Thermodynamic characterization of the melting of a series of polyesteramides |
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Authors: | G. Manzini V. Crescenzi A. Ciana L. Ciceri G. Della Fortuna L. Zotteri |
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Affiliation: | Istituto di Chimica, Università di Trieste, Trieste and Laboratori Ricerche SNAM-Progetti, Milan, Italy |
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Abstract: | The changes in enthalpy, entropy and volume upon melting have been determined by dilatometric and differential scanning calorimetry measurements for four polyesteramides of the type: with the following values for n and m; 6-6, 12-2, 12-6 and 12-12. The changes in each state function vary quite regularly with the number of CH2 groups/repeating unit. A comparison is made between experimental data on the entropy of fusion and theoretical predictions. There is emphasis on the influence on the thermodynamics of melting of the rigidity of the -OCO-φ-CONH- residues and, in particular, of the persistence in the molten state of many interchain hydrogen bonds. |
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