研究了不同聚合物浓度铸膜液体系DMAc/H2O/PVDF的热力学性质、沉淀速度以及膜的结构,利用两步成膜机理探讨了PVDF体系的成膜机理.结果显示,皮层分相主要由体系热力学性质控制,当PVDF浓度逐渐增加时,PVDF结晶化作用越来越重要,皮层分相由瞬时液液分相逐渐转化为延时液固分相,膜上表面由多孔结构变成致密结构.亚层的分相由动力学扩散过程控制,分相时间由动力学扩散和体系热力学性质共同控制,随PVDF浓度的增加,结晶化作用增强,DMAc和H2O相互扩散速度减小,分相时间延长,使得亚层由瞬时液液分相转变为延时液液分相,膜亚层指状大孔结构减少海绵状孔结构增多,膜的结晶度提高.
参考文献
| [1] | Tai-Horng Young;Liao-Ping Cheng;Dar-Jong Lin;Ling Fane;Wen-Yuan Chuang .Mechanisms of PVDF membrane formation by immersion-precipitation in soft (1-octanol) and harsh (water) nonsolvents[J].Polymer: The International Journal for the Science and Technology of Polymers,1999(19):5315-5323. |
| [2] | Tai-Horng Young;Dar-Jong Lin;Jy-Jye Gau;Wen-Yuan Chuang;Liao-Ping Cheng .Morphology of crystalline Nylon-610 membranes prepared by the immersion-precipitation process: competition between crystallization and liquid-liquid phase separation[J].Polymer: The International Journal for the Science and Technology of Polymers,1999(18):5011-5021. |
| [3] | 陆茵,陈欢林,李伯耿.添加剂对PVDF相转化过程及膜孔结构的影响[J].高分子学报,2002(05):656-661. |
| [4] | Yao C W;Burford R P;Fane A G et al.Effect of coagulation conditions on structure and properties of membranes from aliphatic polyamides[J].Journal of Membrane Science,1988,38:113-125. |
| [5] | Machado P.S.T.;Borges C.P.;Habert A.C. .Membrane formation mechanism based on precipitation kinetics and membrane morphology: Flat and hollow fiber polysulfone membranes[J].Journal of Membrane Science,1999(2):171-183. |
| [6] | Dongliang Wang;K. Li;WK. Teo .Porous PVDF asymmetric hollow fiber membranes prepared with the use of small molecular additives[J].Journal of Membrane Science,2000(1/2):13-23. |
| [7] | 王保国;刘茂林;蒋维钧 .中空纤维聚偏氟乙烯微孔膜研究[J].膜科学与技术,1995,15(01):46-50. |
| [8] | Young T H;Chen L W .A two step mechanism of diffusion-controlled ethylene vinyl alcohol membrane formation[J].Journal of Membrane Science,1991,57:69-81. |
| [9] | Li SG.;Smolders CA.;Strathmann H.;Vandenboomgaard T. .PHYSICAL GELATION OF AMORPHOUS POLYMERS IN A MIXTURE OF SOLVENT AND NONSOLVENT[J].Macromolecules,1996(6):2053-2059. |
| [10] | 王连军,李恕广,江成璋.PES制膜体系凝胶时间的研究[J].膜科学与技术,2001(03):16-20. |
| [11] | 王连军,李恕广,江成璋.PES制膜体系亚层形成机理的研究[J].膜科学与技术,2001(01):4-10. |
| [12] | Tai-Hong Young;Liao-Ping Cheng;Wei-Ming You;Li-Yen Chen .Prediction of EVAL membrane morphologies using the phase diagram of water-DMSO-EVAL at different temperatures[J].Polymer: The International Journal for the Science and Technology of Polymers,1999(9):2189-2195. |
| [13] | Kimmerle K;Strathmarm H .Analysis of the structuredetermining process of phase inversion membranes[J].Desalitation,1990,79:283-293. |
| [14] | Smolders C A;Reuvers A J;Boom R M et al.Microstrucuture in phase inversion membrane (Ⅰ) Formation of macrovoids[J].Journal of Membrane Science,1992,73:259-275. |
| [15] | 陆茵 .关于湿法相转化成膜机理的探讨[J].膜科学与技术,1999,19(05):38-43. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%