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首页> 外文期刊>Journal of Applied Polymer Science >REAL-TIME MONITORING OF DIFFUSION IN POLYMER FILMS USING FLUORESCENT TRACER
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REAL-TIME MONITORING OF DIFFUSION IN POLYMER FILMS USING FLUORESCENT TRACER

机译：使用荧光示踪剂实时监测聚合物薄膜中的扩散

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A method for real-time nondestructive monitoring of small molecules diffusion in polymeric films was developed. The method was based on detection of a fluorescent tracer eluting from the investigated polymer film into the solution in which this film was immersed. The kinetics of the tracer elution, monitored by the increase in solution fluorescence intensity, was used to deduce tracer diffusivity in polymer film. The data were treated using a straightforward mathematical model, describing diffusion from an infinite plane of a certain thickness immersed into a finite solvent bath. Fluorescent 7-diethylamino-4-methyl coumarin was used as a tracer. The diffusion of this tracer within plasticized poly(methyl methacrylate) and styrene-isoprene-styrene block copolymer matrices was monitored. The diffusion coefficients equal to 2 X 10(-9) cm(2)/s and 1 X 10(-9) cm(2)/s, respectively, were obtained. (C) 1995 John Wiley and Sons, Inc. [References: 16]
机译：开发了一种实时无损监测聚合物薄膜中小分子扩散的方法。该方法基于检测荧光示踪剂，该荧光示踪剂从研究的聚合物薄膜洗脱到该薄膜浸入的溶液中。通过溶液荧光强度的增加来监测示踪剂洗脱的动力学，以推断示踪剂在聚合物膜中的扩散率。使用简单的数学模型处理数据，描述了从一定厚度的无限平面浸入到有限溶剂浴中的扩散。荧光7-二乙基氨基-4-甲基香豆素用作示踪剂。监测该示踪剂在增塑的聚（甲基丙烯酸甲酯）和苯乙烯-异戊二烯-苯乙烯嵌段共聚物基质中的扩散。获得的扩散系数分别等于2 X 10（-9）cm（2）/ s和1 X 10（-9）cm（2）/ s。 （C）1995 John Wiley and Sons，Inc. [参考：16]

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