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Article | REF: A3360 V1

Polyamides PA

Author: Bernard GUÉRIN

Publication date: May 10, 1994

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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.

Example

By way of example, figure

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