title: Effect of octa(aminophenyl) polyhedral oligomeric silsesquioxane functionalized graphene oxide on the mechanical and dielectric properties of polyimide composites.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, National Tsing-Hua University , Hsin-Chu 30013, Taiwan.
authors.forename: Wei-Hao
authors.initials: WH
authors.lastname: Liao
authors.forename: Shin-Yi
authors.initials: SY
authors.lastname: Yang
authors.forename: Sheng-Tsung
authors.initials: ST
authors.lastname: Hsiao
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Wang
authors.forename: Shin-Ming
authors.initials: SM
authors.lastname: Li
authors.forename: Chen-Chi M
authors.initials: CC
authors.lastname: Ma
authors.forename: Hsi-Wen
authors.initials: HW
authors.lastname: Tien
authors.forename: Shi-Jun
authors.initials: SJ
authors.lastname: Zeng
keywords: dielectric properties; graphene oxide; mechanical properties; octa(aminophenyl) POSS; polymer-matrix composites (PMCs)