提出了拉伸逼近法对PES-NMP制膜体系凝胶时间的定量研究.考察了铸膜液条件、凝胶条件对凝胶时间的影响.研究发现,成膜过程中的凝胶时间随膜液高分子浓度的增加而增加;随膜液中非溶剂含量的增加而减少;随凝胶液中的溶剂含量增加而增大,并且这种增长在一定范围内出现突跃.这种突跃表明膜液的凝胶过程不仅受传质交换速率控制还可能受其他因素影响.与延迟分相时间的比较实验揭示了:无论对延迟分相体系或是对瞬间分相体系,成膜过程中的凝胶时间远大于延迟分相时间.说明膜结构不仅取决于分相动力学,也取决于凝胶动力学.
参考文献
| [1] | 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. |
| [2] | Wijmans J G;Kant J;Mulder M H V et al.Phase separation phenomena in solutions of polysulfone in mixtures of solvent and a nonsolvent:Relation with membrane formation[J].Polymer,1985,26:1539-1545. |
| [3] | Kimmerle K;Strathmann H .Analysis of the structure-determining process of phase inversion membranes[J].DESALINATION,1990,79:283-302. |
| [4] | Gaides B E;McHugh A J .Gelation in a amorphous polymer:A discussion of its relation to membrane formation[J].Polymer,1989,30:2118-2123. |
| [5] | Guen;Lotz B;Wittmann J G .Thermodynamic aspects and morphology of physics gels from Isotactic polystyrene[J].Macromolecules,1985,18:420-427. |
| [6] | Somszy R C;Alamo R;Edwards C O et al.Thermoreversible gelation and crystallization of homopolymers and copolymers[J].Macromolecules,1986,19:310-325. |
| [7] | Arnauts J;Berghamans H .Amorphous thermoreversible gels of atactic polystyrene[J].Polymer Communications,1987,28:66-68. |
| [8] | Reuvers A J;van den Berg J W A;Smolders C A .Formation of membranes by means of immersion precipitation Part I A model to describe mass transfer during immersion precipitation[J].Journal of Membrane Science,1987,34:45-65. |
| [9] | Reuvers A J;Smolders C A .Formation of membranes by means of immersion precipitation Part Ⅱ The mechanism of formation of membranes prepared from the system cellulose acetate-acetone-water[J].Journal of Membrane Science,1987,34:67-86. |
| [10] | Cheng LP.;You WM.;Young TH. .Formation of crystalline EVAL membranes by controlled mass transfer process in water-DMSO-EVAL copolymer systems[J].Journal of Membrane Science,1998(1):77-90. |
| [11] | 何涛,江成璋.聚醚砜微孔膜制备中非溶剂添加剂作用研究[J].膜科学与技术,1998(03):43-48. |
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%