Abstract
Thermal properties, crystallization behavior and isothermal crystallization kinetics of poly(ethylene terephthalate) (PET) composites filled with nanophase carbon black (CB) have been investigated by differential scanning calorimetry (DSC), thermo-gravimetric analysis (TGA) and wide angle X-ray diffractometer (WAXD). Compared with neat PET, thermal properties of the composites are changed significantly. The crystallization temperature decreases from 393 to 373 K when CB content in the composites increases from 0 to 12.5 wt%, while thermal stability of the CB/PET systems is enhanced as increasing initial decomposing temperature (Td) by 9—11 K. Avrami exponents n are evaluated to be 2.1—2.6 for neat PET and the composites. Carbon black nanoparticles acting as nucleating agent in the composites accelerates the crystallization rate as the decreasing half-time of crystallization (t 1/2), and the crystallinity of the composites is improved largely by addition of CB. The present study reveals several aspects of CB/PET composites crystallization behavior which should be considered when designing future applications of developed CB-filled electrical conductive polymer.
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