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首页> 外文期刊>Journal of Applied Polymer Science >Swelling and dissolution behavior of poly(methyl methacrylate) films in methyl ethyl ketone/methyl alcohol mixtures studied by optical techniques
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Swelling and dissolution behavior of poly(methyl methacrylate) films in methyl ethyl ketone/methyl alcohol mixtures studied by optical techniques

机译：光学技术研究聚甲基丙烯酸甲酯薄膜在甲乙酮/甲醇混合物中的溶胀和溶解行为

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摘要

Swelling and dissolution behavior of poly(methyl methacrylate) (PMMA) films during unidimensional penetration of methyl ethyl ketone/methyl alcohol (MEK/MA) liquid mixtures at 22 C is presented. Optical microscopy and two-beam interferometry were applied to clamped PMMA films to obtain information on penetration kinetics and penetrant concentration profiles. Dissolution by pure MEK was initially controlled by Case II penetration kinetics and at later stages of the process, by stress cracking in the absence of a surface layer. Introduction of increasing amounts of MA in the liquid solvent resulted in moderation of the fragmentation process, enhanced penetration rates at the early stages of the process, deviations from Case II kinetics at the later stages, and the existence of a surface layer. These results indicate that penetration of MEK/MA mixtures and dissolution of PMMA are characterized by lower diffusion Deborah, and higher dissolution, numbers compared to those of pure MEK. Swelling by pure MA, as well as by nonsolvent MEK/MA mixtures, was characterized by Case II penetration kinetics. A pronounced minimum in the penetration rate versus liquid mixture composition plot was observed at 30 : 70 v/v MEK/MA composition. Laser interferometry was applied to very thin PMMA films, supported on a silicon substrate, to study selected cases. The results obtained were very similar to those obtained by optical microscopy. (C) 2002 John Wiley Sons, Inc. [References: 31]
机译：提出了在22°C的甲乙酮/甲醇（MEK / MA）液体混合物一维渗透过程中，聚甲基丙烯酸甲酯（PMMA）膜的溶胀和溶解行为。将光学显微镜和两光束干涉仪应用于夹紧的PMMA膜，以获得有关渗透动力学和渗透剂浓度分布的信息。最初由Case II渗透动力学控制纯MEK的溶解，在此过程的后期，通过不存在表面层的应力开裂来控制溶解。在液体溶剂中引入越来越多的MA会导致裂解过程的缓和，过程早期阶段渗透率的提高，在后期阶段与Case II动力学的偏离以及表面层的存在。这些结果表明，与纯MEK相比，MEK / MA混合物的渗透性和PMMA的溶解性具有较低的扩散Deborah和较高的溶解性。通过Case II渗透动力学来表征纯MA以及非溶剂MEK / MA混合物的溶胀。在30:70 v / v MEK / MA组成下，观察到了渗透速率与液体混合物组成的关系曲线的最小值。将激光干涉仪应用于支撑在硅基板上的非常薄的PMMA膜，以研究选定的情况。获得的结果与通过光学显微镜获得的结果非常相似。 （C）2002 John Wiley Sons，Inc. [参考：31]

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