单脉冲激波管中全氟乙烯在有氢条件下的分解

Single Pulse Shock Tube Studies on the Decomposition of C₂F₄ in the Presence of H₂

摘要: 在单脉冲激波管中研究了有H₂条件下C₂F₄的分解。对于分解反应C₂F₄＋Ar→2CF₂＋Ar，利用CF₂插入H₂的后续结果，产生稳定的CH₄作为上述反应的进行度的标识，结果显示温度在1000～1080K分解速率与Modica和LaGraf的速率常数相合。直接测定反应后C₂F₄的剩余浓度，则显示有多于直接热解10倍的C₂F₄消耗。这是由于CF₂与H₂的反应的后果将导致有H原子释入系统内，它引发了C₂F₄的链式聚合。

Abstract: The decomposition of C₂F₄ in the presence of H₂ has been studied in asingle pulse shock tube.As the extend of the reaction C₂F₄+Ar→2CF₂+Ar is assigned to the measured concentration of the final stable product CH₄ led by the consequence of CF₂ insertion into H₂,the decomposition rate at temperature range 1000 to 1080K is consistent with the rate constant given by Modica and LaGraff.The direct measurements of the residuary concentration of C₂F₄ show that in addition to the direct pyrolysis there are 10 times more consumption of C₂F₄ caused by a polymerization chain initiated by the released H atom in the system as a consequence of the reaction of CF₂ with H₂.