Ultra-low dielectric constant materials with hydrophobic property: Synthesis of poly(aryl ether sulfone) with POSS and biphenyl group in the main chain

摘要

A series of novel poly(aryl ether sulfone)s (PESs) with polyhedral oligomeric silsesquioxane (POSS) and biphenyl group in the main chain were synthesized from 4,4 '-biphenol, biphenol POSS and 4,4 '-bis[(4-chlorophenyl)sulfonyl]-1,1 '-biphenyl via a nucleophilic aromatic substitution polycondensation. The structures of the polymers were characterized by infrared, nuclear magnetic resonance, and wide-angle X-ray diffraction spectroscopy. The incorporation of POSS and biphenyl group into PES matrix at various molar percentages of POSS resulted in a dramatic decrease of dielectric constant as well as a significant increase of hydrophobicity. As the content of POSS increased, the dielectric constant decreased from 2.54 to 1.82, while the contact angle can be increased to 122.6 degrees. The thermal properties, crystallinity, solvent resistance, and surface topography were also studied in this article.