**1. Introduction**

192 Thermoplastic Elastomers

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This chapter shows the advantages of low interfacial adhesion thermoplastic matrix, such as polypropylene (PP), and how it can result in improvements to an aramid fabric for ballistics. In addition to the excellent properties for which it is already well known, the purpose here is to highlight a different aspect, i.e. the advantage of poor adhesion on a fabric arrangement for high velocity impacts, where the basis is related to energy dissipation by matrix debonding, thereby generating load redistribution between primary and secondary yarns in the composite. Another advantage is the weatherproofing aspect conferred to the fabric by the matrix, which protects it from harsh environments. Resistance to frontal impact with high speed projectiles was compared in two arrangements; woven aramid/PP on a consolidated configuration and woven aramid/PP on an independent configuration. The methodology for this comparison consisted in establishing impact energies tested on both configurations; before, during and after penetration, identifying the perforation threshold, V50, and measuring back deformation as well as residual energy when the sample was perforated.
