Chemistry Reference
In-Depth Information
The polymers synthesis is recommended to be carried out in inert gas at-
mosphere at temperatures 50-450 °C. If catalysts used are the salts of car-
bonic or hydrofluoric acids then oligomers appear. Chain length regulators
when producing polyesterketones based on difluoro- or dichlorbenzophe-
none and bisphenolates of alkali metals and dihydroxynaphthalenes can be
the monatomic phenols [251-253].
The synthesis of polyesterketones and polyesteresterketones accord-
ing to the Friedel-Crafts reaction is lead in mild conditions [265-283].
So, solidifying thermo-stable aromatic polesterketonesulfones, applied as
binding agents when laminating, can be produced [278] in the presence of
aluminum chloride by the interaction of 1,4-di(4-benzoylchloride)butadi-
ene-1,3-dichloranhydrides of iso- and terephthalic acids, bisphenyl oxide
and 4,4′-bisphenoxybisphenylsulfone.
The aromatic polyesterketones and their thioanalogs are synthesized
[266-281, 284] with help of polycondensation of substituted and not sub-
stituted aromatic esters and thioesters with choric anhydrides of dicarbox-
ylic acids in environment of aprotone dissolvents at temperatures from
−10 till 100 °C in the presence of Lewis acids and bases.
The aromatic polyesterketones and polyesterketonesulfonamides
based on 4,4′-dichloranhydride of bisphenyloxidebicarbonic acid and
4-phenoxybenzoylchloride can be produced by means of Friedel-Crafts
polycondensation in the presence of AlCl
3
[270]. The reduced viscosity
of the solution in sulfuric acid of concentration 0.5 gram/deciliter is 0.07-
1.98 dL/g. The Friedel-Crafts reaction can also be applied to synthesize
the copolyesterketones from bisphenyl ester and aromatic dicarboxylic
acids or their halogenanhydrides [274]. The molecular mass of polymers,
assessed on the parameter of melt fluidity, peaks when bisphenyl ester is
used in abundant amount (2-8%).
The polyarylesterketones can be produced by means of interaction
between bisphenylsulfide, dibenzofurane and bisphenyloxide with mono-
mers of electrophylic nature (phosgene, terephthaloylchloride) or using
homopolycondensation of 4-phenoxybenzoylchloride and 4-phenoxy-
4-chlorcarbonyl-bisphenyl in the presence of dichloroethane at 25 °C
[282-285]. Aromatic polyesterketones form after the polycondensation of
4-phenoxybenzoylchloride with chloranhydrides of tere- and isophthalic
acids, 4,4′-dicarboxybisphenyloxide in the environment of nitrobenzene,
methylchloride and dichloroethane at temperatures from −70 till 40 °C
during 16-26 h according Friedel-Crafts reaction.
