Abstract
Fibres from aromatic polyamides have a much higher Young's modulus than fibres from aliphatic polyamides. In order to contribute to the explanation of this observed difference we looked at one of the ultimate properties, the elastic modulus in the crystalline region in the chain direction ( E cr∥). We carried out measurements on a bundle of filaments of PRD 49 fibre, which we identified by i.r. and X-ray analyses as poly( p-phenylene terephthalamide). With the X-ray technique we determined the lattice extensions under loading and from these data the E cr∥ was calculated. The E cr∥ was found to be 20 × 10 11 dyne/cm 2 which is in good agreement with the calculated E cr∥, but not very different from that of nylon-6,6. The Young's modulus was found to be 11 × 10 11 dyne/cm 2.
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