ABSTRACT
Abstract-A series of pyridine-containing poly(imide-siloxane) (PIS) co-polymers with different amounts of PDMS with various segmental lengths were synthesized from 2,6-diaminopyridine (DAP), α,ω-aminopropylpoly(dimethylsiloxane) (PDMS), 1,3-bis(4-aminophenoxy)benzene (APB) and 4,4’-oxydiphthalic dianhydride (ODPA). As the DAP and PDMS are not as reactive as APB, a modified synthesis approach was employed instead of the approaches commonly reported in the literature, to ensure the incorporation of DAP and PDMS. The Tg of the co-polymers increased with increasing segmental length of PDMS. As the incorporation of PDMS caused a decrease in polarizability and an increase in free volume, the dielectric constant decreased with the increase in content and segmental length of PDMS. The surface resistivity of the films decreased as the PDMS segment increased, due to the segregation of PDMS to the surface of the films.
