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Clusters of starch‐g‐PCL and their effect on the physicochemical properties of films
Author(s) -
RamírezHernández Aurelio,
AparicioSaguilán Alejandro,
MataMata José L.,
GonzálezGarcía Gerardo,
HernándezMendoza Héctor,
BáezGarcía Eduardo,
CondeAcevedo Carlos
Publication year - 2018
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201700135
Subject(s) - crystallinity , starch , fourier transform infrared spectroscopy , chemical engineering , scanning electron microscope , aqueous solution , materials science , degradation (telecommunications) , hydrolysis , nuclear chemistry , chemistry , polymer chemistry , composite material , organic chemistry , telecommunications , computer science , engineering
Starch‐g‐PCL films were prepared using the casting method and were characterized by different instrumental techniques and physicochemical properties. Nuclear magnetic resonance and Fourier transform infrared spectroscopy led to the proposal of a chemical structure for the films. The scanning electron microscopy (SEM) images of the films showed the formation of clusters of the graft copolymer starch‐g‐PCL. The effects of these clusters on the crystallinity (X‐ray powder diffraction) revealed that the crystalline zones of the films increased by 46% and the elongation percentage increased by up to 50%. Also, the chemical degradation (aqueous hydrolysis) and the soil degradation of these films were 1.9 and 2.6 times faster than the films of starch alone. However, the thermal degradation temperature of the films decreased by more than 15°C, the moisture content decreased to 6.5%, and the water vapor permeation values increased in the films that contained starch‐g‐PCL. These results were accentuated with the increase in the amount of starch‐g‐PCL clusters.