PDA/PVDF紫外线屏蔽复合膜的制备及性能表征

doi:10.7503/cjcu20180577

摘要/Abstract

摘要：

利用多巴胺在溶液中自聚得到聚多巴胺(PDA)颗粒, 然后将其作为填料加入聚偏氟乙烯(PVDF)中, 采用溶液成膜法制备具有紫外线屏蔽功能的PDA/PVDF复合膜. 通过傅里叶变换红外光谱(FTIR)、扫描电子显微镜(SEM)和紫外可见分光光度计(UV-Vis)对制备的PDA颗粒的结构、形貌以及吸光度进行表征, 并且进一步利用X 射线衍射仪(XRD)、差示扫描量热仪(DSC)、热失重分析仪(TGA)、接触角测量仪(CA)以及紫外老化箱等对PDA/PVDF复合膜的结构、热性能、润湿性能与紫外线屏蔽性能进行测试. 结果表明, 制备的PDA颗粒的粒径约为160 nm; 掺杂PDA之后的PVDF膜的结晶度以及接触角均减小; 并且PDA质量分数为5%时得到的PDA/PVDF复合膜在200400 nm范围内的透过率均低于1%, 能够吸收所有的紫外线, 表现出优异的紫外线屏蔽功能.

关键词: 聚偏氟乙烯, 聚多巴胺, 紫外线屏蔽, 复合膜

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:

熊征蓉, 董莉, 刘向东, 杨宇明. PDA/PVDF紫外线屏蔽复合膜的制备及性能表征. 高等学校化学学报, 2019, 40(4): 849.

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

图/表 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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