Phase behavior of concentrated hydroxypropyl methylcellulose solution in the presence of mono and divalent salt

Thermo reversible sol–gel transitions of hydroxypropylmethylcellulose (HPMC) are critical for many pharmaceutical, cosmetic, and food applications. This study examined the effects of salt (NaCl and CaCl2) on the viscoelastic properties of concentrated low molecular weight HPMC solutions and found th...

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Bibliographic Details
Published in:Carbohydrate polymers 2014, Vol.99, p.630-637
Main Authors: Almeida, Nalinda, Rakesh, Leela, Zhao, Jin
Format: Article
Language:English
Subjects:
Applied sciences
Calcium Chloride - chemistry
Calorimetry, Differential Scanning
Cellulose and derivatives
Differential scanning calorimetry
Elasticity
Exact sciences and technology
Gelation
Hydroxypropylmethylcellulose
Hypromellose Derivatives
Methylcellulose - analogs & derivatives
Methylcellulose - chemistry
Molecular Weight
Mono and divalent salt
Natural polymers
Phase behavior
Phase Transition
Physicochemistry of polymers
Rheology
Sodium Chloride - chemistry
Solutions
Temperature
Thermodynamics
Viscoelasticity
Viscosity
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Summary:Thermo reversible sol–gel transitions of hydroxypropylmethylcellulose (HPMC) are critical for many pharmaceutical, cosmetic, and food applications. This study examined the effects of salt (NaCl and CaCl2) on the viscoelastic properties of concentrated low molecular weight HPMC solutions and found that the gelation temperature decreased linearly as a function of salt concentrations, independent of valency of cations and the mole concentration of anions. Thermal analysis showed that the depression of melting temperature can be fitted for both NaCl and CaCl2 as a function of the total number of ions by a single linear curve, which was consistent with the melting point depression of pure water by NaCl and CaCl2, but with a higher linear slope.
ISSN:0144-8617
1879-1344
DOI:10.1016/j.carbpol.2013.08.081