Thermal oxidative degradation of additive-free polypropylene pellets investigated by multichannel Fourier-transform chemiluminescence spectroscopy |
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Authors: | Ayako Yano Nobuyuki Akai Hiroshi Ishii Chikahiro Satoh Takayuki Hironiwa Keith R. Millington Munetaka Nakata |
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Affiliation: | 1. Graduate School of BASE (Bio-Applications and Systems Engineering), Tokyo University of Agriculture and Technology, Naka-cho, Koganei, Tokyo 184-8588, Japan;2. Japan Applied Technology Inc., Yaho, Kunitachi, Tokyo 186-0011, Japan;3. Koga Isotope Ltd., Koka-cho, Koka, Shiga 520-3404, Japan;4. CSIRO, Materials Science and Engineering, Geelong Technology Precinct, Waurn Ponds, VIC 3216, Australia |
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Abstract: | Thermal oxidative degradation of additive-free polypropylene pellets heated isothermally in dry air at 150 and 180 °C (below and above the melting point of 163 °C) was investigated by multichannel Fourier-transform chemiluminescence spectroscopy. The initial peak wavelength of chemiluminescence emission at 490 nm remained constant during the early stages of thermal degradation, but new emissions developed with time in the red spectral region over an extended oxidation period. The time-dependent luminescence spectra were deconvoluted into three emission bands by least-squares fitting using Gaussian curves. We concluded that at least three groups of luminescent species (luminophores), having different conjugation lengths, were generated by thermal oxidation over extended periods and show luminescence around 490, 660, and 740 nm. |
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Keywords: | Polypropylene Thermal oxidative degradation Fourier-transform multichannel spectrometer Chemiluminescence spectral changes Emission mechanism |
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