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首页> 外文期刊>Journal of Applied Polymer Science >Evaluation of surface energy of solid polymers using different models
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Evaluation of surface energy of solid polymers using different models

机译：使用不同模型评估固体聚合物的表面能

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In the present work, contact angles formed by drops of diethylene glycol, ethylene glycol, formamide, diiodomethane, water, and mercury on a film of polypropylene (PP), on plates of polystyrene (PS), and on plates of a liquid crystalline polymer (LCP) were measured at 20 degrees C. Then the surface energies of those polymers were evaluated using the following three different methods: harmonic mean equation and geometric mean equation, using the values of the different pairs of contact angles obtained here; and Neumann's equation, using the different values of contact angles obtained here. It was shown that the values of surface energy generated by these three methods depend on the choice of liquids used for contact angle measurements, except when a pair of any liquid with diiodomethane was used. Most likely, this is due to the difference of polarity between diiodomethane and the other liquids at the temperature of 20 degrees C. The critical surface tensions of those polymers were also evaluated at room temperature according to the methods of Zisman and Saito using the values of contact angles obtained here. The values of critical surface tension for each polymer obtained according to the method of Zisman and Saito corroborated the results of surface energy found using the geometric mean and Neumann's equations. The values of surface energy of polystyrene obtained at 20 degrees C were also used to evaluate the surface tension of the same material at higher temperatures and compared to the experimental values obtained with a pendant drop apparatus. The calculated values of surface tension corroborated the experimental ones only if the pair of liquids used to evaluate the surface energy of the polymers at room temperature contained diiodomethane. (C) 2000 John Wiley & Sons, Inc. [References: 24]
机译：在本工作中，由二甘醇，乙二醇，甲酰胺，二碘甲烷，水和汞的液滴在聚丙烯（PP）膜，聚苯乙烯（PS）板和液晶聚合物板上形成的接触角（LCP）在20℃下测量。然后使用以下三种不同的方法评估那些聚合物的表面能：谐波均值方程和几何均值方程，使用此处获得的不同接触角对的值;和诺伊曼方程，使用此处获得的不同接触角值。结果表明，这三种方法产生的表面能的值取决于用于接触角测量的液体的选择，除非使用一对含二碘甲烷的液体。这很可能是由于在20摄氏度的温度下二碘甲烷与其他液体之间的极性不同所致。这些聚合物的临界表面张力也在室温下根据Zisman和Saito的方法使用此处获得的接触角。根据Zisman和Saito方法获得的每种聚合物的临界表面张力值证实了使用几何平均值和Neumann方程得出的表面能结果。在20摄氏度下获得的聚苯乙烯的表面能值也用于评估相同材料在较高温度下的表面张力，并与悬挂式滴落仪获得的实验值进行比较。仅当用于评估室温下聚合物表面能的那对液体中含有二碘甲烷时，表面张力的计算值才能证实实验值。 （C）2000 John Wiley＆Sons，Inc. [参考：24]

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