The Specific Heat of Polyethyleneterephthalate (PET) and the Fusion of its Absorbed Water
- 1 October 1969
- journal article
- research article
- Published by SAGE Publications in Textile Research Journal
- Vol. 39 (10) , 906-911
- https://doi.org/10.1177/004051756903901002
Abstract
Measurements of specific heat at temperatures within the range –70°C to 120°C were obtained for the PET-water system at four different water concentrations. Water-fusion peaks for sorbed water were found in the range –15°C to 0°C. The amount of sorbed water at saturation at 0°C was 1.26 g/100 g PET, and the amount of sorbed water freezable on cooling to –70°C was 0.64 g/100 g. Integral and incremental heats of fusion of sorbed water were determined. The incremental heat, i.e., the heat necessary to melt 1 g of sorbed, freezable water, did not vary with water concentration and had the value 79 cal/g, not significantly different from bulk water. The state of the sorbed water is discussed. The specific heat data for PET is compared with previous results.Keywords
This publication has 6 references indexed in Scilit:
- Heats of fusion of various amounts of absorbed water in wool keratinBiopolymers, 1969
- Specific heat studies of various wool–water systemsBiopolymers, 1968
- Phase Transformations of Water in Porous GlassThe Journal of Physical Chemistry, 1964
- Specific heat of synthetic high polymers. VII. Polyethylene terephthalateJournal of Polymer Science, 1956
- Water Sorption by Synthetic High PolymersJournal of the American Chemical Society, 1950
- The freezing of gelatin gelProceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1926