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Differential scanning calorimetry studies on water restrained in hydroxyethylcellulose and hydrophobically modified hydroxyethylcellulose
Author(s) -
Tanaka Ryohei,
Hatakeyama Tatsuko,
Hatakeyama Hyoe
Publication year - 1997
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1997.021980318
Subject(s) - differential scanning calorimetry , aqueous solution , polymer , polymer chemistry , bound water , chemistry , chemical engineering , molecule , organic chemistry , thermodynamics , physics , engineering
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).