Chemistry Reference
In-Depth Information
Obtained copoly and block-copolyestersulfoneketones, as well as
polyarylates based of dichloranhydrides of phthalic acids and chloranhy-
dride of 3,5-dibromine-
n
-oxybenzoic acid and copolyester with groups of
terephthaloyl-bis(
n
-oxybenzoic) acid possess high mechanical and dielec-
tric properties, thermal and fire resistance and also the chemical stabil-
ity. The regularities of acceptor-catalyst method of polycondensation and
high-temperature polycondensation when synthesizing named polymers
have been studied and the relations between the composition, structure and
properties of polymers obtained have been established. The synthesized
here block-copolyesters and copolyesters can find application in various
fields of modern industry (automobile, radioelectronic, electrotechnique,
avia, electronic, chemical and others) as thermal resistant construction and
layered (film) materials.
7.2
AROMATIC POLYESTERS
Aromatic polyesters are polycondensation organic compounds containing
complex ester groups, simple ester links and aromatic fragments within
their macromolecule in different combination.
Aromatic polyesters (AP) are thermo-stable polymers; they are ther-
moplastic products useful for reprocessing into the articles and materials
by means of formation methods from solutions and melts.
Mainly, plastics and films are produced from aromatic copolyesters.
APs can be used also as lacquers, fibrous binding agents for synthetic pa-
per, membranes, hollow fibers, as additions for semiproducts when obtain-
ing materials based on other polymers.
Many articles based on APs appear in industry. The world production
of APs increased from 38 millions of tons in 2004 to 50 in 2008, or on
32%. The polymers referred to the class of constructional plastics are dis-
tinguished among APs.
Until now, the technical progress in many fields of industry, especially
in engineering industry, instrument production, was circumfused namely
by the use of constructional plastics. Such exploitation properties of poly-
mers as durability, thermal stability, electroisolation, antifriction proper-
ties, optical transparency and others determine their usage instead of fer-
rous and nonferrous metals, alloys, wood, ceramics and glass [13]. 1 ton
of polymers replace 5-6 tons of ferrous and nonferrous metals and 3-3.5
