sile strength then increases with further increase of the
cassava starch mass fraction up to 100 g per 100 g of
chitosan. The increasing tensile strength values of the
blended films, with the cassava starch mass fraction in-
creasing from 100 to 150 g per 100 g of chitosan, are at-
tributable to the formation of intermolecular hydrogen
bonds between NH4
+ of the chitosan backbone and OH–
of the cassava starch (13). There was a negative correla-
tion between the tensile strength and gelatin. The effect
of glycerol on elongation is shown in Fig. 2. Glycerol, as
a plasticizer, is added to the film to modify its mechani-
cal properties, making the film more flexible, since the
plasticizer reduces the intermolecular bonds between
the polymer chains. The elongation increased with in-
creasing glycerol and reached a maximum value at a
level of 63 g per 100 g of chitosan. Therefore, 63 g of
glycerol per 100 g of chitosan plasticized the films. Simi-
lar behaviour was observed in other hydrophilic films
composed of polysaccharides and proteins (28,29).
sile strength then increases with further increase of thecassava starch mass fraction up to 100 g per 100 g ofchitosan. The increasing tensile strength values of theblended films, with the cassava starch mass fraction in-creasing from 100 to 150 g per 100 g of chitosan, are at-tributable to the formation of intermolecular hydrogenbonds between NH4+ of the chitosan backbone and OH–of the cassava starch (13). There was a negative correla-tion between the tensile strength and gelatin. The effectof glycerol on elongation is shown in Fig. 2. Glycerol, asa plasticizer, is added to the film to modify its mechani-cal properties, making the film more flexible, since theplasticizer reduces the intermolecular bonds betweenthe polymer chains. The elongation increased with in-creasing glycerol and reached a maximum value at alevel of 63 g per 100 g of chitosan. Therefore, 63 g ofglycerol per 100 g of chitosan plasticized the films. Simi-lar behaviour was observed in other hydrophilic filmscomposed of polysaccharides and proteins (28,29).
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