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Determination of the Surface Thermodynamic Characteristics of Phthalate Plasticizers by Inverse Gas Chromatography
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-03-05 , DOI: 10.1021/acs.jced.9b01096 Qiang Wang 1 , Qiang Wang 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-03-05 , DOI: 10.1021/acs.jced.9b01096 Qiang Wang 1 , Qiang Wang 1
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The dispersive component of surface energy (γsd) and Lewis surface acid–base parameters (Ka, Kb) for phthalate plasticizers, including dimethyl phthalate, di-n-butyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, and diisodecyl phthalate, were determined by inverse gas chromatography (IGC) at infinite dilution. The IGC study was performed with an oven temperature varying between 313.15 and 343.15 K. Polar and nonpolar probes were used to quantify the solute–sorbent systems. Experimental data showed that the difference between the γsd values calculated by two methods (Schultz and Dorris and Gray) increases with increasing temperature. The acid–base parameters indicated that the surfaces of five examined phthalate plasticizers can be considered as amphoteric with a dominant basic character, and the Ka and Kb values ranged from 0.35 to 0.36 and 1.20 to 1.25, respectively. It was also found that the γsd value increased and the Lewis surface basicity (Kb/Ka) decreased with an increase of the alkyl chain length grafted onto the plasticizers. It is confirmed that IGC was useful for surface characterization and can be used to provide instructive thermodynamic information over a wide temperature range.
中文翻译：
反相气相色谱法测定邻苯二甲酸酯类增塑剂的表面热力学特性
表面能（γ的分散分量小号d）和路易斯表面酸碱参数（ķ一个，ķ b）为邻苯二甲酸酯类增塑剂，包括邻苯二甲酸二甲酯，二- Ñ丁基酯，邻苯二甲酸二-2-乙基己基邻苯二甲酸酯，二异壬基邻苯二甲酸酯，邻苯二甲酸二异癸酯和邻苯二甲酸二异癸酯通过无限稀释的反相气相色谱法（IGC）测定。IGC研究使用的烤箱温度在313.15至343.15 K之间变化。极性和非极性探针用于定量溶质-吸附剂系统。实验数据表明，γ之间的差小号d两种方法（舒尔茨（Schultz），多里斯（Dorris）和格雷（Gray））计算出的数值随温度升高而增加。酸碱参数表明，所检查的五种邻苯二甲酸酯类增塑剂的表面可被视为具有主要碱性特征的两性表面，其K a和K b值分别为0.35至0.36和1.20至1.25。还发现的是，γ小号d值升高和路易斯碱性表面（ķ b / ķ一个）随接枝到增塑剂上的烷基链长的增加而降低。可以肯定的是，IGC可用于表面表征，并可用于在宽温度范围内提供有益的热力学信息。
更新日期：2020-04-24
中文翻译：
反相气相色谱法测定邻苯二甲酸酯类增塑剂的表面热力学特性
表面能（γ的分散分量小号d）和路易斯表面酸碱参数（ķ一个，ķ b）为邻苯二甲酸酯类增塑剂，包括邻苯二甲酸二甲酯，二- Ñ丁基酯，邻苯二甲酸二-2-乙基己基邻苯二甲酸酯，二异壬基邻苯二甲酸酯，邻苯二甲酸二异癸酯和邻苯二甲酸二异癸酯通过无限稀释的反相气相色谱法（IGC）测定。IGC研究使用的烤箱温度在313.15至343.15 K之间变化。极性和非极性探针用于定量溶质-吸附剂系统。实验数据表明，γ之间的差小号d两种方法（舒尔茨（Schultz），多里斯（Dorris）和格雷（Gray））计算出的数值随温度升高而增加。酸碱参数表明，所检查的五种邻苯二甲酸酯类增塑剂的表面可被视为具有主要碱性特征的两性表面，其K a和K b值分别为0.35至0.36和1.20至1.25。还发现的是，γ小号d值升高和路易斯碱性表面（ķ b / ķ一个）随接枝到增塑剂上的烷基链长的增加而降低。可以肯定的是，IGC可用于表面表征，并可用于在宽温度范围内提供有益的热力学信息。
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