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2. Properties
Because of their high crystallinity, due to the unbranched structure of their macromolecular chains, POMs are distinguished by a happy combination of different properties, in particular :
high mechanical properties at low (–40 ˚C) and high (up to 105 ˚C) temperatures;
excellent elastic memory (spring effect);
low coefficient of friction and high abrasion resistance (hence the name self-lubricating polymers);
excellent resistance to solvents and bases for copolymers;
low gas permeability;
good dielectric properties.
The properties of POMs depend in part on their degree of crystallinity and their molar mass (table
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Properties
Implementation
Bibliography
Standardization
The Afnor catalog can be consulted online: http://www.afnor.fr
- Plastics – Thermomechanical Analysis (TMA) – Part 1: General principles - ISO 11359-1 - 10-99
- Plastics – Thermomechanical Analysis (TMA) – Part 2: Determination of linear thermal coefficient and glass transition temperature - ISO 11359-2 - 10-99
- Plastics –...
Polyacetal producers
Both homopolymers and copolymers are relatively difficult to produce, and have been for a long time. DuPont and Celanese were the only two producers. Numerous new plants have sprung up in the Far East.
Only DuPont and Asahi offer homopolymers. All other producers offer copolymers. Total worldwide capacity is around 780 kt (table
Organizations
United states Pharmacopoeia (USP)
French National Institute for Research and Safety (INRS)
Drug Master Files, Food and Drug Administration (FDA)
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