Conversion of Hydrophilic Surface of Poly(ethylene terephthalate) Film to Hydrophobic One under Hydrophilic Conditions.

Yasuyuki Suzuki, Jun Li, Y. Maekawa, Masaru Yoshida, K. Maeyama, N. Yonezawa
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Abstract

The hydrophilic surface of poly(ethylene terephthalate) (PET) film, obtained by partial hydrolysis, was converted to hydrophobic one under dry air, saturated water vapor atmosphere, nitrogen, and vacuum at temperatures ranging from 0 to 80 °C. The hydrophilicity of the surface increased significantly faster under the saturated water vapor although it was the most hydrophilic in the examined conditions. From the dependence of the absolute temperature on the rate of hydrophilicity change for each storage condition, a discontinuous point at ca. 50 °C was observable only under the water vapor condition. This relation indicates that the appreciable acceleration of the hydrophilicity change on the surface under the hydrophilic condition might be resulted from the increase of the surface mobility due to the water adsorption on the PET surface.
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亲水条件下聚对苯二甲酸乙酯膜亲水表面向疏水表面的转化。
通过部分水解得到的聚对苯二甲酸乙酯(PET)薄膜的亲水性表面在0 ~ 80℃的干燥空气、饱和水蒸气气氛、氮气和真空条件下转化为疏水性表面。在饱和水蒸气条件下,表面的亲水性增加明显更快,尽管在试验条件下它是最亲水的。从绝对温度对各储存条件下亲水性变化率的依赖性来看,仅在水蒸气条件下,在约50°C处观察到不连续点。这一关系表明,在亲水性条件下,表面亲水性变化的明显加速可能是由于PET表面吸附了水而增加了表面迁移率。
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