Visualization of the Formation of Interfacially Polymerized Film by an Optical Contact Angle Measuring Device

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• 作者：Fang Yuan ; Zhi Wang ; Xingwei Yu ; Zhihong Wei ; Shichun Li ; Jixiao Wang ; Shichang Wang
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：May 31, 2012
• 年：2012
• 卷：116
• 期：21
• 页码：11496-11506
• 全文大小：583K
• 年卷期：v.116,no.21(May 31, 2012)
• ISSN：1932-7455

文摘

Interfacial polymerization (IP) is widely used in the synthesis of thin film composite membranes and encapsulation of active ingredients. However, there are few reports on the observation of film formation by IP. In the present work, a visualized technology was developed for studying film formation by interfacial polymerization. An optical contact angle measuring device (OCA) was used to visualize the morphology of pendant drop of aqueous solution immersed in organic solution and the film formed during interfacial polymerization process. First, the variations of the morphology of pendant drop of aqueous solution were studied, the results offered in situ experimental evidence for the growth of interfacial film toward the organic phase. Furthermore, the effects of various synthesis conditions on film morphology were studied. It was found that the bubbles were generally appeared on the films. The bubbles on the films were attributed to the instability arising from the formation of the nascent solid thin film with a huge surface energy per volume. The bubbles on the films could ultimately result in the rough membrane surface. This paper also indicated that OCA is a very useful tool for in situ studying the fundamentals of IP film formation process.