Polyimide/polystyrene nanocomposite films as membranes for gas separation and precursors for polyimide nanofoams - Polyimides and Other High Temperature Polymers - page 473

(a)

(b)

Figure 5. Thermogravimetric curves of PAA (a) and PAA/PSVP nanocomposite film (b). The solid line
represents the thermogravimetric loss, and the dashed line is the differential analysis of the solid line.

be seen that the imidization of the pure PAA began at 150 ° C and ended at 250 ° C,

while the imidization of the PAA in the composite sample began at 110 ° C and

ended at 210 ° C and the decomposition of the nanospheres began at 320 ° C and

ended at 390 C. In our experiment, thermal imidization at elevated temperature

was adapted to prevent the agglomeration of nanospheres in the polymer matrix.
All of the nanocomposite films were cured by heating at 100°C for 60 min, 150°C
for 60 min, 200

°

C in nitrogen and holding at this temperature for 4 h.

°