Fig. 13. TGA of POCP and POHP.

The second stage: includes the loss of the dopant species , SO3 and one OH-radical and H2O of sulfuric acid in the temperature range between 100 oC and 250 oC , the weight loss for this step was found to be(14.68%) which is in good agreement with the calculated value (14.7%)

The third stage: in the temperature range between 250 oC and 400 oC, includes the benzenoid ring and 5 molecules of OH-.The weight loss for this step was found to be (24.8 %) which is in good agreement with the calculated value(24. 6%).

The fourth step: the remaining part of the polymer decomposition,was found to be 56.17 in the range 400-600 oC and the calculated value is equal to 56.1. c.f. Table 6


Table 6. TGA analysis of POCP and POHP
