Study on epoxy resin modified by boron-containing triallyl compounds
A boron-containing triallyl compound(TABM)was designed and prepared by Schiff base synthesis reaction using boron-containing triamine(TAB)and vanillin derived alkene compounds(AM)as raw materials.A series of modified resins(E-51+TABM)were obtained by changing the addition amount of TABM.The structure,thermal stability,thermomechanical properties,tensile shear properties,flame retardancy and microscopic fracture morphology of the cured resin were characterized.The research results showed that,(1)The test results of infrared spectroscopy and nuclear magnetic hydrogen spectroscopy both indicated that the target product TABM was successfully prepared.(2)The research on thermal stability and thermomechanical properties showed that with the increase of TABM dosage,the storage modulus and residual carbon rate of cured epoxy resin also increased,but its glass transition temperature and crosslinking density decreased.This indicated that the addition of TABM could reduce the rigidity of the material and improve the toughness of epoxy resin.(3)After adding TABM,the tensile shear strength of epoxy resin was improved at both room temperature and 100℃.When 10 parts of TABM were added,the tensile shear strength increased by 25.5％at 25℃ and 37.5％at 100℃.(4)As the content of TABM in the resin increased,the limit oxygen index(LOI)value of the cured resin also increased,reaching its maximum value when the addition amount reached 20 parts,indicating that the addition of TABM effectively improved the flame retardancy of the cured resin.(5)The microscopic fracture morphology analysis showed that the fracture toughness of the blended resin(E-51+TABM)was improved.
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