STABILIZATION AND MODIFICATION OF POLYETHYLENETEREPHTHALATE - Photochemical Reactions in Heterochain Polymers - page 135

Figure 3.13. View of DTA curves for PETP - fibres modified by HC-5 (6), HC-6 (7) and HC-7 (8).
Nilomn [300] has supposed that the length of form I folds causes the degree of
perfection of crystalline form II being formed by the way of partial unfolding of form I folds,
though their nature has not been cleared yet.
Analysis of microphotographs of obtained PETP - fibres samples has shown that there
are both morphological forms of crystals in obtained polymer.Prevalence of one of
morphological forms will probably define the value of melting temperature [300].
On DTA curves of initial PETP - fibre and modified by hexaazocyclanes (Figure 3.11,
curves 2,3; Figure 3.12, 3.13), melting peak is the region having one maximum that proves
made earlier supposition about dependence of melting temperature on morphological