Preparation of flame-retardant cyanate ester with low dielectric constants and dissipation factors modified with novel phosphorus-contained Schiff base

Novel phosphorus-contained Schiff base (PSF) is synthesized by furfurylamine, salicylaldehyde and 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide and is incorporated with CE to prepare a flame-retardant cyanate esters. The thermal property, flame-retardant property and dielectric property are tested. The results show that the incorporating of PSF leads to more incomplete combustion and results in increase in of char yield and flame-retardant property. The LOI value of 35% and UL-94 V-0 rate have been achieved for 1.0% of phosphorus content. The dielectric constants and dissipation factors of CE-PSF increase with the promotion of phosphorus contents and slightly lower than neat CE for forming more s-triazine network with the catalysis of PSF. CE-PSF is an alternate of traditional cyanate ester resin to prepare the matrix material of printed circuit board.