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首页> 外文期刊>Journal of Applied Polymer Science >Water-uptake kinetics in poly(methyl methacrylate) films with a fluorescent rotor probe
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Water-uptake kinetics in poly(methyl methacrylate) films with a fluorescent rotor probe

机译：荧光转子探针在聚甲基丙烯酸甲酯薄膜中的吸水动力学

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摘要

A fluorescence method was adapted to measure moisture-uptake kinetics in films of poly(methyl methacrylate), and data were interpreted in the context of a Fickian diffusion model. The films, 2-60 mum thick, were supported on acid-etched microscope slides. They were compared with several freestanding slabs about I mm thick. The moisture diffusion in the slabs was Fickian with a diffusivity of 3.2 X 10(-9) cm(2)/s. The apparent Fickian diffusivity in the films decreased substantially with decreasing film thickness; however, a careful examination revealed that the initial moisture uptake was governed by a thickness-independent diffusivity for a wide range of film thicknesses. This suggested that the appearance of non-Fickian behavior originated within about a micrometer of the buried interface, possibly as a result of water accumulation beneath the film or slight thickness variations. Moisture uptake in the thickest films was more rapid than in the slabs, most likely because of residual thermal stresses. (C) 2002 Wiley Periodicals, Inc. [References: 46]
机译：荧光方法适用于测量聚甲基丙烯酸甲酯薄膜中的水分吸收动力学，并在Fickian扩散模型的背景下解释数据。将2-60微米厚的薄膜支撑在酸蚀显微镜载玻片上。将它们与几块约1毫米厚的独立式平板进行了比较。平板中的水分扩散为Fickian，扩散率为3.2 X 10（-9）cm（2）/ s。随着膜厚度的减小，膜中的表观Fickian扩散率显着降低。然而，仔细检查发现，在广泛的膜厚度范围内，初始吸湿量受厚度无关的扩散率的控制。这表明非菲克行为的出现是在埋入界面的约一微米之内产生的，这可能是由于膜下积水或厚度略有变化所致。最厚的薄膜中的水分吸收比平板中的要快，这很可能是由于残留的热应力所致。 （C）2002 Wiley Periodicals，Inc. [参考：46]

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