The objective of this work was to develop a kind of new poly(phthalazinone ether) with high hydrophobicity

good thermal stabilities and excellent mechanical properties.The introduction of fluorine into poly(phthalazinone ether) is regarded as an effective way.A fluorinated poly(phthalazinone ether) containing tetrafluorophenyl groups was successfully synthesized by aromatic nucleophilic substituting self-polycondensation from AB type phthalazinone monomer 4-(4-hydroxyphenyl)-2-(pentafluorophenyl)phthalazin-1(2 H )-one at 100℃.The structure of the polymer was characterized by FTIR ATR

1H-NMR and 19F-NMR.Number average molecular weight characterized by GPC was 1.53 104 Da.The DSC and TGA measurements of the polymer were performed under a nitrogen atmosphere

and the results showed that the polymer exhibited good thermal stabilities with high Tg of 316℃ and 5% mass loss at 491℃.Moreover

the polymer was soluble in common organic solvents

such as DMAc

DMF

DMSO

NMP

TCE

THF

chloroform

pyridine and sulpholane

and could be readily cast into tough and smooth films from solutions.The films also showed high contact angles of water.Contact angle of the film cast by DMAc is 93.3.Contact angle of the film cast by CHCl3 is 92.5.Contact angle of the film cast by THF is 127.1

which is higher than that of polytetrafluoroethylene (112)

indicating that the polymer has high hydrophobicity.Tension test results of film samples indicated the polymer demonstrated excellent mechanical properties with tensile strength over 60 MPa.The polymer exhibited good insulating properties with electrical surface resistivity of 1.81015 /m2 and volume resistivity of 5.61012 /m3.The synthesized polymer may have a promising prospect in microelectronic devices

such as the substrate for printed boards and insulating materials as interlayer dielectrics and intermetal dielectrics.