Open AccessPhysical and mechanical properties of starch films: the role of the cross-linking mechanism through iodine binding capacity
Author(s) -
Aline Merci,
Mariana Moraes Góes,
Suzana Mali,
Fábio Yamashita,
Gizilene Maria de Carvalho
Publication year - 2022
Publication title -
principia/revista principia
Language(s) - English
Resource type - Journals
eISSN - 2447-9187
pISSN - 1517-0306
DOI - 10.18265/1517-0306a2021id6430
Subject(s) - amylopectin , starch , amylose , crystallinity , chemical engineering , materials science , elongation , dynamic mechanical analysis , biopolymer , polymer chemistry , chemistry , composite material , organic chemistry , polymer , ultimate tensile strength , engineering
In this study, a better knowledge of the influence of crosslinking mechanism on the mechanical properties of starch films is presented. Thus, waxy starch and cassava starch films, cross-linked with trisodium trimetaphosphate (TMPT), were produced and characterized with respect to their morphology, transport, and mechanical properties. Starch crosslinking was verified by RAMAN spectroscopy and by iodine binding capacity (IBC) values, which were determined by color analysis of digital images. Although crosslinking affects the morphology and crystallinity of the films, it was not observed relationship between the mechanism of the crosslinking reaction of starch chain (amylose-amylopectin and amylopectin-amylopectin) and the transport properties. The lower Young Modulus and IBC value and the higher elongation at break observed for crosslinking cassava starch films relative to control and waxy films indicate that crosslinking mechanism influences the mechanical properties of starch films and should be considered to tailor the final properties of packaging and biobased products.