Study of thermo-oxidative chemical pre-treatment of isotactic polypropylene

• Published in: Journal of thermal analysis and calorimetry 2014-11, Vol.118 (2), p.1331-1338
• Main Authors: Alaburdaitė, Rasa, Krylova, Valentina
• Format: Article
• Language: English
• Subjects: Analytical Chemistry; Calorimetry; Chemistry; Chemistry and Materials Science; Crystallization; Dielectric films; Heating; Inorganic Chemistry; Isotactic; Measurement Science and Instrumentation; Oxidation; Physical Chemistry; Polymer Sciences; Polypropylene; Polypropylenes; Semiconductors; Spectra; Thin films
• ISSN: 1388-6150; 1588-2926; 1572-8943
• DOI: 10.1007/s10973-014-4226-0

A thermo-oxidative pre-treatment with chemical solutions is required in order to provide the adherence of inorganic semiconductor to the isotactic polypropylene (iPP) surface. A few thin films of iPP were treated with oxidizing solution at 90 °C. The crystalline properties were analyzed using XRD, and it had shown the presence of the α-monoclinic phases. The ATR-FTIR spectra had indicated that characteristic iPP peaks after thermo-oxidative chemical pre-treatment diminished sharply. Moreover, the new carbonyl groups (C = O) were observed, which signified oxidation. The UV–Vis spectra had showed a blue shift in the absorption edge, which corresponded to decrease in the optical band gap. The non-isothermal decomposition and crystallization kinetics of iPP films were studied and compared by means of thermogravimetric analysis and differential scanning calorimetric measurement. The values of the melting temperature T m and the crystallization temperature T c were found to be iPP surface structure and heating/cooling rate dependent. The activation energy of crystallization E c was determined.