| 凝固浴温度对PVDF铸膜液相分离过程和膜结构的影响 |
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| 引用本文： | 左丹英,徐又一,刘洪涛.凝固浴温度对PVDF铸膜液相分离过程和膜结构的影响[J].功能高分子学报,2008,21(4):380-384,416. |
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| 作者姓名： | 左丹英 徐又一 刘洪涛 |
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| 作者单位： | 1. 武汉科技学院新型纺织材料绿色加工及其功能化教育部重点实验室,武汉,430073
2. 浙江大学高分子科学研究所,杭州,310027 |
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| 摘 要： | 采用皮-亚两步凝胶成膜机理探讨了凝固浴温度对PVDF铸膜液的相分离行为及其膜结构的影响.采用浊度法测定不同温度时铸膜液体系的热力学性质,光透射仪测定不同凝固浴温度时沉淀速率对膜的形态和性能的影响.结果显示:皮层的生成主要受热力学性质控制,随着凝固浴温度的提高,皮层由液固分相转变为液液分相,延时时间缩短,皮层由相互融合的球粒致密结构转变为多孔结构.亚层的生成主要受皮层结构和溶剂/非溶剂相互扩散的影响,膜亚层主要发生液液分相;随凝固浴温度升高,分相速率加快,大孔发展更充分,膜的孔隙率和气通量提高,但结晶度降低.
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| 关 键 词： | PVDF非对称膜 皮-亚层两步凝胶成膜机理 相分离 |
Influences of the Coagulation Bath Temperature on Phase Separation of PVDF Casting Solution and Membrane Structure |
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| ZUO Dan-ying,XU You-yi,LIU Hong-tao.Influences of the Coagulation Bath Temperature on Phase Separation of PVDF Casting Solution and Membrane Structure[J].Journal of Functional Polymers,2008,21(4):380-384,416. |
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| Authors: | ZUO Dan-ying XU You-yi LIU Hong-tao |
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| Institution: | ZUO Dan-ying1,XU You-yi2,LIU Hong-tao1(1.Key Laboratory for Green Processing , Functional Textile of New Textile Materials,Ministry of Education,Wuhan University of Science , Engineering,Wuhan 430073,China,2.Institute of Polymer Science,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | The phase separation and the membrane formation of PVDF casting solutions in water bath at different temperatures were discussed with the skin-sublayer two steps precipitations mechanism.The casting solutions thermodynamics at different temperatures and the membrane-forming kinetic precipitation in water bath under different temperatures were investigated via cloud point determination and light transmittance measurement.Membrane morphology and performances were characterized.It is found that the skin layer ... |
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| Keywords: | PVDF asymmetrical membrane skin-sublayer two steps precipitations phase separation |
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