Chemistry Reference
In-Depth Information
The block-copolyesters based on oligoesterketones and oligoestersul-
fones of various degree of condensation have been produced in Ref. [430]
by means of acceptor-catalyst polycondensation; the products contain
simple and complex ester bonds.
Polyestersulfoneketones possessing lower glassing temperatures and
excellent solubility have been synthesized in Ref. [431] by means of low-
temperature polycondensation of 2,2{}, 6,6{}-tetramethylbisphenoxybi-
sphenylsulfone, iso- and terephthaloylchloride in the presence of AlCl
3
and
N-methylpirrolydone in environment of 1,2-dichlorethane. The increasing con-
centration of iso- and terephthaloylchloride results in greater glassing tempera-
tures of statistical copolymers.
The manufacture of ultrafiltration membranes is possible on the basis of
mix polysulfone-polyesterketone [432, 433]. Transparent membranes ob-
tained by means of cast from solution have good mechanical properties in
both dry and hydrated state and keep analogous mechanical properties after
exposition in water (for 24 h at 80 °C). The maximal conductivity of mem-
branes at 23 °C is 4.2×10
-2
Sm/cm while it increases to 0.11 Sm/cm at 80 °C.
In spite of a number of investigations in the area of synthesis and char-
acterization of polyestersulfoneketones, there are no data in literature on
the polyestersulfoneketones of block-composition based on bisphenylol-
propane (or phenolphthalein), dichlorbisphenylsulfone and dichlorbenzo-
phenone, terephthaloyl-bis(
n
-oxybenzoylchloride).
Russian references totally lack any researches on polyestersulfonek-
etones, not speaking on the production of such polymers in our country.
Accounting for this, we have studied the regularities of the synthesis and
produced block-copolyestersulfoneketones of some valuable properties
[423]. The main structure elements of the polymers are rigid and extreme-
ly thermo-stable phenylene groups and flexible, providing for the thermo-
plastic reprocessibility, ester, sulfone and isopropylidene bridges.
Synthesized, within given investigation, polyestersulfoneketones on
the basis of phthalic acid; polyarylates on the basis of 3,5-dibromine-
n
-
oxybenzoic acid and phthalic acids and copolyesters on the basis of tere-
phthaloyl-bis(
n
-oxybenzoic) acid are of interest as heat-resistant and film
materials which can find application in electronic, radioelectronic, avia,
automobile, chemical industries and electotechnique as thermo-stable
constructional and electroisolation materials as well as for the protection
of the equipment and devices from the influence of aggressive media.
