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Soy Protein Isolate Based Films: Influence of Sodium Dodecyl Sulfate and Polycaprolactone‐triol on Their Properties
Author(s) -
Schmidt Vanessa,
Giacomelli Cristiano,
Soldi Marly S.,
Soldi Valdir
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200551115
Subject(s) - polycaprolactone , sodium dodecyl sulfate , soy protein , materials science , chemical engineering , triol , chemistry , polymer chemistry , chromatography , composite material , polymer , diol , biochemistry , engineering
Summary: We report on the preparation and properties of soy protein isolate (SPI)‐sodium dodecyl sulfate (SDS)‐polycaprolactone‐triol (PCL‐T) films obtained by solvent casting from solutions containing variable amounts of SDS or SDS/PCL‐T. It is shown that the mechanical and thermal properties, and the morphology of SPI‐based biofilms can be easily controlled by changing SDS, PCL‐T, and moisture contents, enabling the fabrication of rigid and flexible materials as pure SPI films [Young's modulus ∼ 1 400 MPa, elongation at break ( E ) ∼ 2%, and glass transition temperature ( T g ) ∼ 150 °C] and SPI/SDS/PCL‐T films with [PCL‐T] ≥ 18% (Young's modulus ∼ 50 MPa, E ∼ 90%, and T g ∼ 135 °C), respectively. Micrographs taken at the cross‐section of biofilms whose [PCL‐T] ≥ 18% revealed the occurrence of a porous matrix, whereas a dense bulk phase was otherwise observed (pure SPI, SPI/SDS, and SPI/SDS/PCL‐T films with [PCL‐T] < 18%).