Properties and characterization of aluminum hydroxide and barium sulfate filled polypropylene copolymer

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2003

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Can, Semra

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Flammability of polymers has been receiving much attention with the advancements in the modern polymer industry. The addition of flame retardant fillers to the polymer matrix is a common method to control the flammability of polymers. Different types of additives are employed as flame retardants namely; compounds based on halogens (CI and Br), nitrogen, organophosphorus and inorganics. Among them, Al(OH)3 functions as effective smoke suppressant in addition to reducing polymer burning rate. The objective of this study was to investigate the mechanical and flammability properties of Al(OH)3 and BaS04 filled polypropylene (PP). The improvement in flame retardance generally causes a reduction in strength properties, especially impact strength. BaS04 was added to increase impact strength of filled PP composites. To optimize mechanical and flammability properties filler amount was fixed at 30% by weight. Prepared compositions are: Pure PP, 0% Al(OH)3 (30% BaS04), 10% Al(OH)3, 15% Al(OH)3, 20% Al(OH)3, 30% Al(OH)3. Tensile and impact properties of pure and filled PP were studied. The morphology and thermal behaviors of all compositions were examined with scanning electron microscopy (SEM) and differential scanning calorimetry (DSC), respectively. The 20%A containing composition gave sufficiently good tensile and impact properties. SEM studies showed that presence of aggregated Al(OH)3 particles led to low interfacial adhesion between them and PP ending up with decreased mechanical strength. Flammability tests indicated a decrease in burning rate proportional to Al(OH)3 incorporated.

Subject Keywords

Flammability, PP, Al(OH)3, BaSO4 fillers

URI

https://hdl.handle.net/11511/13203

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

S. Can, “Properties and characterization of aluminum hydroxide and barium sulfate filled polypropylene copolymer,” M.S. - Master of Science, Middle East Technical University, 2003.