Heat capacity change on isothermal vitrification during a macromolecule's growth

M. Cassettari, G. Salvetti, E. Tombari, S. Veronesi and G.P. Johari

Physica A: Statistical Mechanics and its Applications, 1993, vol. 201, issue 1, 95-100

Abstract: The heat capacity of a liquid in which monomers chemically react to form a macromolecule has been measured as the reaction progresses under isothermal conditions. It first irreversibly increases and then undergoes a step decrease to a value which is mainly due to vibrational contributions. This is remarkably similar to the decrease in heat capacity observed near the glass transition temperature on supercooling a liquid. The number of covalent bonds in the macromolecule's structure at its vitrification decreases with the decrease in the isothermal reaction temperature. Conclusions on the role of intra- and intermolecular interactions determining the molecular kinetics of liquids have been drawn.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:201:y:1993:i:1:p:95-100

DOI: 10.1016/0378-4371(93)90404-R

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