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A series of fluorinated copolyimides containing phthalazinone moieties were prepared from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride(6FDA),3,3’4,4’-benzophenone-tetracarboxylic dianhydride(BPDA)and2-(4-aminophenyl)-4-[4-(4-aminophenoxyl)phenyl]-2,3-phthalazin-1-one(DHPZ-2NH_2)for making polymeric opticalwaveguides.The resulting copolymers containing 0-50 mo1% BPDA/DHPZ-2NH_2 show good solubility and are soluble insome organic polar aprotic solvents.The copolyimides also present excellent thermal stability.These polymers possess highglass transition temperature higher than 603 K and high decomposition temperature above 742 K determined by differentialscanning calorimetry and thennogravimetric analysis,respectively,under a nitrogen atmosphere.Their refractive indicescould be controlled by varying the ratio of 6FDA and BPDA in the copolymer from 0.5 to 1.0,and the in-plane refractiveindices(n_(TE))range from 1.6366 to 1.6668 and the out-of-plane refractive indices(n_(TM))from 1.6024 to 1.6280 at 632.8 nm.The polymers birefringence(0.0342-0.0388)is almost independent of the 6FDA content of copolymer,which indicated thatthe phthalazinone-containing copolyimides could be suitable to fabricate optical waveguides possessing a low polarizationdependent loss(PDL).
A series of fluorinated copolyimides containing phthalazinone moieties were prepared from 2,2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride (6FDA), 3,3’4,4’-benzophenone- tetracarboxylic dianhydride (BPDA) aminophenyl) -2,3-phthalazin-1-one (DHPZ-2NH_2) for making a polymeric opticalwaveguides. The resulting copolymers contains 0-50 mo1% BPDA / DHPZ-2NH_2 show good solubility and are soluble insome organic polar aprotic solvents. these copolyimides also present excellent thermal stability. these polymers possess high grade transition temperatures higher than 603 K and high decomposition temperature above 742 K determined by differentials scanning calorimetry and then graphogravimetric analysis, respectively, under a nitrogen atmosphere Their diffraction indices are controlled by varying the ratio of 6FDA and BPDA in the copolymer from 0.5 to 1.0, and the in-plane refractive indices (n TE (TE)) range from 1.6366 to 1.6668 and the out- (TM)) fr om 1.6024 to 1.6280 at 632.8 nm. The polymers birefringence (0.0342-0.0388) is almost independent of the 6FDA content of copolymer, which indicates that the phthalazinone-containing copolyimides could be suitable to fabricate optical waveguides possessing a low polarization dependent loss (PDL).