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- Title
PVC∕PVDC 共混膜的制备及其性能.
- Authors
周榆凯; 钱建华; 杨晶晶; 徐凯杨; 梅 敏
- Abstract
Polyvinyl chloride PVC is one of the main membrane materials in modern times. It has excellent acid and alkali resistance microbial resistance high mechanical strength low price and other advantages and is widely used in ultrafiltration nanofiltration and other fields. However the film forming performance of PVC is not very ideal the water flux is low and the toughness is insufficient so it is easy to shrink and wrinkle spontaneously when gel is used. Therefore the PVC film needs to be modified by blending to improve its performance. Polyvinylidene chloride PVDC has good film forming property good mechanical properties thermal stability and chemical resistance. Therefore blending PVC and PVDC can make the film have both advantages. In addition due to the poor hydrophilicity of PVC and PVDC polyethylene glycol PEG can be used as an additive to modify the blend membrane which can improve its hydrophilicity pollution resistance and pure water flux. In order to investigate the preparation and properties of polyvinyl chloride PVC ∕poly vinylidene chloride PVDC blend membranes N N-Dimethylacetamide DMAC was used as solvent to prepare PVC∕PVDC blend membranes by phase inversion method. The compatibility of PVC∕PVDC blend system the surface morphology and cross-sectional morphology of blend membranes as well as the effects of blend ratio and polyethylene glycol PEG mass fraction on pure water flux rejection dynamic contact angle and flux recovery were studied. At present a lot of studies on the blending modification of PVC membranes have been done at home and abroad but the study on the modification of PVC membranes with PVDC has not been reported yet. The results show that when the blending ratio is 4 ∕6 the overall performance of the blend membrane is the best the pure water flux is 212. 9 L/(m²·h) and the rejection rate of bovine serum albumin BSA is 88. 5% under the pressure of 0. 1 MPa. The optimum mass fraction of PEG is 6% and at this time the pure water flux is 336. 6 L/(m²·h) the interception rate is 81. 6% the instantaneous contact angle decreases from 81. 1° to 74. 5° and the recovery flux rate increases from 52. 7% to 85. 7% . The results show that PEG can effectively improve the hydrophilicity and anti-protein pollution ability of the blend membrane. In this paper PVC∕PVDC blend membranes are prepared by phase inversion method. The compatibility of PVC∕PVDC blend systems is analyzed and discussed by measuring the shear viscosity of solutions with different blend ratios. At the same time the surface and section microstructures of PVC∕PVDC blend membranes are observed by field emission scanning electron microscopy SEM and the contact angle pure water flux and flux recovery rate and the interception rate of bovine serum albumin BSA are tested to determine the optimal blend ratio. On this basis the influence of PEG mass fraction on the performance of the blend membrane is studied to determine the optimal PEG content which provides some directions for the material selection and modification of PVC blend membranes and endows them with a broader market prospect in water treatment and sewage treatment.
- Publication
Advanced Textile Technology, 2023, Vol 31, Issue 1, p145
- ISSN
1009-265X
- Publication type
Article
- DOI
10.19398∕j.att.202206032