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首页> 外文期刊>Journal of Applied Polymer Science >PERMEATION OF XYLENE ISOMERS THROUGH NITRILE GLOVES
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PERMEATION OF XYLENE ISOMERS THROUGH NITRILE GLOVES

机译：二甲苯异构体通过丁腈手套的渗透

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The physical parameters of the xylene isomers (the positional isomers o-, m-, and p-xylenes and the skeletal isomer ethyl benzene) responsible for the differing permeation behavior of the isomers through lined unsupported 0.41 mm thick nitrile glove material were investigated. An ASTM type permeation cell at 30 degrees C, constant mixing conditions, hexane liquid collection, and capillary column gas chromatography/ mass spectrometry of samples taken from the collection side every ten minutes allowed break through times t(b) and steady-state sections to be defined. While pure isomers had distinct break through times t(b) (m-xylene = p-xylene < ethyl benzene = o-xylene), steady-state permeation rates P-s (p-xylene > m-xylene > ethyl benzene = o-xylene), lag times t(l) (m-xylene < p-xylene = ethylbenzene < o-xylene), and diffusion coefficients D-p (m-xylene < p-xylene = ethyl benzene < o-xylene), such behavior was lost in a equal volume mixture (t(b), t(l), P-s, and D-p were equivalent). The average P-s of the mixture isomers of equal volumes did not differ from that expected from the individual pure isomer P-s values. The results for the pure isomers were attributed to o-xylene and ethyl benzene being similarly sterically hindered, the p-xylene being the flattest and most symmetrical molecule and having no dipole moment, and m-xylene being intermediate in steric structure. The pure isomer t(l) were directly related to viscosity divided by the log octanol-water coefficient, while their log P-s was inversely related to dipole moment times the logarithm of the capacity factor for water for a reversed-phase high-performance liquid chromatography column. In an equivolume mixture of the isomers, isomer interactions caused equivalence for all permeation kinetic parameters, indicating that the kinetics of mixture constituents is not predictable from the behavior of the pure constituents, although mass transfer appears additive. (C) 1997 John Wiley & Sons, Inc. [References: 22]
机译：研究了二甲苯异构体（位置异构体邻，间和对二甲苯以及骨架异构体乙基苯）的物理参数，这些参数通过无衬衬的0.41 mm厚丁腈手套材料渗透了不同的异构体。每10分钟从30摄氏度的ASTM型渗透池，恒定混合条件，己烷液体收集和毛细管柱气相色谱/质谱法（每10分钟从收集侧获取一次）允许突破时间t（b）和稳态段被定义。尽管纯异构体具有明显的突破时间t（b）（间二甲苯=对二甲苯<乙苯=邻二甲苯），但稳态渗透率Ps（对二甲苯>间二甲苯>乙苯=邻二甲苯） ），滞后时间t（l）（间二甲苯<对二甲苯=乙苯<邻二甲苯）和扩散系数Dp（间二甲苯<对二甲苯=乙苯<邻二甲苯），这种行为在等体积的混合物（t（b），t（l），Ps和Dp相等）。等体积混合异构体的平均P-s与单个纯异构体P-s值的预期值没有差异。纯异构体的结果归因于邻二甲苯和乙苯在空间上受到类似的阻碍，对二甲苯是最平坦，最对称的分子，没有偶极矩，间二甲苯在空间结构中处于中间状态。纯异构体t（l）与粘度直接除以辛醇-水系数的对数，而它们的log Ps与偶极矩乘以反相高效液相色谱法水容量因子的对数成反比柱。在异构体的等体积混合物中，异构体相互作用导致所有渗透动力学参数均等，这表明尽管传质似乎是加成的，但从纯组分的行为无法预测混合物组分的动力学。 （C）1997 John Wiley＆Sons，Inc. [参考：22]

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