Characterization of PDA/PVDF UV Shielding Composite Membranes[J]. Chem. J. Chinese Universities, 2019, 40(4): 849.

Figures/Tables 11

Fig.1 FTIR spectra of the PDA(a) and DOPA(b)

Fig.2 UV-Vis absorption spectrum of the PDA particles

Fig.3 SEM images of PDA particles with different magnifications

Fig.4 FTIR spectra of the pure PVDF film(a), PDA/PVDF composite films(b—d) and PDA particles(e)Mass fraction of PDA(%): a. 0; b. 1; c. 3; d. 5.

Fig.5 XRD patterns of the original PVDF film(a) and 3%PDA/PVDF composite film(b)

Fig.6 Wide scan XPS spectra of the original PVDF film(a) and 3%PDA/PVDF composite film(b)

Fig.7 UV-Vis transmittance spectra of the PDA/PVDF composite membranes with different PDA contentsMass fraction of PDA(%): a. 0; b. 1; c. 2; d. 3; e. 4; f. 5.

Fig.8 Influence of PDA contents on surface hydrophilicity of PVDF membranes

Fig.9 Photographs of the Rh B-doped PU films protected by pure PVDF film(A—F) and PDA/PVDF film(A'—F') after different time of UV irradiationIrradiation time/min: (A, A') 0; (B, B') 15; (C, C') 30; (D, D') 45; (E, E') 60; (F, F') 120.

Fig.10 TGA curves of the PDA/PVDF composite films, neat PVDF membrane and PDA a. PDA; b. 1%PDA/PVDF; c. 5%PDA/PVDF; d. PVDF.

Fig.11 DSC curves of the neat PVDF and PDA/PVDF composite filmsa. PVDF; b. 1%PDA/PVDF; c. 5%PDA/PVDF.

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