Document Detail

Porous structures of polymer films prepared by spin coating with mixed solvents under humid condition.
MedLine Citation:
PMID:  16649769     Owner:  NLM     Status:  MEDLINE    
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/cm3 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 (approximately 0.08 g/cm3 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/cm3 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.
Min Soo Park; Wonchul Joo; Jin Kon Kim
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  22     ISSN:  0743-7463     ISO Abbreviation:  Langmuir     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-02     Completed Date:  2007-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4594-8     Citation Subset:  IM    
National Creative Research Center for Block Copolymer Self-Assembly, Department of Chemical Engineering and Polymer Research Institute, Pohang University of Science and Technology, Kyungbuk 790-784, Korea.
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MeSH Terms
Cellulose / analogs & derivatives,  chemistry
Chloroform / chemistry
Furans / chemistry
Microscopy, Electron, Scanning
Polymers / chemistry*
Solvents / chemistry*
Surface Properties
Surface Tension
Water / chemistry
Reg. No./Substance:
0/Furans; 0/Polymers; 0/Solvents; 67-66-3/Chloroform; 7732-18-5/Water; 9004-34-6/Cellulose; 9004-36-8/cellulose acetate-butyrate

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