Chemistry Reference
In-Depth Information
of the degree of sulfonation. Polyestersulfoneketones gain solubility in
dichloroethane, chloroform, dimethylformamide. The combination of el-
ementary links of polysulfone with elementary links of polyesterketone
also improves the fluidity of composition during extrusion.
The Refs. [424-433] report on various methods of production of poly-
estersulfoneketones.
The 4,4{}-bis(phenoxy)bisphenylsulfone has been synthesized by
means of reaction of phenol with bis-(4-chlorphenyl)sulfone and the low-
temperature polycondensation of the product has been carried out in the
melt with tere- and isophthaloylchloride resulting in the formation of
polyarylenestersulfonesterketoneketones. The polycondensation is con-
ducted in 1,2-dichlorethane at presence of AlCl
3
and N-methylpirrolydone.
Compared to polyesterketoneketones synthesized polymers have greater
temperatures of glassing and decomposition and lower melting point and
also possess higher thermal resistance [424].
The block-copolymers have been created by means of polycondensa-
tion of low-molecular polyesterketone containing the remnants of chlora-
nhydride of carbonic acid and 4,4{}-bisphenoxybisphenylsulfone (I) as
end groups. The increase in concentration of component I result in greater
glassing temperature and lower melting point of block-copolymers.
The block-copolymers containing 32.63-40.7% of component I have
glassing temperature and melting point, respectively 185-193 °С and 322-
346 °С, durability and modulus in tension, respectively 86.6-84.2 MPa
and 3.1-3.4 GPa and tensile elongation 18.5-20.3%.
Block-copolymers have good thermal properties and could be easily
reprocessed in melt [425].
Polyestersulfoneketones have been produced be means of electrophyl-
ic Friedel-Crafts acylation in the presence of dimethylformamides and an-
hydrous AlCl
3
in environment of 1,2-dichlorethane on the basis of simple
2- and 3-methylbisphenyl esters and 4,4{}-bis(4-chloroformylpheoxy)
bisphenylsulfone. The copolymer has the molecular weight of 57,000-
71,000, its temperatures of glassing and decomposition are 160.5-167,0 С
and > 450 °С, respectively, the coke end is 52-57% (N
2
). Copolyestersul-
foneketones are well soluble in chloroform and polar dissolvents (dimeth-
ylformamide and others) and form transparent and elastic films [426].
Some researches of Chinese researchers are devoted to the synthesis
and study of properties of copolymers of arylenestersulfones and esterk-
etones [427-429].
