| Although the inorganic optical materials have the advantages of low optical loss and high optical stability,the high cost of manufacturing technology restricted their further application in optical waveguide,especially in the application of local area network.Polymeric optical materials,with easy and rapid processability,good compatibility with semiconductor materials and facile controllability of optical properties,have addressed the demand for photonic components that meet economic criteria as well as technical requirements in telecom and datacom industries.Although a wide range of optical waveguide devices based on different polymeric materials have been demonstrated,the important material properties, precise controllability of refractive index,low optical loss,low birefringence,and sufficient thermal stability,are still required for successful design and fabrication of photonic devices. In this work,a series of novel(fluorinated) poly(aryl ether)s containing phthalazinone moieties were synthesized,and the relationship of the properties with the composition of the polymers were also investigated.And our efforts focused on investigating the potential of the synthesized polymers in optical waveguide applications.A series of novel poly(phthalazinone ether(ketone) sulfone)(PPEKS and PPESs) have been prepared by the nucelophilic reaction of 4-(4-hydroxyphenyl)-phthlazin-1(2H)-one (DHPZ),4,4'-bis(4-chlorophenyl)sulfone(DCS),and 4,4'-difluorobenzophenone (DFK)/bisphenol S(BPS).The obtained polymers exhibited excellent thermal stabilities (glass transition temperatures Tgs:224～289℃,the temperatures of 1%weight loss Td1%s: 446-494℃) and good solubility in polar organic solvents.The PPEKS thin films exhibited high refractive index(TE mode,1310 nm:1.656,1550 nm:1.653),high thermo-optic coefficient value(dn/dT)(TE mode,1310 nm:-1.21×10-4/℃,1550 nm:-1.22×10-4/℃) and relatively low optical loss(1310 nm:0.24 dB/cm,1550 nm:0.52 dB/cm).By adjusting the feed ratio of the reactants,the polymers' refractive indices of 1310 nm and 1550 nm(TE mode) could be well controlled in the range of 1.622～1.656 and 1.619～1.653,respectively.A kind of novel cross-linkable poly(phthalazinone ether ketone sulfone) bearing tetrafluorostyrene and phthalazinone groups(FSt-PPEKS) has been prepared by copolycondensation reaction.And the films could be cured at 160℃in the presence of 1 wt%dicumyl peroxide as an initiator for 4 hr under vacuum to yield stable cross-linked films. The glass transition temperature(Tg) and the temperature of 1%weight loss(Td1%) were 261℃and 494℃,respectively,which could be further increased by 31℃and 14℃upon thermal cross-linking.And the birefringence of cross-linked polymer thin film was reduced from 0.02 to 0.007 after thermal cross-linking.A series of novel fluorinated poly(aryl ether)s containing phthalazinone moieties(FPPEs) have been prepared by a modified synthetic procedure in order to reduced the optical loss. The obtained polymers exhibited excellent solubility in polar organic solvents and high thermal stabilities(Tgs:185～269℃,Td1%s:487～510℃).The FPPEs exhibited relatively low optical loss(less than 0.24 dB/cm at 1550 nm) and high thermo-optic coefficient value(dn/dT) (TE mode,1310 nm:-0.96×10-4～-1.25×10-4/℃,1550 nm:-0.96×10-4～-1.29×10-4/℃).By adjusting the feed ratio of the reactants,the polymers' refractive indices of 1310 nm and 1550 nm(TE mode) could be well controlled in the range of 1.499～1.575 and 1.498～1.575, respectively.A kind of novel cross-linkable fluorinated poly(phthalazinone ether) bearing tetrafluorostyrene and phthalazinone groups(FSt-FPPE) has been prepared by copolycondensation reaction.The Tg and Td1% were 237℃and 486℃,respectively,which could be further increased by 16℃and 11℃upon thermal cross-linking.And the birefringence of cross-linked polymer thin film was reduced from 0.022 to 0.005 after thermal cross-linking.
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