Study On Synthesis Of Novel Benzoxazine Based On Polyamine And Application In PCB

Benzoxazine can be synthesized via the reaction of phenol, formaldehyde, and primary amine. Opening ring polymerization takes place when benzoxazine is treated by heating or catalyst such as Lewis acid, then polybenzoxazine whose structure is similar to phenol resins is formed. Polybenzoxazine has good comprehensive performances, for example, heat resistance, mechanic property, flame resistance, flexibility of molecular design, and so on. Besides, polybenzoxazine has zero-shrinkage and do not release any volatile chemical during curing. So benzoxazine has promising prospect in the area of printed circuit board (PCB) and electric packing material.Three kind of various polyamine benzoxazine ,MDA60-BOZ, PM-BOZ and PN-BOZ are prepared from formaldehyde, phenol, aniline and melamine while PM is synthesized through the reaction between melamine, formaldehyde and phenol, and PN is synthesized by rearrangement reaction of condensation between formaldehyde and aniline at 90-95℃. The structural characterization of products of polyamine benzoxazine and composite resin of MDA60-BOZ/epoxy resins is analyzed by FTIR, ¹H-NMR.. The properties of the cured resins are investigated by means of DSC, TGA and DMA.The FTIR spectrum of MDA60-BOZ exhibits absorption at 938cm^-1, PM-BOZ at 945cm^-1and PN-BOZ at 942cm^-1,which represent absorption of stretching vibration of benzoxazine ring. The shift and splitting pattern of ¹H-NMR spectrum of PM-BOZ is 5.44ppm and 4.65ppm, which represent absorption of O-CH2-N and...