Controlled deposition of structured polymer films : chemical and rheological factors in chitosan film formation

Date
2012-05
Authors
Maloy, Sedef Fiona
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[Honolulu] : [University of Hawaii at Manoa], [May 2012]
Abstract
The technique of spread-coating was utilized to create thin films of chitosan polymer. The effect of deposition rate on film thickness was characterized for solutions of deacetylated and butyl-modified chitosan. For the range of deposition rates analyzed, the relationship between film thickness and increasing deposition rate fell into three distinct regions: an initial inverse relationship, a second linearly increasing relationship, and a final region wherein the film thickness remained constant. Results suggest that film thickness was both controllable and reproducible and that hydrophobic modification of the polymer extends the range over which a linear relationship between film thickness and deposition rate is achieved. Viscometry and fluorescence spectroscopy were employed to characterize the micellar characteristics of solutions of both deacetylated and butyl-modified chitosan. Deacetylated chitosan solutions possessed more interconnected hydrophobic domains that had more intermolecular micellar characteristics, while butyl-modified chitosan solutions had more intramolecular micellar characteristics and less interconnected hydrophobic domains.
Description
M.S. University of Hawaii at Manoa 2012.
Includes bibliographical references.
Keywords
Chitosan and modified chitosan, polymer films, spread-coat, micellar structure
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