pH sensitive phosphate crosslinked films of starch‐carboxymethyl cellulose

This work aims to develop hydrogel films of starch and carboxymethyl cellulose (CMC) crosslinked with sodium trimetaphosphate (STMP) and to characterize some of their properties. Starch and STMP (S/T), starch and CMC (S/C), and mixed (S/T/C) films were prepared by casting. The degree of substitution...

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Bibliographic Details
Published in:Polymer engineering and science 2021-02, Vol.61 (2), p.388-396
Main Authors: Cagnin, Caroline, Simões, Bruno Matheus, Yamashita, Fábio, Carvalho, Gizilene Maria, Grossmann, Maria Victória Eiras
Format: Article
Language:English
Subjects:
Carboxymethyl cellulose
Cellulose
Chemical properties
Crosslinked polymers
Crosslinking
hydrogel
Hydrogels
Hydrogen-ion concentration
Mechanical properties
Methylcellulose
Morphology
Observations
Phosphates
Substitutes
Swelling
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Summary:This work aims to develop hydrogel films of starch and carboxymethyl cellulose (CMC) crosslinked with sodium trimetaphosphate (STMP) and to characterize some of their properties. Starch and STMP (S/T), starch and CMC (S/C), and mixed (S/T/C) films were prepared by casting. The degree of substitution, morphology, swelling degree, FTIR, mechanical properties, and sorption isotherms were studied. Reticulated samples (S/T and S/T/C) showed the same degree of substitution (0.050 ± 0.001). All films presented homogeneous morphology, but the mixed film showed greater roughness. Crosslinking increased the swelling capacity of the mixed hydrogel at pH 7, although it remained decreased concerning the S/T hydrogel. However, this property was sensitive to pH variations. The mixed film (S/T/C) showed greater mechanical resistance. The casting process was efficient to produce hydrogel films of starch/CMC crosslinked with STMP and the general results demonstrated the advantages of the mixed hydrogel. Starch (S), and a blend (9:1) of starch with carboxymethyl cellulose (S/C) were crosslinked with sodium trimetaphosphate (T) and used to develop hydrogel films. The same samples without crosslinking were used as controls. While film S quickly disintegrated, the other films maintained their integrity within up to 12 h of swelling. The S/C/T sample presented 45% higher swelling capacity compared with S/T. This property was pH sensitive, increasing at higher pH.
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25582