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MgCO 3  and 2ZnCO 3 ·3ZnO·4H 2 O (AZC) as flame-retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC) was evaluated using limiting oxygen index (LOI), smoke density rating (SDR) tests, scanning electron microscopy (SEM) and thermogravimetry analysis (TGA). The activation energy (E a ) of the original and flame retardant PVCs’ degradation processes was calculated by the Vyazovkin method. The results showed that the AZC can be used as a synergistic agent for MgCO 3  as flame retardants agent of flexible PVC. The composites of MgCO 3  and AZC cannot only decrease the initial decomposition temperature and increase the weight loss rate in the first stage, but also can promote the char formation in the second stage. The AZC decreased the Ea of the degradation reaction of PVC in the first stage and MgCO 3  increased the Ea in the second stage, which means that the AZC combined with MgCO 3 , catalyzed the dehydrochlorination, promoted the early crosslinking for the PVC compound and improve the stability of the char residue. The SEM results also show that the char residue of MgCO 3 /AZC treated sample has a continuous and denser structure, which can be used as a barrier for the PVC bulk.

The synergism of MgCO 3 and 2ZnCO 3 ·3ZnO·4H 2 O as flame retardants and smoke suppressants for flexible poly(vinyl chloride) (PVC)