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首页> 外文期刊>Journal of Applied Polymer Science >Sorption and Diffusion of Water Vapor in Poly(ethylene terephthalate) Film
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Sorption and Diffusion of Water Vapor in Poly(ethylene terephthalate) Film

机译：聚对苯二甲酸乙二酯薄膜中水蒸气的吸附和扩散

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摘要

The sorption and diffusion of water vapor in poly(ethylene terephthalate) (PET) film were measured by applying a thermogravimetric analyzer (TG-DTA), which customarily has been used to detect the weight loss of a sample with the increase of temperature under a given atmosphere. In this case, we detected the weight gain of PET film by sorption of water vapor under a given humidity at a constant temperaure. Sorption-rate curve were successfully obtained in spite of the low solubility of PET film and the presence of Fickian-type curves. The solubility was better described according to the dual-mode sorption model. The diffusion coefficients were determined in their initial slopes by the short-time method. We found that the diffusion coefficient depended on vapor pressure.
机译：聚对苯二甲酸乙二酯（PET）膜中水蒸气的吸附和扩散是通过使用热重分析仪（TG-DTA）来测量的，该分析仪通常用于检测样品的失重随温度的升高而降低。给定气氛。在这种情况下，我们通过在恒定温度下在给定湿度下吸附水蒸气来检测PET膜的重量增加。尽管PET膜的溶解度低且存在Fickian型曲线，但仍成功获得了吸附率曲线。根据双模式吸附模型更好地描述了溶解度。通过短时法确定扩散系数在其初始斜率中。我们发现扩散系数取决于蒸气压。

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