Dielectric measurements were utilized to follow the advancement of cure in an epoxy/amine formulation. In contrast to earlier studies, complex impedance was measured during cure and used to calculate ionic resistivity. By using complex impedance we were able to separate according to their frequency dependence the contributions to overall polarization from electrode blocking layers, migrating charges, and dipole relaxations. At any stage of cure, there is a unique frequency at which ionic resistivity can be singularly measured. Our approach does not involve trial-and-error frequency search and is conducive to the development of phenomenological models based on equivalent circuits. Excellent agreement was reported between the calculated values of normalized degree of cure obtained by dielectric and calorimetric measurements.

Impedance spectroscopy of reactive polymers. 1 / Bellucci, Francesco; M., Valentino; Monetta, Tullio; L., Nicodemo; J., Kenny; L., Nicolais; J., Mijovic. - In: JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY. - ISSN 1099-0518. - STAMPA. - 32:(1994), pp. 2519-2527.

Impedance spectroscopy of reactive polymers. 1

BELLUCCI, FRANCESCO;MONETTA, tullio;
1994

Abstract

Dielectric measurements were utilized to follow the advancement of cure in an epoxy/amine formulation. In contrast to earlier studies, complex impedance was measured during cure and used to calculate ionic resistivity. By using complex impedance we were able to separate according to their frequency dependence the contributions to overall polarization from electrode blocking layers, migrating charges, and dipole relaxations. At any stage of cure, there is a unique frequency at which ionic resistivity can be singularly measured. Our approach does not involve trial-and-error frequency search and is conducive to the development of phenomenological models based on equivalent circuits. Excellent agreement was reported between the calculated values of normalized degree of cure obtained by dielectric and calorimetric measurements.
1994
Impedance spectroscopy of reactive polymers. 1 / Bellucci, Francesco; M., Valentino; Monetta, Tullio; L., Nicodemo; J., Kenny; L., Nicolais; J., Mijovic. - In: JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY. - ISSN 1099-0518. - STAMPA. - 32:(1994), pp. 2519-2527.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/526100
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