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Differential scanning calorimetry studies on water restrained in hydroxyethylcellulose and hydrophobically modified hydroxyethylcellulose

Differential scanning calorimetric (DSC) studies were carried out for hydrophobically modified hydroxyethylcellulose (HMHEC)- and hydroxyethylcellulose (HEC)-water systems to examine the binding of water with polymer molecules and the formation of a structure. The amount of freezing-bound water in HMHEC was found to be much less than that in HEC. The above fact suggests that the water-polymer interaction is hindered by the presence of the hydrophobes. The formation of a structure above the melting point of ice was detected by DSC for both systems HMHEC- and HEC-water. Polarizing light micrographs of these two aqueous polymer systems showed the formation of a liquid crystalline state in the same range of temperature. These phenomena were observed in a wider range of water content for HMHEC (W c <4.0) than for HEC (W c <2.5).