In this study, a novel SbS33- intercalated layered double hydroxide (Sb-LDH) was prepared by simultaneous recovering of LDH structures and intercalation of SbS33- in LDH layers. SbS33- was produced from a natural mineral Stibnite. The prepared Sb-LDH composites remains the hydrotalcite structure with layered geometry and shows higher thermal property than that of LDH. When applied to poly (vinyl chloride) (PVC) composites, Sb-LDH showed limited thermal stability for PVC at the early stage of thermal and thermooxidative degradation processes. However, Sb-LDH could retard the thermal cracking of the carbonaceous conjugated polyene of PVC which may hinder the further degradation, and the moderate amount of Sb-LDH (1 wt.%, 2 wt.%, and 5 wt.%) in PVC resin can retard the process of decarbonation and enhance char formation. Sb-LDH also promoted the transparency of PVC but darkened the color. The optimum amount of Sb-LDH addition is 2 wt.% with optimal overall performance in transparency and thermal stability exhibiting in Sb-LDH-2/PVC. With the advantages of transparency promotion, high temperature resistant and long-term stability, Sb-LDH is a promising thermal stabilizer for PVC, and also has the potential to combine with some short-term co-stabilizers for better thermal stability of PVC, which can be applied on some deep-colored materials, such as disc, sewer pipe and oil pipeline.

Sb intercalated, layered double hydroxides-poly(vinyl chloride) nanocomposites: Preparation, characterization, and thermal stability

251st National Meeting (2016)

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