Preparation, non-isothermal crystallization, and melting behavior of β-nucleated isotactic polypropylene/poly (ethylene terephthalate) blends

• Published in: Journal of thermal analysis and calorimetry Vol. 106; no. 3; pp. 895 - 903
• Main Authors: Wang, Chunguang, Zhang, Zishou, Mai, Kancheng
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2011; Springer
• Subjects: Analytical Chemistry; Applied sciences; Chemistry; Chemistry and Materials Science; Crystallization; Exact sciences and technology; Inorganic Chemistry; Measurement Science and Instrumentation; Organic polymers; Physical Chemistry; Physicochemistry of polymers; Polymer Sciences; Properties and characterization; nucleating agent; Polypropylene; Poly (ethylene terephthalate); Supported; Crystallization and melting behavior; Ethylene terephthalate polymer; Melting; Polymer blends; Nucleation; Supported β-nucleating agent; Propylene polymer; Crystallization; Operating conditions; Calcium Carbonates; Isotactic polymer; Preparation; Non isothermal condition; Thermal analysis; Nucleating agent
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-011-1614-6

β -nucleated PP/PET blends were prepared using nano-CaCO 3 supported β -nucleating agent ( β -NA), PP as matrix, and PET as dispersion phase. The effects of preparation methods, PET content, and melting temperature on the non-isothermal crystallization behavior and the melting characteristic and polymorphic composition of PP in the blends were investigated by differential scanning calorimeter (DSC) and wide angle X-ray diffraction (WAXD). The results indicated that the PP crystallized predominantly in β -modification in the presence of β -NA. However, efficiency of β-NA for PP crystallization decreased with addition of PET and increasing PET contents. The β -nucleation of β -NA for PP crystallization in the blends was dependant on the preparation methods. The high β -nucleation and high β -PP content were obtained for PP/PET blend prepared at the temperature of 265 °C and added the β -NA into the blend at the temperature of 180 °C. However, the addition of β -PP or β -NA into blends at 265 °C decreased the β -nucleation, and no β -PP was formed because the β -NA mainly dispersed on the PET dispersion phase or at the interface between PP and PET.