Title: COMPARISON OF ALUMINIUM HYDROXIDE AND MAGNESIUM HYDROXIDE AS FLAME RETARDANTS IN SEBS-BASED COMPOSITES
Page Range: p.415-422
Author(s): Xiao W; Kibble K A
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 16
Issue No: No.7
Abstract
The flame retardancy and mechanical properties of composites consisting of blends of oil-filled styrene-ethylene/butylene-styrene block copolymer (SEBS) and polypropylene (PP) containing aluminium hydroxide (ATH) or magnesium hydroxide (MH) as flame-retardant fillers were examined. The limiting oxygen indices (LOIs) of the filled composites increased markedly with increasing ATH or MH content. The LOIs of the ATH system were higher than those of the corresponding MH-containing systems. When MH was introduced progressively into ATH-filled composites at a constant combined filler loading of 65 wt%, the LOI decreased only when MH/ATH ratio exceeded 40%. The tensile strength and elongation at break (EAB) of composites containing less than 50 wt% of filler decreased with increasing filler content; the EAB of composites filled with MH were slightly higher than those of composites containing ATH, but there was little difference in their tensile strengths. At filler loadings of more than greater than 50 wt%, the tensile strength levelled off, but the elongation was markedly reduced. For a combined filler loading of 65 wt%, the elongation at break increases from around 180 to 200% for a progressive increase in the MH/ATH ratio up to 40%, and there was a large increase in the EAB to around 300% when the MH ratio reached 55-60%; thereafter the EAB fell. ATH and MH were also shown to increase the thermal stability of the SEBS-based composites. 26 refs.
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