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Type: Artigo
Title: Influence Of Thermal Treatment Time On Structural And Physical Properties Of Polyimide Films At Beginning Of Carbonization
Author: Ferreira
Fabio A. S.; Battirola
Liliane C.; Lewicki
James P.; Worsley
Marcus A.; Pereira-da-Silva
Marcelo A.; Amaral
Thiago; Lepienski
Carlos M.; Rodrigues-Filho
Ubirajara P.
Abstract: Poly(4,4'-oxydiphenylene-oxydiphthalimide) (POO) was thermally treated at 773 K for 1, 15 and 60 min under argon atmosphere resulting in free-standing films with intermingled characteristics between polymer and carbon-rich derivatives. Degradative thermal analysis performed by pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS) revealed CO2 among the major products of thermal decomposition which according to electron paramagnetic resonance (EPR) passed through a radical process. X-ray diffraction (XRD) revealed thermal treated samples with semicrystalline organization that was attributed to the development of lamellae structure. Moreover, Atomic force microscopy (AFM) showed an increase in the roughness of the samples that acquired pronounced roughcast-like surface. Hence, there was an enhancement of mechanical strength and dielectric permittivity. From the data collected a mechanism of thermal decomposition was proposed. (C) 2016 Elsevier Ltd. All rights reserved.
Subject: Polyimide
Carbon-rich Derivatives
Thermal Degradation
Structural Rearrangement
Editor: Elsevier Sci LTD
Rights: fechado
Identifier DOI: 10.1016/j.polymdegradstab.2016.05.001
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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