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Type: Artigo de Periódico
Title: Influence Of Thermal Treatment Time On Structural And Physical Properties Of Polyimide Films At Beginning Of Carbonization
Author: Ferreira
FAS; Battirola
LC; Lewicki
JP; Worsley
MA; Pereira-da-Silva
MA; Amaral
T; Lepienski
CM; Rodrigues
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
Citation: Polymer Degradation And Stability. ELSEVIER SCI LTD, n. 129, p. 399 - 407.
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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