Citation:
Tan Wenyuan, Chen Yuqin, Su Rui, Huang Kanghui, Wang Zhuqing. Preparation and Characterization of PVDF Hydrophilic Composite Membrane[J]. Chemistry,
;2020, 83(2): 156-160.
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The strong hydrophobicity of polyvinylidene fluoride (PVDF) membrane materials is its main drawback, and hydrophilization modification is the main way to solve this problem. The PVDF/PVA composite membrane was prepared by phase inversion method using PVDF as the base material, polyvinyl alcohol (PVA) as the blending material and N, N-dimethylacetamide (DMAc) as the solvent. The effects of blending ratio of PVDF/PVA, solid content, small molecule additives and polymer additives on the contact angle of the composite film were investigated. The results showed that when the PVDF/PVA blending ratio is 7/3 and the solid content is 13%, the contact angle of the prepared composite membrane is 22.92°; when the additive is anhydrous lithium chloride, nano-silica, and PVP, the contact angle of the composite film is reduced from 53.12°, 30.51° and 41.89° to 0°, respectively. The composite film has the best hydrophilicity when nano-silica is used as an additive. When the additive is glycerin, PMMA, PEG, the contact angle of the composite film increases, and the hydrophilicity deteriorates.
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Keywords:
- PVDF membrane,
- PVA,
- Blending,
- Hydrophilicity,
- Modification
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