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Figure 3.14. View of DTG curves of unmodified (1) and modified by HC-1 (2), HC-2 (3) PETP -
fibres.
It was shown earlier that effective stabilizers of thermal and thermooxidative destruction
should have conjugation system with developed chain of conjugation. Hexaazocyclanes being
used possessed different degree of conjugation. Owing to this, all hexaazocyclanes additives
being introduced had different stabilizing effect on polymer. This supposition is proved by
differential thermal analysis of PETP - fibres modified by hexaazocyclanes. HC-3 (see Figure
3.12 curve 4) and HC-4 (see Figure 3.12 curve 5) effect on PETP differs from the effects of
HC-1, HC-2, HC-5, HC-6 and HC-7. Probably it is connected with plane structure of
additives.
Thermooxidative destruction of PETP is accompanied by libration of volatile products, so
there is weight loss in polymer sample being tested. That is why, that temperature, at which
decrease of polymer weight is observed, characterized its thermooxidative stability.
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