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Thermal Behavior of Water in the Selected Starch- and Cellulose-based Polymeric Hydrogels by Damrongsak Faroongsarng; Patchara Sukonrat is a Pharmacology, Toxicology and Pharmaceutics article available to read on EtoBox.

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In a polymer-water matrix, freezable water is depressed due to either porosity confinement or interaction. The aim of the study was to examine water crystallization/melting depression by sub-ambient differential scanning calorimetry. The selected starch-and cellulose-based polymers including pre-gelatinized starch (PS), sodium alginate, sodium starch glycolate, hydroxypropylmethyl cellulose (HPMC), sodium carboxymethyl cellulose, and croscarmellose sodium were employed. The pre-treated with ambient humidity (85-100% relative humidity, at 30.0 ± 0.2 • C for 10 days) and with excess water (hydrogels) samples were subjected to between 25 and -150 • C cooling-heating cycle at 5.00 • C/min rate. The volume fractions of hydrogels were measured by light scattering technique. It was observed that all polymers but PS and HPMC with ambient humidity presented freezable water in two distinct fractions namely bound water where crystallizing/melting temperature was depressed and bulk water. The water transition in samples with various contents exhibited the pattern as a polymer solution, thus rather than confinement, the depression was due to interaction. The volume fraction-melting temperature

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Author

Damrongsak Faroongsarng; Patchara Sukonrat

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0378-5173)

Published

2008

Language

EN

Field

Pharmacology, Toxicology and Pharmaceutics (Life Sciences)