Thermal, mechanical, and dielectric properties of novel fluorinated copoly(imide siloxane)s

Eight new poly(imidesiloxane)s copolymers have been prepared by one-pot solution imidization method. The polymers are made by the reaction of bisphenol-A dianhydride (BPADA) with four different fluorinated diamines and amino-propyl terminated polydimethylsiloxane (APPS). The polymers are named as 1a, 1b, Ic, and Id, respectively, with a siloxane loading of 40 wt %. The second series of polymers where siloxane loading is 20 wt % were named as 1e, 1f, 1g, and 1h. The resulting polymers have been well-characterized by GPC, IR, and NMR techniques. The proton NMR indicates the siloxane loading is about 36-38% for the first series of polymers 1a-1d and a loading of 17-18% for the series of polymers 1e-1h. The films of these polymers showed low water absorption of 0.02% for the first series of polymers and 0.11% for the second series of polymers. Thermal, mechanical, and dielectric properties of these polymers have been evaluated and compared with their nonsiloxane analogues. Preliminary investigations of melt processability of these polymers were also investigated. (c) 2008 Wiley Periodicals, Inc.