Performance analysis of the synergistic flame-retardant polyester composite of benzoxazine and sodium lignosulfonate
To improve the flame-retardant properties of polyethylene terephthalate(PET),a composite with PET as the substrate was prepared by using benzoxazine(BOZ)and sodium lignosulfonate(SLS)as modifying materials.The surface morphology of the polyester composite was observed by scanning electron microscopy.The thermal and flame-retardant properties of the polyester composite were investigated by thermogravimetric analysis,differential scanning calorimetry analysis,limiting oxygen index(LOI)test and vertical combustion test(UL-94),the residual chars were analyzed by energy dispersive X-ray spectrometry,and the mechanical property was characterized by universal testing machine.The results showed that no significant agglomeration was observed in the PET matrix for BOZ and SLS;when the mass ratio of BOZ and SLS was 1∶0.5 and the total addition amount was 10.0％(by mass fraction),the crystallinity,melting temperature and residual char of the polyester composite were higher than those of PET;the LOI value of the polyester composite was increased to 26.4％,the UL-94 reached V-1,and the melt dripping during combustion was effectively suppressed;residual char analysis indicated that the flame retarding of the polyester composite followed the condensed phase flame-retardant mechanism;the tensile strength and elongation at break of the polyester composite decreased compared to pure PET.However,the Young's modulus of the polyester composite increased compared with the pure PET.This study can serve as reference for studying the flame-retardant properties of polyester composites.
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