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Effect of Hydration on Silk Film Material Properties
Author(s) -
Lawrence Brian D.,
Wharram Scott,
Kluge Jonathan A.,
Leisk Gary G.,
Omenetto Fiorenzo G.,
Rosenblatt Mark I.,
Kaplan David L.
Publication year - 2010
Publication title -
macromolecular bioscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.924
H-Index - 105
eISSN - 1616-5195
pISSN - 1616-5187
DOI - 10.1002/mabi.200900294
Subject(s) - fibroin , water vapor , composite material , silk , materials science , chemistry , bound water , polymer chemistry , analytical chemistry (journal) , chromatography , organic chemistry , molecule
Effects of hydration on silk fibroin film properties were investigated for water‐annealed and MeOH‐treated samples. Hydration increased thickness by 60% for MeOH‐immersed films, while water‐annealed samples remained constant. MeOH‐immersed films showed an 80% mass loss due to water, while water‐annealed lost only 40%. O 2 permeability was higher in MeOH‐immersed films with Dk values of 10 −10 (mL O 2 · cm) · (cm −1 · s −1 · mmHg −1 ), while those of water‐annealed films reached only one fifth of this value. All films showed a decrease in Young's modulus and increased plastic deformation by two orders of magnitude when submerged in saline solution. FT‐IR showed that β ‐sheet content in water‐annealed films increased with increasing water vapor pressure, while MeOH‐immersed films showed no change.