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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Oxygen Diffusion in Glassy Polymer Films: Effects of Other Gases and Changes in Pressure
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Oxygen Diffusion in Glassy Polymer Films: Effects of Other Gases and Changes in Pressure

机译：玻璃态聚合物薄膜中的氧气扩散：其他气体的影响和压力的变化

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摘要

Sensitized single oxygen phosphorescence has been used to quantify oxygen diffusion in polystyrene and poly(methyl methacrylate) films. Prompted by unexplained results from previous studied (Macromolecules 1994, 27, 7041-7048; Can. J. Chem. 1995, 73, 1831-1840), the present experiments have been performed to better characterize the behavior of this photophysical probe of oxygen diffusion under a variety of conditions. Specifically, at total pressures less than 500 Torr, the effects of pressure changes and added nitrogen gas on to measured oxygen diffusion coefficient, singlet oxygen phosphorescence intensity, and rate constant for sensitizer quenching by oxygen have been examined. The results indicate that there is a "low" pressure domain in which the oxygen diffusion coefficient depends both on the oxygen pressure and on the pressure of an added copenetrant. Data obtained are discussed within the context of the dual-mode sorption theory.
机译：敏化的单氧磷光已用于量化氧在聚苯乙烯和聚（甲基丙烯酸甲酯）薄膜中的扩散。由先前研究的无法解释的结果提示（Macromolecules 1994，27，7041-7048; Can。J. Chem。1995，73，1831-1840），已经进行了本实验以更好地表征这种光物理探针的氧扩散行为在各种条件下。具体而言，在总压力小于500 Torr的情况下，已经检查了压力变化和添加氮气对测得的氧扩散系数，单线态氧磷光强度和通过氧气淬灭敏化剂的速率常数的影响。结果表明存在一个“低”压力域，其中氧扩散系数既取决于氧气压力又取决于所添加的助剂的压力。在双模式吸附理论的背景下讨论了获得的数据。

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