Polyetherimide Subject

In this paper the influence of the level of thermal residual stresses on the development of transverse cracking in cross-ply carbon-polyetherimide laminated beams subjected to bending has been considered. Different levels of ply-to-ply residual stresses were obtained by producing cross-ply ([90/0]s) laminates having different lay-ups in the 0° layer. Two methods were used to analyse the bend tests. The first considered the stress at the formation of the first transverse crack, the second the energy released at the formation of this crack. 

Following contact with strong acids, bases, or reducing agents it was possible to re-form the metal/polyetherimide bond, provided that delamination of the metal coating did not occur. Subjecting the specimen to temperatures of 110°C in air resulted in a color change from pink to bronze and a recovery of the lost adhesion. 

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