Effect of structure on the thermal behaviour of bisitaconimide resins - Polyimides and Other High Temperature Polymers - page 177

In the IR spectra of these resins characteristics peaks of sulfone and phosphine
oxide groups were present along with the absorption peaks of the imido group.
Characteristic thermal transitions as determined by DSC are given in Table 8.
The char yield of the cured resin (Table 9) was highest in itaconimide having
phosphine oxide and aromatic groups (IT). Presence of sulfone group at meta or
para position did not affect the char yield.

Table 7.
Itaconimides based on amines containing phosphine oxide or sulfone group

S. No Structures of amines Designation of Molecular

weight
(g/mol)

amine itaconimide

1 T IT 605

2 B IB 434

3 S p IS p 436

4 S m IS m 436

Table 8.
Characteristic thermal transitions of bisitaconimides

Bisitaconimide Temperatures (°C)

T m T 1 T exo T 2

IT - 180 210 282

IB - 252 262 300

IS p 107 190 220 301

IS m 88 177 216 297