Porous structures of polymer films prepared by spin coating with mixed solvents under humid condition
SCIE
SCOPUS
- Title
- Porous structures of polymer films prepared by spin coating with mixed solvents under humid condition
- Authors
- Park, MS; Joo, W; Kim, JK
- Date Issued
- 2006-05-09
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We investigate the effects of interfacial energy between water and solvent as well as polymer concentration on the formation of porous structures of polymer films prepared by spin coating of cellulose acetate butyrate (CAB) in mixed solvent of tetrahydrofuran (THF) and chloroform under humid condition. The interfacial energy between water and the solvent was gradually changed by the addition of chloroform to the solvent. At a high polymer concentration (0.15 g/cm(3) in THF), porous structures were limited only at the top surfaces of CAB films, regardless of interfacial energies, due to the high viscosity of the solution. At a medium concentration (similar to 0.08 g/cm(3) in THF), CAB film had relatively uniform pores at the top surface and very small pores inside the film because of the mixing of the water droplets with THF solution. When chloroform was added to THF, pores at the inner CAB film had a comparable size with those at the top surface because of the reduced degree of the mixing between the water droplets and the mixed solvent. A further decrease in polymer concentration (0.05 g/cm(3) in THF) caused the final films to have a two-layer porous structure, and the size of pores at each layer was almost the same.
- Keywords
- SELF-ORGANIZED HONEYCOMB; WET PHASE INVERSION; BREATH FIGURE; POLYSULFONE MEMBRANES; FLUID SURFACES; DRY; LITHOGRAPHY; ENVIRONMENT; FABRICATION; SEPARATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/24045
- DOI
- 10.1021/LA053009T
- ISSN
- 0743-7463
- Article Type
- Article
- Citation
- LANGMUIR, vol. 22, no. 10, page. 4594 - 4598, 2006-05-09
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