Antimony/Iron Interactions in Chlorinated Polymer Blends

摘要

The flammability properties of blends of aciylonitrile-butadiene-styrene (ABS) and chlorinated poly(vinyl chloride) (CPVC) have been investigated.Additive-free ABS/ CPVC blends,blends containing an iron(III) based smoke suppressant,basic iron(III) oxide (FeOOH) and blends containing equal amounts of the commercially available flame retardant,antimony(III) oxide (Sb_2O_3) and FeOOH were prepared.Char formation at 650°C,flammability (Oxygen Index) and smoke density.(flaming-mode-NBS Smoke Density Chamber) data was obtained using standard procedures.Char formation in these systems was found to be linearly dependent on the chlorine content of the blends,even in the presence of antimony (III) oxide and basic iron(III) oxide.Oxygen index values for the additive-free blends vary with blend composition (nonlinear) but the presence of FeOOH and Sb_2O_3/FeOOH combinations in the blends raise oxygen index values,especially at low (~20%) chlorine concentrations.Smoke density values for the additive-free blends are linearly dependent on chlorine content,but the additives have different effects on smoke formation,effects that also depend on the chlorine content of the blends.Attempts to relate these changes in flammability parameters to chemical interactions occurring between polymers and additives during thermal decomposition are discussed.J.Vinyl Addit.Technol.