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Novel determination of the dimerization mechanism for thermal polymerization of α-methylstyrene |
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| Authors: | C C Liao Y S Duh C M Shu J H Tzeng |
| Institution: | (1) Process Safety and Disaster Prevention Laboratory, Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology, Sec. 3, Touliu, Yunlin, Taiwan, 64002, 123, University Rd.;(2) Jen-Teh Junior College of Medicine, Nursing, and Management, Houlong, Miaoli, Taiwan, 356, 1, Jin-Ten Rd. |
| Abstract: | This study discussed the phenomena on thermal polymerization of α-methylstyrene (AMS). A curve scanned by temperature-programmed technique was performed by differential scanning calorimetry (DSC). Heat of polymerization (ΔH) and onset temperature of exothermic (T0) behavior were determined to be 280±10 J g-1 and about 138±1°C, respectively. A dimer formation mechanism was proposed for initiation of the propagating chain. Spectroscopic identification of dimer structure was conducted by infrared (IR) spectroscopy in the wavenumber from 650 to 1100 cm-1associated with molecular fingerprint characteristics. The mechanism of thermal polymerization on α-methylstyrene proposed in this study was similar to that of styrene suggested by Mayo. |
| Keywords: | dimer formation mechanism DSC IR -methylstyrene (AMS) thermal polymerization |
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