Voltar
Artigo Acesso aberto Produção Nacional Revisado por pares
BIBTEX RIS

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

2016; Elsevier BV; Volume: 129; Linguagem: Inglês

10.1016/j.polymdegradstab.2016.05.001

ISSN

1873-2321

Autores

Fábio A. S. Ferreira, Liliane Cristina Battirola, James P. Lewicki, Marcus A. Worsley, Marcelo A. Pereira‐da‐Silva, Thiago Martins Amaral, C.M. Lepienski, Ubirajara Pereira Rodrigues Filho,

Tópico(s)

Epoxy Resin Curing Processes

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.

Referência(s)