Polyvinyl chloride(PVC)resin is hard and brittle.Adding fly ash(FA)will increase the hardness of PVC composites and deteriorate the processing plasticity,thus limiting the application range of PVC/FA composites.Dioctyl terephthalate(DOTP)and tris(2-hydroxyethyl)isocyanuric acid(THEIC)were used to improve the mechanical properties of PVC/FA composites.The effects of the ratio of DOTP and THEIC on the thermal stability,mechanical properties and electrical properties of PVC/FA cable composites were investigated.The results show that the combination of DOTP and THEIC can improve the thermal stability and mechanical properties of PVC/FA cable composites.When adding 29 phr DOTP and 1 phr THEIC at the same time,the elongation at break of PVC/FA2 composite is 107.98%.Compared with the composite without plasticizer,the elongation at break of PVC/FA2 is increased by 105.31%.The thermal decomposition temperature in the first stage and the second stage of PVC/FA2 is increased by 11.1℃and 6.0℃respectively,and the processability of the composite is significantly improved.
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