Study of thermodynamic properties of cellulose at low temperatures

The specific heat C p of cellulose specimens dried at 80, 100 and 150°C, included specimens and ramie, raw cotton and hydrolysed “crystalline” cellulose was measured at temperatures ranging between 80 and 300°K in an adiabatic vacuum calorimeter. Considerable differences were detected in C p and ent...

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Bibliographic Details
Published in:Polymer science USSR 1974, Vol.16 (8), p.2192-2198
Main Authors: Karachevtsev, V.G, Kozlov, N.A
Format: Article
Language:English
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Summary:The specific heat C p of cellulose specimens dried at 80, 100 and 150°C, included specimens and ramie, raw cotton and hydrolysed “crystalline” cellulose was measured at temperatures ranging between 80 and 300°K in an adiabatic vacuum calorimeter. Considerable differences were detected in C p and entropy values of specimens. From an analysis of the mobility of lateral atomic groups of a cellulose macromolecule it was concluded that thermodynamic properties of cellulose may also vary in densely packed chain arrangements. For cellulose specimens with very different reflex intensities on the X-ray photographs no correlation was observed over the entire range of temperature between C p and entropy values on the one hand and reflex tensity, on the other.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(74)90294-9