Manipulation of Polymer/Polymer Interface Width from Nonequilibrium Deposition
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- 作者：Wumin Yu ; Someswara R. Peri ; Bulent Akgun ; Mark D. Foster
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2013
- 出版时间：April 24, 2013
- 年：2013
- 卷：5
- 期：8
- 页码：2976-2984
- 全文大小：408K
- 年卷期：v.5,no.8(April 24, 2013)
- ISSN：1944-8252
文摘
We demonstrate, using neutron reflectivity, that the width of a nonequilibrium interface between an organo-soluble aromatic polyimide film and triacetate cellulose (TAC) support film created by spin-coating or solution-casting can be broadened in a controllable way using a 鈥渟welling agent鈥?in the deposition process. In a favorable case, the adhesion, as measured by T-peel tests, can be increased by a factor of 7 by adjustment of the solvent composition. The morphologies of the TAC fractured surfaces after peeling tests measured by AFM reveal that broadening of the interfacial width causes an interconnected network in the interface, leading to a sharp increase in the interfacial adhesion. Differences in the chemistry (solubility) of the materials being deposited do make a difference in the effectiveness of this strategy of using a 鈥渟welling agent鈥? For one polyimide, a 3-fold increase in adhesion can be obtained by optimizing the deposition temperature, but this approach for improving adhesion is less effective than that of adding 鈥渟welling agent鈥? The formation of robust interfaces of this type is important because of the critical roles that multilayer films containing polymers with special properties and tailored structures play in applications as diverse as computer displays, photovoltaic devices, and polymeric electronics. The 鈥渟welling agent鈥?strategy makes it possible to produce polymer multilayer structures in a cost-effective way with roll-to-roll mass production using direct solution coating.