Surface plasma treatment effects on the molecular structure at polyimide/air and buried polyimide/epoxy interfaces

作     者：John N.Myers Zhan Chen 

作者机构：Department of ChemistryUniversity of Michigan 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2015年第26卷第4期

页      面：449-454页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the Semiconductor Research Corporation (SRC contract No.2012-KJ-2282) 

主　　题：Molecular structureVibrational spectroscopySum frequency generation spectroscopy 

摘      要：Polyimides are widely used as chip passivation layers and organic substrates in microelectronic packaging. Plasma treatment has been used to enhance the interfacial properties of polyimides, but its molecular mechanism is not clear. In this research, the effects of polyimide surface plasma treatment on the molecular structures at corresponding polyimide/air and buried polyimideJepoxy interfaces were investigated in situ using sum frequency generation （SFG） vibrational spectroscopy. SFG results show that the polyimide backbone molecular structure was different at polyimide/air and polyimideJepoxy interfaces before and after plasma treatment. The different molecular structures at each interface indicate that structural reordering of the polyimide backbone occurred as a result of plasma treatment and contact with the epoxy adhesive. Furthermore, quantitative orientation analysis indicated that plasma treatment of polyimide surfaces altered the twist angle of the polyimide backbone at corresponding buried polyimide/epoxy interfaces. These SFG results indicate that plasma treatment of polymer surfaces can alter the molecular structure at corresponding polymer/air and buried polymer interfaces.