Abstract
The nonisothermal crystallization of poly(butylene terephthalate) (PBT) nucleated with elastomer-modified nano-SiO2 [SiO2-(E-MA-GMA)], a commercial nucleating agent (P250), and talc were investigated by differential scanning calorimetry (DSC) under different cooling rates. It was observed that P250, talc, and SiO2-(E-MA-GMA) act as heterogeneous nuclei in PBT; PBT-P250 and PBT-NE [PBT/SiO2-(E-MA-GMA)] blends, in particular, take a shorter time to crystallize. The Avrami, Ozawa, and Mo models were used to analyze the nonisothermal crystallization kinetics. The Avrami-Jeziorny model failed to describe the nonisothermal crystallization of PBT samples. The Ozawa analysis showed that P250, talc, and SiO2-(E-MA-GMA) change the nucleation mechanism and crystal growth of PBT. The crystallization activation energies of all the PBT samples were determined by the Kissinger model. The results show that the crystallization activation energy of PBT-P250 was lower than that of the others, and the nucleating efficiency of SiO2-(E-MA-GMA) on PBT was close to that of P250, while better than that of talc.
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