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首页> 外文期刊>Journal of Applied Polymer Science >Plasma Dissociation Reaction Kinetics. 1.Methyl Methacrylate
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Plasma Dissociation Reaction Kinetics. 1.Methyl Methacrylate

机译：等离子体解离反应动力学。 1.甲基丙烯酸甲酯

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Fourier transform infrared spectroscopy (FTIR) was utilized to study the plasma gas-phase reaction kinetics and reaction mechanisms in capacitively coupled glow discharges of methyl methacrylate (MMA) under zero monomer flow rate conditions. The gas-phase study shows two major electron-impact-induced dissociation pathways in MMA plasma: the C-O bond cleavage reaction and decarboxylations. The C-O bond cleavage reaction accounts for approximately one-half of the MMA dissociation, and neutral fromaldehyde and dimethyl ketene (DMK) are produced via intramolecular rearrangement. Decarboxylations produce CO, CO_2, and a number of radicals that subsequently stabilize to form neutrals, including propylene, allene, and methanol. These intermediate species then further dissociate in the plasma to small hydrocarbons (methane, acetylene, and ethylene), CO, CO_2, and H_2. Plasma power and initial monomer pressure have only minor effects on the MMA fragmentation chemistry. However, the reaction rate increases at higher-power and lower initial monomer pressure conditions. The modeling also reveals the relative reactivities of the neutrals. A time-scale transformation technique based on the MMA decompositon half-life significantly reduces the effects of the reactor condition on the kinetics. In addition, mass balance ratios are utilized to calculate the portion of plasma species that have been accounted for by the in situ technique.
机译：利用傅里叶变换红外光谱（FTIR）研究了在零单体流量条件下甲基丙烯酸甲酯（MMA）的电容耦合辉光放电中的等离子体气相反应动力学和反应机理。气相研究表明，MMA等离子体中有两个主要的电子碰撞诱导解离途径：C-O键裂解反应和脱羧反应。 C-O键裂解反应约占MMA解离的一半，并且通过分子内重排产生中性的醛和二甲基乙烯酮（DMK）。脱羧会产生CO，CO_2和许多自由基，这些自由基随后稳定形成中性化合物，包括丙烯，丙二烯和甲醇。然后，这些中间物质在血浆中进一步解离为小烃（甲烷，乙炔和乙烯），CO，CO_2和H_2。等离子体功率和初始单体压力对MMA裂解化学影响很小。然而，在较高功率和较低初始单体压力条件下，反应速率增加。该建模还揭示了中性点的相对反应性。基于MMA分解半衰期的时标转换技术显着降低了反应器条件对动力学的影响。另外，质量平衡比被用于计算已经通过原位技术解决的血浆种类的部分。

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