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Glass transition and enthalpy relaxation process in coal tar pitches

✍ Scribed by P. Ehrburger; Ch. Martin; J.L. Saint-Romain


Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
676 KB
Volume
70
Category
Article
ISSN
0016-2361

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✦ Synopsis


Coal tar pitches generally have very complex chemical compositions and structures. Their physico-chemical properties depend on the mutual molecular interactions of their various components. In order to characterize these materials further the properties related to their glass transition behaviour have been investigated. As for polymeric materials, enthalpy relaxation can provide useful information on the interactions occurring


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Differential scanning calorimetry was used to investigate the glass-to-rubber transition at 383 K of Illinois No. 6 coal dried at 383 K and thermally treated to 523 K. The intensity of the transition is 0.2 J g-' K-I, 'run 2' in Figure 1. The sample was then cooled to 303 K. This procedure was repea