Chemistry Reference
In-Depth Information
Russian and foreign scientists remarkably succeeded in both areas of
creation of new inflammable, heat- and thermal resistant polycondensa-
tion polymers and areas of development of methods of performing poly-
condensation and studying of the mechanism of reactions grounding the
polycondensation processes [1-6].
The reactions of polycondensation are the bases of producing the most
important classes of heterochain polymers: polyarylates, polysulfones,
polyarylenesterketones, polycarbonates, polyamides and others [7-12].
Non-equilibrium polycondensation can be characterized by a num-
ber of advantages among the polycondensation processes. These are the
absence of exchange destructive processes, high values of constants of
speed of growth of polymeric chain, et cetera. However, some questions
of nonequilibrium polycondensation still remain unanswered: the mecha-
nism and basic laws of formation of copolymers when the possibility of
combination of positive properties of two, three or more initial monomers
can be realized in high-molecular product.
The simple and complex aromatic polyesters, polysulfones and
polyarylene ketones possess the complex of valuable properties such as
high physic-mechanical and dielectric properties as well as increased ther-
mal stability.
There is a lot of foreign scientific papers devoted to the synthesis and
study of copolysulfones based on oligosulfones and polyarylenesterk-
etones based on oligoketones.
Because of importance of the problem of creation of thermo-stable
polymers possessing high flame and thermal resistance accompanied
with the good physic-mechanical properties, the study of the regularities
of formation of copolyesters and block-copolyesters based of oligosul-
foneketones, oligosulfones, oligoketones and oligoformals appeared to be
promising depending on the constitution of initial compounds, establish-
ing of interrelations between composition, structure and properties of co-
polymers.
To improve the basic physic-mechanical parameters and abilities to be
reused (in particular, to be dissolved), the synthesis of copolyesters and
block-copolyesters has been performed through the stage of formation of
oligomers with end reaction-able functional groups.
As the result of performed activities, the oligomers of various chemical
compositions have been synthesized: oligosulfones, oligoketones, oligo-
sulfoneketones, oligoformals, and novel aromatic copolyesters and block-
copolyesters have been produced.
