Reaction-driven solvent transport in UV-curable phase-separating coatings

IF 2.3 4区材料科学 Q2 Chemistry

Journal of Coatings Technology and Research Pub Date : 2022-09-07 DOI:10.1007/s11998-022-00661-7

M. Yamamura

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引用次数: 2

Abstract

We experimentally examined the time-evolutions of local compositions in photocurable, monomer-solvent-initiator ternary liquid film coatings using attenuated total-reflectance-Fourier transform infrared spectroscopy. The coatings exhibited phase separation upon UV exposure owing to the inherent partial miscibility between the solvent and the polymer. The solvent concentration at the bottom of the coating increased when exposed to UV light for 1 s from the top, showing a solvent transport along the irradiation direction. The differences in solvent concentration before and after UV exposure showed good agreement with model predictions based on stress-induced non-Fickian solvent mass transport. The solvent concentrations at the bottom remained constant in the case of discrete phase structures, whereas it exponentially decayed over time in bicontinuous phase structures. These results suggest that light-tunable microstructures enable the relaxation of the reaction-driven nonuniformity in solvent concentration distributions.

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紫外光固化相分离涂料中反应驱动的溶剂输运

我们用衰减全反射-傅里叶变换红外光谱法实验研究了光固化、单体-溶剂-引发剂三元液膜涂层中局部成分的时间演变。由于溶剂和聚合物之间固有的部分混溶性，涂层在紫外线照射下表现出相分离。紫外光从上照射1 s后，涂层底部溶剂浓度增加，溶剂沿照射方向输运。紫外曝光前后溶剂浓度的差异与基于应力诱导的非菲克式溶剂质量输运的模型预测一致。在离散相结构的情况下，底部的溶剂浓度保持不变，而在双连续相结构中，溶剂浓度随时间呈指数衰减。这些结果表明，光可调的微观结构可以使溶剂浓度分布的反应驱动的不均匀性松弛。

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来源期刊

Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS

CiteScore

4.40

自引率

8.70%

发文量

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.