Premium
Effects of the incorporation of saturated fatty acids on the mechanical and barrier properties of biodegradable films
Author(s) -
Nobrega Marcelo Medre,
Olivato Juliana Bonametti,
Grossmann Maria Victoria Eiras,
Bona Evandro,
Yamashita Fabio
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.35250
Subject(s) - lauric acid , elongation , glycerol , materials science , degree of unsaturation , chemical engineering , homogeneous , modulus , chemistry , starch , relative humidity , fatty acid , polymer chemistry , organic chemistry , composite material , ultimate tensile strength , thermodynamics , physics , engineering
The effects of saturated fatty acids at a concentration of 1.5% on the mechanical and barrier properties of starch‐based films were evaluated in films prepared with two concentrations of glycerol, 20 and 25%. The water vapor permeability (WVP) was determined at three ranges of relative humidity, RH, (0–33, 33–64 and 64–97%). In all cases, an increase in WVP values was observed with increasing RH. SEM images showed a more homogeneous and compact structure in the films with caproic and lauric acids. The films with fatty acids showed higher elongation and maximum stress, and they had Young's modulus values close to those of the control; thus, the addition of fatty acids did not impair the mechanical properties. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012