Synthesis,characterization and optical properties of cross-linkable poly(phthalazinone ether ketone sulfone)

摘要

Cross-linkable poly(phthalazinone ether ketone sulfone)bearing tetrafluorostyrene groups(PPEKS-FSt)has been prepared by copolycon-densation reaction for optical waveguide applications.The resulting amorphous polymer exhibits good solubility in some common polar organic solvents(e.g.,N,N'-dimethylacetamide,N-methyl-2-pyrrolidinone,chloroform)at room temperature,and can be easily spin-coated into thin films with good optical quality.The glass transition temperature(T_g)and the temperature of 1% weight loss(1% T_d)are 261°C and 494°C,respectively,which could be further increased by 31°C and 14°C upon thermal cross-linking.The cross-linked polymer thin films exhibit high refractive index(~1.65,TE mode),high thermo-optic coefficient value(dn/dT)(-1.455X10~(-4)/°C,TE mode),low optical loss(less than 0.24 dB/cm at 1310 nm)and relatively low birefringence(~0.007).