Crystallization Behavior of Miscible PA6 and PA6IcoT Blends

Crystallization behavior of melting blends between semi-crystalline aliphatic polyamide (PA6) and amorphous semi-aromatic polyamide (PA6IcoT) was studied. Differential scanning calorimetry (DSC) was used to investigate crystallinity,crystallization temperature and the crystallization kinetics. Polarized light microscopy (POM) with on-line hot stage was utilized to observe crystallization phase behavior,while wide-angle X-ray diffraction (WAXD) was applied to identify the structure of resultant crystals. It has been shown that the increase of PA6IcoT composition will lead to decrease in overall crystallinity but increase in relative PA6 crystallinity at non-isothermal crystallization process,and small amount of PA6IcoT will lead to smaller size of nucleus compared to pure PA6. According to the isothermal crystallization kinetics,the increase in PA6IcoT fraction resulted in the decrease of crystallization rate,the Avrami exponent is increased from 4.5 to 6 when the crystallization temperature is increased.