Bulg. J. Phys. vol.30 no.1-2 (2003), pp. 70-79



Calorimetric Studies on PET/PA6 and PA66/PA6 Drawn Blends with Various Thermal Histories

M. Evstatiev, S. Petrovich, B. Krasteva
Laboratory on Polymers, University of Sofia 1126 Sofia, Bulgaria
Abstract. Binary fibrillar reinforced composites are obtained by melt-blending of poly (ethylene terephthalate) (PET) and polyamide 6 (PA6), as well as polyamide 66 (PA66) and PA6 in the presence of a catalyst, followed by cold drawing of the bristle to about 3.5 times and annealing at 220 or 240oC. The blends are studied by DSC and the results suggest cocrystallization (solid solubility) of PA66 and PA6 and cooperative crystallization in the PET/PA6 blend. Annealing at 240oC, results in phase separation and transreactions leading to the in situ generation of block copolymers which improve the compatibility of the blend components (particularly in the case of PET/PA6). These physical and chemical changes affect the mechanical properties of the fibrillar reinforced blends as demonstrated in a separate study.

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