Chemistry Reference
In-Depth Information
catalyzed by alkali, results, with exclusion of bisphenol A and introduction
segments of simple ester, in formation of segmented block-copolymer [189].
The Refs. [190-199] are devoted to the problem of synthesis of sta-
tistical copolymers of polysulfones, production of mixes on the basis of
polysulfones and study of their properties as well to the mechanism of
copolymerization.
The graft copolymer products, poly(met)acrylates branched to polyester-
sulfones, can be produced next way [200]. Firstly, the polyestersulfone is be-
ing chlormethylenized by monochlordimethyl ester. The product is used as
macrostarter for the graft radical polymerization of methylmethacrylate (I),
methylacrylate (II) and butylacrylate (III) in dimethylformamide according to
the mechanism of transferring of atoms under the influence of the catalytical
system FeCl
2
/isophthalic acid. The branched copolymer with I has only
one glassing temperature while copolymer with II and III has three.
Lately, several researches on the synthesis of liquid-crystal polysul-
fones and on the production of mixes and melts of polysulfones with liq-
uid-crystal polymers have appeared [201-205].
For example, the polysulfone “Udel” can be modified [201] by means
of introduction of chlormethyl groups. Then the reaction of transquar-
ternization of chlormethylized polysulfone and obtained nitromethylene
dimesogens is conducted. The dimesogens contain one phenol OH-group
and form nematic mesophase in liquid state. Obtained such a way liquid-
crystal polysulfones, having lateral rigid dimesogenic links, possess the
structure of enantiotropic nematic mesophase fragments.
The Ref. [202] reports on the synthesis of liquid-crystal polysulfone
with mesogenic link - cholesterylpentoatesulfone.
The effect of compatibility, morphology, rheology, mechanical proper-
ties of mixes of polysulfones and liquid-crystal polymers are studied in
Refs. [203-205]. There are several contributions on the methods of syn-
thesizing of copolymers of polysulfones and polyesterketones and on the
production of mixes [206-210]. The method for the synthesis of aromatic
copolyestersulfoneketones proposed in Ref. [206] allows one to decrease
the number of components used, to lower the demands to the concentration
of moist in them and to increase the safety of the process. The method is
in the interaction without aseotropoformer in environment of dimethylsul-
fone of bisphenols, dihaloydarylenesulfones and (or) dihaloydarylenek-
etones and alkali agents in the shape of crystallohydrated of alkali metal
