Chemistry Reference
In-Depth Information
So, when conducting the reaction at 65-85 °C in water, alcohol, es-
ter, acetonitrile, the polyketone particles of size 0.01-100 micrometers
transform the polyesters by the oxidation under the peroxide agents: per-
oxybenzoic, m-chloroperoxybenzoic, peroxyacetic, triflouruperoxyacetic,
monoperoxyphthalic, monoperoxymaleine acids, combinations of Н
2
О
2
and urea or arsenic acid [405, 406].
For increasing of basic physical-mechanical characteristics and repro-
cessing, in particular of solubility, the synthesis of aromatic polyketones
is lead through the stages of formation of oligomers with end functional
groups accompanied by the production of block-copolyketones or through
the one-stage copolycondensation initial monomers with production of co-
polyketones.
So, unsaturated oligeketons are produced [407, 408] by the condensation
of aromatic esters (e.g., bisphenyl ester, 4,4′-bisphenoxybisphenyl ester and
others) with maleic anhydride in the presence catalyst AlCl
3
.
The oligoketones with end amino groups can be produced [409] on the
basis of dichloranhydride of aromatic dicarboxylic acid, aromatic carbo-
hydrate and telogen (N-acylanylode) according Friedel-Crafts reaction in
organic dissolvent.
The oligoketones can be produced [410] by polycondensation of bi-
sphenyloxide and 4-fluorobenzoylchloride in solution, in the presence of
AlCl
3
. It has been found that the structure of synthesized oligomer is crys-
talline.
The synthesis of oligoketones, containing phthaloyl links, can be im-
plemented [411] by the Friedel-Craft reaction of acylation.
The cyclical oligomers of phenolphthalein of polyarylenestersulfonek-
etone can be produced [412] by cyclical depolymerization of correspond-
ing polymers in dipolaraprotic solvent (dimethylformamide), dimethylac-
etate in the presence of СsF as catalyst.
The aromatic oligoesterketones can be produced by means of interaction
between 4,4′-dichlorbisphenylketone and 1,1-dichlor-2,2-di(3,5-dibrom-
n
-oxy-
phenyl)ethylene in aprotic dipolar dissolvent (dimethylsulfoxide) at 140 °C in
inert gas [ 413]. The copolyesterketones of increased thermo-stability, heat- and
fire-resistance can be synthesized on the basis of obtained oligomers.
The works on production of oligoketones and synthesis of aromatic
polyketones on their basis are held in Kh.M. Berbekov Kabardino-Balkarian
State University.
