Article | REF: A3360 V2

Polyamides PA

Author: Bernard GUÉRIN

Publication date: May 10, 1994 | Lire en français

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    3. Properties

    3.1 General

    Some twenty producers worldwide market over a thousand different grades made from the twenty or so types of polyamide industrially available, out of some 65 currently known PA types. Every year, around a hundred new grades replace the older ones to meet the needs of industry.

    Hydrogen bonds, electrostatic interactions between a hydrogen atom bonded to a strongly electronegative atom (N) and a polar group containing a strongly electronegative atom (O), are highly energetic because they involve large dipole moments with very small interpolar distances due to the small size of the atoms involved.

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