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首页> 外文期刊>Journal of Applied Polymer Science >Thermal decomposition of polystyrene in supercritical methanol
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Thermal decomposition of polystyrene in supercritical methanol

机译：聚苯乙烯在超临界甲醇中的热分解

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The degradation of polystyrene (PS) in supercritical methanol was carried out under reaction temperatures ranging from 340 to 420 degrees C and pressures of 10-30 MPa. The selectivity of liquid products was investigated at various reaction conditions. As the reaction proceeded, the selectivity of styrene monomer, dimer, 1,3-diphenyl propane, and 1,3-diphenyl butane had a declining tendency, whereas that of the rest (i.e., toluene, ethyl benzene, isopropyl benzene, and 3-phenyl propanol, etc.) had an inclining tendency. The sequences of decomposition reaction could be reasoned by analyzing the variation of selectivity of liquid products. The kinetic behavior of PS in supercritical methanol had been investigated. The degradation processes of PS in such supercritical fluids could be formulated by the first-order kinetic law at the initial stage of reaction. The activation energy for the degradation in supercritical methanol was evaluated to be 117.2 kJ/mol and it was also compared with the activation energies for depolymerization in other supercritical fluids and that for thermal pyrolysis. (c) 2008 Wiley Periodicals, Inc.
机译：聚苯乙烯（PS）在超临界甲醇中的降解是在340至420摄氏度的反应温度和10至30兆帕的压力下进行的。在各种反应条件下研究了液体产物的选择性。随着反应的进行，苯乙烯单体，二聚体，1,3-二苯基丙烷和1,3-二苯基丁烷的选择性下降，而其余（甲苯，乙苯，异丙苯和3 -苯基丙醇等）具有增加的趋势。可以通过分析液体产物的选择性变化来推断分解反应的顺序。研究了PS在超临界甲醇中的动力学行为。在此类超临界流体中，PS的降解过程可以通过反应初期的一级动力学定律来确定。在超临界甲醇中降解的活化能经评估为117.2 kJ / mol，并且还与在其他超临界流体中解聚的活化能和用于热解的活化能进行了比较。 （c）2008 Wiley期刊公司

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