Abstract
A novel halogen-free microcapsule flame retardant, carbon microspheres coated with magnesium hydroxide microcapsule and polyethylene terephthalate (PET) (MMH@CMSs) were synthesized. Then, the prepared MMH@CMSs were introduced into PET resin to prepare MH@CMSs/PET composites. The morphology and structure of MMH@CMSs were characterized by SEM, TEM and FTIR, which showed that an organic shell layer of PET as capsule wall was coated on the surface of MH@CMSs. The prepared MMH@CMSs/PET reached the LOI of 27.4 with only 1wt.% MMH@CMSs, and UL94 test results showed that MMH@CMSs/PET reached UL94 V-0 rating when the dosage of MMH@CMSs was over 1.5wt.%. Tensile properties results showed that the microcapsule treatment of MH@CMSs significantly improved the mechanical properties of the composite, and the tensile strength of 1wt.% MMH@CMSs/PET increased by 83.9% compared with 1wt.% MH@CMSs/PET. The flame retardant mechanism was studied by cone calorimeter measurement, TGA, TGA-FTIR, SEM and FTIR. The results disclosed that MMH@CMSs enhanced the thermal stability of PET in air, and promoted PET to form a dense and continuous protective char layer that effectively blocked heat transfer and combustible gas release.
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