Chemistry Reference
In-Depth Information
The aromatic polysulfones with the degree of crystallinity of 36% can be
synthesized [179] with help of reaction of 2,2-bis(4-hydroxy-4-tret-butylphe-
nyl) propane with 4,4′-dichlorbisphenylsulfone in the presence of potassium
carbonate in the environment of polar solvent 1,3-dimethyl-2-imidasolidi-
none in current nitrogen at temperatures 130-200 °C. After separation and
purification polymer has η
limit
= 0.5 dL/g.
The possibility to use the synthesized aromatic polysulfone as antipy-
renes of textile materials was shown in Ref. [180].
The production of polysulfones was shown to be possible in Ref. [181]
by means of interaction of sulfuric acid, sulfur trioxide or their mixes with
aromatic compounds (naphthalene, methylnaphthalene, methoxynaphtha-
lene, dibenzyl ester, bisphenylcarbonate, bisphenyl, stilbene) if one used
the anhydride of carbonic acid at 30-200 °C as the process activator. Ob-
tained polymers could be reprocesses by means of pressing,
The synthesis of polyarylenesulfones containing links of 1,3,5-triphe-
nylbenzene can be performed [182] by oxidation of polyarylene thioesters.
Obtained polyarylenesulfones have
T
Tglass
= 265-329 °C and temperature
of 5% loss of weight of 478-535 °C. They are well soluble in organic sol-
vents and possess fluorescent properties.
To produce the polysulfone with alyphatic main chain, the interaction of
SO
2
-group of vinyl-aromatic compound (e.g., of sterol) with nonsaturated
compound (for instance of acrylonitrile) or cyclic olefin (such as 1,5-cy-
clooctadiene) has been provided [183] in the presence of initiator of the
radical polymerization in bulk or melt, the reaction being carried out at
temperatures from 80 to 150 °C.
The method of acceptor-catalyst polyetherification can be used to
produce [184, 185] thermo-reactive polyarylenesulfones on the basis of
nonsaturated 4,4′-dioxy-3,3′-diallylbisphenyl-2,2′-propane and various
chlor- and sulfo-containing monomers and oligomers. The set of physic-
mechanical properties of polymers obtained allows one to propose them
as constructional polymers, sealing coatings, film materials capable of op-
erating under the influence of aggressive environments and high tempera-
tures.
Relatively few papers are devoted to the synthesis and study of poly-
condensational block-copolyesters. At the same time this area represents,
undoubtedly, scientific and practical interest. The number of researches
[186-190] deals with the problem of synthesis and study of physic-chem-
ical properties of polysulfones of block constitution.
