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首页> 外文期刊>RSC Advances >Degradation of a series of fluorinated acrylates and methacrylates initiated by OH radicals at different temperatures
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Degradation of a series of fluorinated acrylates and methacrylates initiated by OH radicals at different temperatures

机译：在不同温度下由OH基团引发的一系列氟化丙烯酸酯和甲基丙烯酸酯的降解

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Rate coefficients for the gas-phase reactions of OH radicals with a series of fluorinated acrylates and methacrylates: 2,2,2-trifluoroethylmethacrylate ( k _(1) ), 1,1,1,3,3,3-hexafluoroisopropylacrylate ( k _(2) ), 1,1,1,3,3,3-hexafluoroisopropylmethacrylate ( k _(3) ), and 2,2,2-trifluoroethylacrylate ( k _(4) ) have been measured for the first time as a function of temperature in the range 290–308 K. The kinetic data obtained were used to derive the following Arrhenius expressions (in units of cm ~(3) per molecule per s): k _(1) = (2.13 ± 0.68) × 10 ~(?18) ?exp[(4745 ± 206)/ T ], k _(2) = (8.72 ± 0.68) × 10 ~(?15) ?exp[(2166 ± 205)/ T ], k _(3) = (6.30 ± 0.51) × 10 ~(?17) ?exp[(3721 ± 153)/ T ] and k _(4) = (3.93 ± 0.43) × 10 ~(?16) ?exp[(3140 ± 129)/ T ]. The experiments were performed at normal atmospheric pressure in synthetic air using a 1080 L photoreactor and coupled with FTIR analysis to monitor the decay of the substances of interest and the reference compounds. The obtained negative temperature dependencies are in agreement with a mechanism implying an initial addition of the OH radical to the double bond. Atmospheric implications are discussed with reference to the rate coefficients obtained as a function of the temperature.
机译：用一系列氟化丙烯酸酯和甲基丙烯酸酯的OH自由基的气相反应的速率系数：2,2,2-三氟乙基丙烯酸甲酯（K _（1）），1,1,1,3,3,3-六氟异丙基丙烯酸丙烯酸酯（K. _（2）），首次测量1,1,3,3,3,3,3,3,3-六氟异丙基丙烯酸甲丙烯酸甲酯（K（3））和2,2,2-三氟乙基丙烯酸酯（K _（4））在290-308k范围内的温度函数。获得的动力学数据用于衍生出以下的Arrhenius表达（以每分子为每分子为单位的Cm〜（3））：K _（1）=（2.13±0.68） ×10〜（？18）？exp [（4745±206）/ t]，k _（2）=（8.72±0.68）×10〜（？15）？exp [（2166±205）/ t]，k _（3）=（6.30±0.51）×10〜（？17）？exp [（3721±153）/ t]和k _（4）=（3.93±0.43）×10〜（？16）？exp [ （3140±129）/ t]。使用1080L光反应器在合成空气中的正常大气压下进行实验，并与FTIR分析相结合，以监测感兴趣的物质和参考化合物的衰减。所获得的负温度依赖性与暗示对双键自由基的初始添加的机构一致。参考作为温度函数获得的速率系数讨论大气意义。

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