Effect of Octa(aminophenyl) Polyhedral Oligomeric Silsesquioxane Functionalized Graphene Oxide on the Mechanical and Dielectric Properties of Polyimide Composites

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• 作者：Wei-Hao Liao ; Shin-Yi Yang ; Sheng-Tsung Hsiao ; Yu-Sheng Wang ; Shin-Ming Li ; Chen-Chi M. Ma ; Hsi-Wen Tien ; Shi-Jun Zeng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：September 24, 2014
• 年：2014
• 卷：6
• 期：18
• 页码：15802-15812
• 全文大小：710K
• ISSN：1944-8252

文摘

An effective method is proposed to prepare octa(aminophenyl) silsesquioxane (OAPS) functionalized graphene oxide (GO) reinforced polyimide (PI) composites with a low dielectric constant and ultrastrong mechanical properties. The amine-functionalized surface of OAPS-GO is a versatile starting platform for in situ polymerization, which promotes the uniform dispersion of OAPS-GO in the PI matrix. Compared with GO/PI composites, the strong interfacial interaction between OAPS-GO and the PI matrix through covalent bonds facilitates a load transfer from the PI matrix to the OAPS-GO. The OAPS-GO/PI composite film with 3.0 wt % OAPS-GO exhibited an 11.2-fold increase in tensile strength, and a 10.4-fold enhancement in tensile modulus compared with neat PI. The dielectric constant (D_k) decreased with the increasing content of 2D porous OAPS-GO, and a D_k value of 1.9 was achieved.

Keywords:

graphene oxide; octa(aminophenyl) POSS; polymer-matrix composites (PMCs); mechanical properties; dielectric properties