Polymorphism in porous poly(vinylidene fluoride) membranes formed via immersion precipitation process
Polymorphism in porous poly(vinylidene fluoride) membranes formed via immersion precipitation process
复制标题
通过浸没沉淀法形成的多孔聚偏二氟乙烯膜的多晶型现象
DOI：
10.1016/j.memsci.2008.03.029
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发表时间：
2008-07
影响因子：
9.5
通讯作者：
中科院分区：
文献类型：
--
作者：
以聚偏氟乙烯(PVDF) /二甲基亚砜(DMSO)/水为原料，采用浸没沉淀法制备了多孔聚偏氟乙烯（PVDF）膜。通过控制浇注液中PVDF的浓度和沉淀温度，研究了形成的多孔膜的多态性。用场发射扫描电镜（FESEM）观察了膜的形态，用差示扫描量热法（DSC）检测了膜的热行为。采用广角x射线衍射（WAXD）和傅里叶变换红外光谱-衰减全反射（FTIR-ATR）分析了全膜和表层的晶体结构。结果表明，PVDF在全膜中主要结晶为α型晶体结构，而在表层中α和β相共存。随着浇注液中PVDF浓度的升高或沉淀温度的降低，膜的总结晶度和表层的β/α相比同时升高。
Porous poly(vinylidene fluoride) (PVDF) membranes were prepared via immersion precipitation process from PVDF/dimethyl sulfoxide (DMSO)/water system. By manipulating precipitation temperature and PVDF concentration in casting solution, the polymorphism in the formed porous membranes was studied. Membrane morphologies were observed by field emission scanning electron microscopy (FESEM) and thermal behaviors of membranes were examined by differential scanning calorimetry (DSC). Wide angle X-ray diffraction (WAXD) and Fourier transform infrared spectroscopy-attenuated total reflection (FTIR-ATR) were employed to analyze the crystalline structures of the overall membranes and the surface layers. It was found that, for all the investigated cases, PVDF mainly crystallized into the α form crystalline structure in the overall membrane, while the α and β phases coexisted in the surface layers. The total crystallinity of the membrane and the β/α phase ratio in the surface layers increased simultaneously while raising PVDF concentration in casting solution or reducing precipitation temperature.
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DOI：
10.1063/1.3034675
发表时间：
1968-10
期刊：
--
影响因子：
--
作者：
N. Harrick;Joseph G. Hoffman
通讯作者：
N. Harrick;Joseph G. Hoffman
影响因子：
4.6
作者：
D. Lin;Cheng-Liang Chang;Fane-Ming Huang;L. Cheng
通讯作者：
D. Lin;Cheng-Liang Chang;Fane-Ming Huang;L. Cheng
影响因子：
9.5
作者：
Hester, JF;Mayes, AM
通讯作者：
Mayes, AM
影响因子：
9.5
作者：
BOTTINO, A;CAMERARODA, G;MUNARI, S
通讯作者：
MUNARI, S
影响因子：
3
作者：
Gregorio, R
通讯作者：
Gregorio, R