Chemistry Reference
In-Depth Information
polyesterketone “Ultrapek.” It is widely used in electronics, electrician,
for extrusion of tubes and pipes operating in aggressive media and at low
temperatures. The polyesteresterketones and polyester ketones are used
for multilayer coating as the basis of printed planes. The conservation of
mechanical strength in conditions of high humidity and temperature, the
stability to radiation forwards their application to aerospace engineering.
The compositions on the basis of polyesteresterketones already com-
pete with those based on thermoreactive resins when making parts of mili-
tary and civilian aircrafts. Sometimes it is possible to cut the weight on
30% if produce separate parts of plane engines from reinforced polyester-
esterketones.
It is proposed to use the polyesteresterketones in the manufacture of
fingers of control rod and cams of brake system, motors buttons in car
industry. The piston cap of automobile engine, made from polyesterester-
ketone “Victrex,” went through 1300 h of on-the-road tests.
The advantage of using this material, contrary to steel, lays in wearout
decrease, noise reduction, 40% weight reduction of the article. The impor-
tant area of application of polyesteresterketones can be the production of
bearings and backings. The polyester ester ketones are recommended to be
used for piece making of drilling equipment (zero and supporting mantles)
and timber technique, in different joining's of electric equipment of nu-
clear reactors, layers and valves coverings, components of sports facility.
The fibers of diameter 0.4 mm (from which the fabric is weaved in
shape of tapes and belts used in industrial processes where the temperature-
resistant, the high-speed conveyers are needed) are produced from polyes-
ter ester ketone melt at temperatures of 350-390 °C. The fabric from poly-
esteresterketone or polyesterketone keeps 90% of the tensile strength after
thermal treatment at 260 °C, does not change its properties after steaming
at 126 °C for 72 h under the load, and resists alkalis action with marginal
change. The medical instruments, analytical, dialysis devices, endoscopes,
surgical and dental tools, containers made of polyarylesterketones can be
sterilized by steam and irradiation [330].
The manifold methods of synthesizing polyarylenesterketones have
been devised by Russian and foreign scientists within the last 20 years.
For example, the method for production of aromatic polyketones by
means of Friedel-Craft polycondensation of bis(arylsilanes) with chlorides
of aromatic dicarboxylic acids (isophthaloyl-, terephthaloyl-, 4,4{}-oxy-
dibenzoylchloride) at 20 °C in environment of dissolvent (1,2-dichloreth-
