Influence of thermal treatment time on structural and physical properties of polyimide films at beginning of carbonization

Autor(es)

Ferreira, Fabio A. S. ^[1] ; Battirola, Liliane C. ^[2] ; Lewicki, James P. ^[3] ; Worsley, Marcus A. ^[3] ; Pereira-da-Silva, Marcelo A. ^{[4, 5]} ; Amaral, Thiago ^[6] ; Lepienski, Carlos M. ^[7] ; Rodrigues-Filho, Ubirajara P. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Grp Quim Mat Hibridos & Inorgan, Inst Quim Sao Carlos, BR-13563120 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Inst Quim, Campinas, SP - Brazil

^[3] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 - USA

^[4] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[5] UNICEP, Ctr Univ Cent Paulista, BR-13563470 Sao Carlos, SP - Brazil

^[6] Univ Sao Paulo, Inst Fis Sao Carlos, Grp Crescimento Cristais & Mat Ceram, BR-13560970 Sao Carlos, SP - Brazil

^[7] Univ Fed Parana, Dept Fis, BR-80060000 Curitiba, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Polymer Degradation and Stability; v. 129, p. 399-407, JUL 2016.
• Citações Web of Science: 5

Resumo

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. (AU)

• Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
• Beneficiário: Edgar Dutra Zanotto
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs