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首页> 外文期刊>Journal of Applied Polymer Science >Effect of Solvents on Morphology and Polymorphism of Polyvinylidene Fluoride Membrane via Supercritical CO_2 Induced Phase Separation
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Effect of Solvents on Morphology and Polymorphism of Polyvinylidene Fluoride Membrane via Supercritical CO_2 Induced Phase Separation

机译：超临界CO_2诱导相分离对聚偏氟乙烯膜形态和多态性的影响

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摘要

Poly vinylidene fluoride (PVDF) membranes were prepared via supercritical CO_2 induced phase separation. The effects of solvent power on PVDF membrane morphology and polymorphism were investigated using N-N-dimethylformamide (DMF), triethyl phosphate (TEP), and their mixture respectively. The morphology evolution including cross-section and surfaces were thoroughly studied by scanning electron microscope (SEM) and atomic force microscopy (AFM). The differences of solubility parameters between the solvent and PVDF affected the phase separation and the resultant morphology. The various crystalline phases of the membranes were mainly investigated by Fourier transform infrared spectroscopy (FTIR) and X-ray diffractometer (XRD). Solvent with larger dipole moment tended to form polar β phase. Decreasing the difference of solubility parameters favored the formation of α phase. Furthermore, the effects of salt additive on PVDF membrane morphology and crystalline form were studied as well. Results turned out that lithium chloride (LiCl) induced a porous top surface and boosted the formation of β phase.
机译：通过超临界CO_2诱导的相分离制备了聚偏二氟乙烯（PVDF）膜。分别使用N-N-二甲基甲酰胺（DMF），磷酸三乙酯（TEP）及其混合物研究了溶剂功率对PVDF膜形态和多态性的影响。通过扫描电子显微镜（SEM）和原子力显微镜（AFM）深入研究了包括横截面和表面在内的形貌演变。溶剂和PVDF之间的溶解度参数差异会影响相分离和最终的形貌。膜的各种晶相主要通过傅里叶变换红外光谱（FTIR）和X射线衍射仪（XRD）研究。偶极矩较大的溶剂倾向于形成极性β相。减小溶解度参数的差异有利于α相的形成。此外，还研究了盐添加剂对PVDF膜形态和晶形的影响。结果表明，氯化锂（LiCl）诱导了多孔顶表面并促进了β相的形成。

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