Chemistry Reference
In-Depth Information
in which phenylene rings are connected by the oxygen bridges (simple
ester) and carbonic groups (ketones). The polyarylenesterketones include
polyesterketone, polyesteresterketone and others distinguishing in the se-
quence of elements and ratio E/K (of ester groups to ketone ones). This
ratio influences on the glassing temperature and melting point: the higher
content of ketones increases both temperatures and worsens reprocessibil-
ity [213].
The elementary units of polysteresterketones contain two simple ester
and one ketone groups, while those of polyesterketone - only one ester
and one ketone [214].
Polyesteresterketone is partially crystalline polymer the thermo-stabil-
ity of which depends on glassing temperature (amorphosity) and melting
point (crystallinity) and increases with immobilization of macromolecules.
The strong valence bonds define the high thermo-stability and longevity of
mechanical and electrical properties at elevated temperature.
The polyesterketone labeled “Victrex
R
” was firstly synthesized in
Great Britain by company “Imperial Chemical Industries” in 1977. The
industrial manufacture of polyesteresterketones started in 1980 in Western
Europe and USA and in 1982 in Japan [215].
The polyesteresterketone became the subject of extensive study
from the moment of appearance in industry. The polyesteresterketone
possesses the highest melting point among the other high-temperature
thermoplasts (335 °C) and can be distinguished by its highly durable
and flexible chemical structure. The latter consists of phenylene rings,
consecutively joined by para-links to ester, ester and carboxylic groups.
