Polyketone

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Polyketone
Image:Polyketone.PNG
Density	140 kg/m3
Young's modulus(E)	1500 MPa
Tensile strength(σt)	55 MPa
Elongation @ break	350%
notch test	20 kJ/m2
Glass temperature	15°C
melting point	220°C
Vicat B<span class="reference plainlinksneverexpand" id="ref_<1>"><1>	205
heat transfer coefficient (λ)	0.27 W/m.K
linear expansion coefficient (α)	11 10-5 /K
Specific heat (c)	1.8 kJ/kg.K
Water absorption (ASTM)	0.5
Price	3-5 €/kg
# <cite id="endnote_<vic>" style="font-style: normal;">^  Deformation temperature at 10kN needle load
source: A.K. vam der Vegt & L.E. Govaert, Polymeren,
van keten tot kunstof, ISBN 90-407-2388-5

Polyketones are a family of high-performance thermoplastic polymers. The highly polar ketone groups in the polymer backbone of these materials gives rise to a strong attraction between polymer chains, which increases the material's melting point (255 degrees celsius for Carilon). Such materials also tend to resist solvents and have good mechanical properties. Unlike many other engineering plastics, aliphatic polyketones such as Shell's Carilon (where "R" in the diagram is an ethyl group) are relatively easy to synthesize and can be derived from inexpensive monomers. Carilon is made with a palladium(II) catalyst from ethylene and carbon monoxide. A small fraction of the ethylene is generally replaced with propylene to reduce the melting point somewhat.

For a discussion of the silicon containing polymers originally thought to have analogous structures, see silicone polymers.

External links

• Macrogalleria

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