Scientific Results

Specific heat relaxation during macromolecule growth

Year: 1996

Authors: Ferrari C., Salvetti G., Tombari E., Johari G.P.

Autors Affiliation: Istituto di Fisica Atomica e Molecolare del Consiglio Nazionale delle Ricerche, Via del Giardino 7, Pisa, 56100, Italy; Department of Materials Science and Engineering, McMaster University, Hamilton, ON, L8S-4L7, Canada

Abstract: When dissimilar molecules in a liquid mixture react isothermally to form covalent bonds and linear chain macromolecules grow until the liquid vitrifies, the complex C-p of the mixture measured for a fixed frequency decreases. The real component of this C-p measured as a function of the number of covalent bonds formed, or macroscopic reaction time, shows a dispersionlike decrease and the imaginary component a peak. From these data, the evolution of structural relaxation time during the growth of the macromolecules has been determined and its formalism given.

Journal/Review: PHYSICAL REVIEW E

Volume: 54 (2)      Pages from: R1058  to: R1061

KeyWords: DIELECTRIC-SPECTROSCOPY
DOI: 10.1103/PhysRevE.54.R1058

Citations: 45
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