A model for the degradation of polyimides due to oxidation

Details A model for the degradation of polyimides due to oxidation A model for the degradation of polyimides due to oxidation

2010-11-24

arxiv.org/abs/1011.5451v1

Physics

Condensed Matter

Materials Science

13 pages, 2 figures, submitted to Mechanics of Time-dependent Materials

Scientific paper

Polyimides, due to their superior mechanical behavior at high temperatures, are used in a variety of applications that include aerospace, automobile and electronic packaging industries, as matrices for composites, as adhesives etc. In this paper, we extend our previous model in [S. Karra, K. R. Rajagopal, Modeling the non-linear viscoelastic response of high temperature polyimides, Mechanics of Materials, In press, doi:10.1016/j.mechmat.2010.09.006], to include oxidative degradation of these high temperature polyimides. Appropriate forms for the Helmholtz potential and the rate of dissipation are chosen to describe the degradation. The results for a specific boundary value problem, using our model compares well with the experimental creep data for PMR-15 resin that is aged in air.

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