Chemistry Reference
In-Depth Information
esters entered into the reaction with diols at sufficiently high temperature
(190 °C).
The relatively low contribution of adverse reactions compared to the
main one led to regular structure of final polyester. The totally aromatic
polyesters of following chemical constitution were studied in Ref. [132]:
polymer “ФТТ-40” consisting of three monomers (terephthaloyl-bis(
n
-
oxybenzoic) acid, terephthalic acid, phenylhydroquinone and resorcinol)
entering to the polymeric chain in quantities 2:3:5. Terephthalic acid was
replaced with monomer containing phenylene cycle in meta-place in poly-
mer “ФГР-80.”
C
O
O
C
O
C
O
O
C
O
terephthaloyl-bis(
n
-oxybenzoic) acid (
A
),
C
O
C
O
terephthalic acid (
B
),
phenylhydroquinone (
C
),
O
O
O
resorcinol (
D
).
O
The monomers entered to the polymeric chain in ratio
A
:
C
:
D
=5:4:1.
These polymers melted at temperatures 300-310°С and switched to
liquid-crystal state of nematic type. The monomers in “ФТТ-40” were
found to be distributed statistically.
The influence of chemical structure of flexible decouplings in polytere-
phthaloyl-bis(
n
-oxybenzoates) on their mesogenic properties was studied
in Ref. [131]. The studied were the polymers which had asymmetrical cen-
