| 氯化锂对聚偏氟乙烯多孔膜的亲水改性 |
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| 引用本文： | 裴丽霞,张立志.氯化锂对聚偏氟乙烯多孔膜的亲水改性[J].东南大学学报,2010,26(2):201-204. |
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| 作者姓名： | 裴丽霞 张立志 |
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| 作者单位： | 裴丽霞(华南理工大学强化传热与过程节能教育部重点实验室,广州,510640);张立志(华南理工大学化学与化学工程学院,广州,510640) |
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| 基金项目： | The National Natural Science Foundation of China（No.50676034）; the National High Technology Research and Development Program of China（863 Program）（No.2008AA05Z206） |
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| 摘 要： | 利用相分离法制备了亲水性聚偏氟乙烯（PVDF）-氯化锂共混膜,通过接触角测量和水蒸气吸附实验评价了膜的亲水性,并通过水蒸气渗透实验测试了总传质系数和水蒸气渗透速率.实验结果表明：随着铸膜液中氯化锂含量的增加,PVDF膜的接触角明显降低,同时,PVDF膜对水蒸气的吸附能力随之增加.当氯化锂质量分数低于2.5%时,水蒸气在膜中的总传质系数略有增加,当氯化锂质量分数高于2.5%时,总传质系数明显增加,而水蒸气在膜中渗透速率随氯化锂含量的增加而增加.因此,氯化锂的加入可以显著提高PVDF膜的亲水性,进而增强水蒸气的渗透性能.
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| 关 键 词： | PVDF多孔膜 氯化锂 亲水性 除湿 |
Improvement of hydrophilicity of porous PVDF membranes with LiCl additives |
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| Pei Lixia Zhang Lizhi.Improvement of hydrophilicity of porous PVDF membranes with LiCl additives[J].Journal of Southeast University(English Edition),2010,26(2):201-204. |
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| Authors: | Pei Lixia Zhang Lizhi |
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| Institution: | Pei Lixia Zhang Lizhi(Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education,South China University of Technology,Guangzhou 510640,China)(School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510640,China) |
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| Abstract: | Porous polyvinylidene fluoride（PVDF）membranes blended with LiCl are prepared through the phase inversion method to obtain a good support layer for air dehumidification.The hydrophilicity of the resulting membrane is evaluated by water contact angle measurements and vapor adsorption tests.The moisture permeation performance of the membrane is measured by permeation tests in terms of total mass transfer coefficients and moisture permeability rates.It is found that water contact angles and water vapor adsorption capacities increase with the increasing LiCl content in the casting solution.As the LiCl content increases,the total mass transfer coefficient increases slightly at a low LiCl content（below 2.5%）and then improves greatly at a high LiCl content（above 2.5%）,whereas the moisture permeation rate increases.The results demonstrate that LiCl can remarkably improve the hydrophilicity of PVDF membranes,and then greatly enhance moisture permeation performance. |
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| Keywords: | porous polyvinylidene fluoride membranes LiCl hydrophilicity dehumidification |
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