Chemistry Reference
In-Depth Information
[397, 398]; the kinetics, thermal and liquid-crystal properties of block-
copolymers have been studied.
The polyarylenesterketones have been obtained [399], which contain
blocks of polyarylesterketones, block of triphenylphosphite oxide and
those of binding agent into the cycloaliphatic structures. The film materi-
als on their basis are used as polymer binder in thermal control coatings.
The Refs. [400-402] informed on production of polyester-α-diketones
using different initial compounds.
Non-asymmetrical polyester-α-diketones are synthesized [400] on the
basis of 4-louru-4′(
n
-luorophenylglyoxalyl)benzophenone. Obtained
polymers are amorphous materials with glassing temperature 162-235 °C
and have the temperatures of 10% mass loss in range of 462-523 °C.
The polyester-α-diketones synthesized in Ref. [401] on the basis of
2,2-bis[4-(4-fluorophenylglyoxalyl)phenyl]hexafluoropropane are soluble
polymers. They exhibit the solubility in dimethylformamide, dimethyl-
acetamide, N-methylpirrolydone, tetrahydrofurane and chloroform. The
values of glassing temperature lie in interval 182-216 °C, and tempera-
tures of 10% mass loss are within 485-536 °C and 534-556 °C in air and
argon, respectively.
The number of new polyester-α-diketones in the form of homopoly-
mers and copolymers has been produced [402]. Polyester-α-diketones
have the amorphous structure, include α-diketone, α-hydroxyketone and
ester groups, they are soluble in organic solvents. The films with lengthen-
ing of 5-87%, solidity and module under tension, respectively 54-83 MPa
and 1.6-3 GPa are produced by casting from chloroform solution.
The quinoxalline polymers, possessing higher glassing and soften-
ing temperatures and better mechanical properties compared to initial
polymers, have been produced by means of interaction of polyester-α-
diketones with α-phenylenediamine at 23 °C in m-cresol. Polyquinoxa-
lines are amorphous polymers, soluble in chlorinated, amide and phenol
dissolvents with η
lim
= 0.4-0.6 dL/g (25 °C, in N-methylpirrolydone of
0.5 gram/deciliter).
It is reported [403] on liquid-crystal polyenamineketone and on mix of
liquid-crystal thermotropic copolyester with polyketone [404]. The mix is
prepared by melts mixing. It has been found that the blending agents are
partially compatible; the mixes reveal two glass transition temperatures.
The transitions of polyketones into complex polyesters are possible.
