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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Effect of solvent power on PVDF membrane polymorphism during phase inversion
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Effect of solvent power on PVDF membrane polymorphism during phase inversion

机译：溶剂功率对相转化过程中PVDF膜多态性的影响

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摘要

Polyvinylidene fluoride (PVDF) membranes were prepared via the phase inversion method. The focus of this paper was put on the effects of four specific solvents with different solubility power including hexamethylphosphoramide (HMPA), trimethylphosphate (TMP), N,N-dimethylformamide (DMF) and triethylphosphate (TEP) on membrane polymorphism. Polymorphism of PVDF membranes was analyzed by wide-angle X-ray diffraction (WAXD), Fourier transform infrared spectroscopy (FTIR), Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) respectively. All results revealed that the dissolution of PVDF in different solvents had a great influence on the membrane crystalline phase. The well dissolved PVDF solution tended to form β phase during phase inversion process while the poorly dissolved PVDF solution favored the formation of β phase. Furthermore, a soft coagulation bath was used during the phase inversion process to enhance the filtration permeability of the PVDF membranes. The fouling resistance to protein and mechanical properties of the membranes were also investigated.
机译：聚偏氟乙烯（PVDF）膜是通过相转化法制备的。本文的重点放在四种溶解度不同的特定溶剂上，包括六甲基磷酰胺（HMPA），三甲基磷酸酯（TMP），N，N-二甲基甲酰胺（DMF）和磷酸三乙酯（TEP）对膜多态性的影响。通过广角X射线衍射（WAXD），傅里叶变换红外光谱（FTIR），傅里叶变换红外光谱-衰减全反射率（FTIR-ATR），扫描电子显微镜（SEM）和差示扫描量热法分析了PVDF膜的多态性（DSC）。所有结果表明，PVDF在不同溶剂中的溶解对膜晶相有很大影响。溶解度好的PVDF溶液在相转化过程中倾向于形成β相，而溶解度差的PVDF溶液则有利于β相的形成。此外，在相转化过程中使用了软凝浴，以提高PVDF膜的过滤渗透性。还研究了膜对蛋白质的防污性和机械性能。

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