Effect of pre-stretch on the scratch resistance of isotactic polypropylene
Résumé
Pre-stretching of thermoplastics induces a reinforcement of the mechanical properties towards the draw axis. This will also modify the scratch resistance of the material. Indeed, the material becomes more scratchresistant when the scratch takes place along the pre-stretching direction. In these conditions, the lateral track pad appears before the frontal push pad whereas the opposite behavior is observed for a scratch at 90° of the pre-stretch direction. The oriented iPP surface is less damaged than the isotropic one for same normal load and velocity. It should be noted that for an orientation of 45°, only a half of the groove shows damages.
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