Abstract
A class of low dielectric constant polyimide (PI) composites was prepared by means of reduced polarization. Consequently, the nonpolar group of long aliphatic chain bridged diamine was synthesized and utilized to prepare PI with pyromellitic dianhydride and subsequently the porous amine-functionalized mobil composition of matter no. 41 (FMCM-41) was synthesized and reinforced into the PI matrix with a view to reduce the value of dielectric constant of PI. Various analytical techniques such as Fourier transform infrared, proton nuclear magnetic resonance, and carbon nuclear magnetic resonance were used to characterize and confirm the synthesized monomer and polymer. The porous nature of hybrid polymer nanocomposites was ascertained using transmission electron microscopic images, and the aggregations of nanoparticles were confirmed by scanning electron microscopic images. The mechanical (tensile) and dielectric behaviors of a material were ascertained by the measurement of porosity. The optimum concentration of FMCM-41-reinforced PI (7 wt% FMCM-41/PI) has the lowest value of dielectric constant of 2.21 at 1 MHz, and beyond this concentration (10 wt% FMCM-41/PI), the reverse trend was observed in the values of dielectric constant and dielectric loss, due to the agglomeration of silica nanoparticles in the PI matrix.
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