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the combination of aromatic polyesters with halogen-containing com-
pounds and the use of halogen-involving coupling agents [114, 115].
Very different components (aromatic and aliphatic) can become modi-
fiers. They inhibit the processes of combustion and are able to not only
to attach some new features to polymers but also improve their physical
properties.
7.4 AROMATIC POLYESTERS OF TEREPHTHALOYL-BIS-(
N
-
OXYBENZOIC) ACID
Among known classes of polymers the aromatic polyesters with rigid
groups of terephthaloyl-bis-(
n
-oxybenzoic) acid in main chain of next for-
mula attract considerable attention:
C
O
O
C
O
C
O
O
C
O
The polymers with alternating terephthaloyl-bis(
n
-oxybenzoatomic)
rigid (R) mesogenic groups and flexible (F) decouplings of various chemi-
cal structure within the main chain (RF-copolymers) are able to form liq-
uid-crystal order in the melt. The interest to such polymers is reasoned
by fact that dilution of mesogenic “backbone” of macromolecule by flex-
ible decouplings allows one to change the temperature border of polymer
transfer from the partially crystalline state into the liquid-crystal one and
also to change the interval of existence of liquid-crystal melt. The typical
representatives of such class of polymers are polyesters with methylene
flexible decouplings.
These polymers have been synthesized by high-temperature polycon-
densation of terephthaloyl-bis(
n
-oxybenzoylchloride) with appropriate
diols in high-boiling dissolvent under the pressure of inert gas. Bispheny-
loxide is used as dissolvent.
The features of conformation, orientation order, molecular dynamics
of mentioned class of polymers are studied in Refs. [116-119] on the ba-
sis of polydecamethyleneterephthaloyl-bis(
n
-oxybenzoate), P-10-MTOB,
which range of liquid-crystallinity is from 230 °С till 290 °С.
