Tensile properties and stress whitening of polypropylene/polyolefin elastomer/magnesium hydroxide flame retardant composites for cable insulating application

Abstract

Flame retardant polypropylene (PP) composites were prepared by combining random polypropylene with uncoated and surface-treated forms of magnesium hydroxide filler and elastomeric modifiers, with and without maleic anhydride functionalization. Four types of magnesium hydroxide (MDH) with different surface treatments were compounded at amounts up to 60% by weight to PP/polyolefin elastomer (POE) matrix resin to obtain a series of composites. The tensile strength and elongation at break were measured. MDH coated with polymeric material was found to give a high elongation at break value compared with the values obtained with uncoated and vinyl silane and amino silane coated MDH. Two types of POE, i.e., neat and maleic anhydride grafted POE (POEgMA), were used to investigate the stress whitening of composites in bending deformation. POEgMA used composites showed no stress whitening while neat POE used composites showed whitening when bended.

Extrudate swell behavior of polypropylene composites filled with microencapsulated red phosphorus

“…Recently, the flame retardant for PP have received increasing attention. [8][9][10][11] Aluminum hydroxide (Al(OH) 3 ) and magnesium hydroxide (Mg(OH) 2 ), the kind of halogen-free flame retardants, have been widely used in various polymers such as PP, because of its triple functions: filler, flame retardant, and smoke suppressant. [12][13][14] Microencapsulated red phosphorus (MRP) is a kind of synergist for flame retardant and usually used along with Al(OH) 3 and Mg(OH) 2 in producing flame retardant filled polymer composites.…”

Synergistic effects of hydroxy silicone oil on intumescent flame retardant polypropylene system

“…The compounds used as halogen-free flame retardants in PP include metal hydroxides, phosphorous-containing compounds, phosphorous and nitrogen-containing compounds, etc. Furthermore, metal hydroxides are widely used as flame retardant additives in polypropylene, but the high loading seriously destroys the mechanical properties of polymeric materials [2][3][4][5].…”

Preparation and properties of flame retardant high impact polystyrene

“…However, the fire safety levels of these nanocomposites cannot meet the requirements of UL 94 V tests. Extensive work has also been carried out to investigate the flame retardant properties of aluminum trihydrate, magnesium hydroxide, and some phosphorous compounds [24][25][26][27][28][29], which sometimes replace halogenated compounds as flame retardants and smoke suppressant fillers for thermoplastics.…”