Preparation of flame-retardant cyanate ester with low dielectric constants and dissipation factors modified with novel phosphorus-contained Schiff base
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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.
KeywordsCyanate esters Phosphaphenanthrene Schiff base Cone calorimeter Dielectric constants and dissipation factors
This work was supported by the National Natural Science Foundation of China (Grant Nos. 51373129, 51672201 and JCKY2016110C008).