Amine-quinone polyimides – High temperature polymers that protect iron against corrosion - Polyimides and Other High Temperature Polymers - page 489

Table 1.
Composition of the polyimides

Polyimide Monomers (mole percent) Moisture absorption

(%)

η inh
(dL/g)

AQPI-2 AQMDA (50) BTDA (50) 0.97 0.9
AQPI-3 AQMDA (50) 6FDA (50) 1.18 1.0
AQPI-4 AQODA (50) BTDA (50) 0.99 0.8
AQPI-5 AQODA (50) 6FDA (50) - a - a
AQPI-6 AQMDA (25) MDA (25) BTDA (50) 1.02 0.7
AQPI-7 AQMDA (25) MDA (25) 6FDA (50) 0.96 0.7
AQPI-8 AQODA (25) ODA (25) BTDA (50) 1.00 0.8
AQPI-9 AQODA (25) ODA (25) 6FDA (50) 0.79 1.0
PI MDA (50) BTDA (50) 1.01 1.5
a The poly(amic acid) from AQODA and 6FDA could not be obtained because it always made a
gel.

Table 2.
Thermal properties of polymers

Polymer T 5% (°C) Char yield (%) T g (°C)

AQPI-2 472 69.0 292

AQPI-3 448 62.5 286

AQPI-4 455 67.6 280

AQPI-6 440 64.2 289

AQPI-7 453 59.8 279

AQPI-8 479 62.8 296

AQPI-9 474 57.9 310

PI 525 61.8 282

Table 3.
Tensile properties of the amine-quinone polyimides

Polyimide Elastic modulus (GPa) Tensile strength (MPa) Elongation at break (%)

AQPI-2 1.1 140 24.4

AQPI-3 1.1 146 24.6

AQPI-4 0.9 92 16.4

AQPI-6 1.0 131 21.6

AQPI-7 1.3 133 13.5

AQPI-8 1.5 161 16.5

AQPI-9 1.2 138 18.3

PI 1.5 169 19.3