PP/POE thermoplastic elastomer prepared by dynamic vulcanization and its flame retardant modification

Abstract

Flame retardant thermoplastic elastomer (TPE) with excellent mechanical properties and thermal oxidative aging resistance was prepared by dynamic vulcanization technology with ethylene-octene copolymer (POE) and polypropylene (PP) as raw materials. The paper first discussed the effect of the amount of vulcanizing agent on the properties of PP/POE TPE. Based on the study of tensile strength, elongation at break, cross-section morphology, processability and aging properties of TPE, it was found that the TPE prepared with 0.6 phr of bis(1-(tert-butylperoxy)-1-methylethyl)-benzene (BIPB) and 40/60 of PP/POE had the best properties. Then silicone powder (GM) is added to the traditional low-halogen bromine-phosphorus flame retardant system for flame retardant modification. The results show that the addition of GM can effectively enhance the stability of the carbon layer, prevent the material from dripping during combustion, and increase the residual carbon content of TPE at 800°C. When 3 phr of GM is combined with a bromine-phosphorus system. The comprehensive performance is the best, the limiting oxygen index (LOI) of TPE increased to 29.8%, reaching the V-0 level. At the same time, the processing fluidity and aging resistance of TPE materials have also been improved.

Novel covalent adaptable networks (CANs) of ethylene/1-octene copolymers (EOCs) made by free-radical processing: comparison of structure–property relationships of EOC CANs with EOC thermosets

“…14,15 These strong, physical cross-links provide EOCs with elasticity and strength, and EOCs are desirable as low-cost impact modifiers and tougheners in thermoplastic elastomers, foams, and shape memory polymers for applications like footwear, cushioning, and catheters. [16][17][18][19][20][21][22][23] EOCs are common components in blends with other polymers such as polypropylene (PP), [24][25][26][27][28] ethylene propylene diene monomer (EPDM) rubber, [29][30][31][32] ethylene-vinyl acetate copolymer (EVA), [33][34][35] and polydimethylsiloxane (PDMS). 36,37 Like PE, EOCs and their blends may be vulcanized or covalently crosslinked using radical initiators such as peroxides to enhance properties like elasticity and temperature resistance.…”

Advancements in flame-retardant strategies for lithium–sulfur batteries: from mechanisms to materials

“…Flame-retardant materials containing halogen elements often achieve the purpose of flame-retardance through the gas phase. 115 Yan et al 53 reported the fabrication of a cathode based on the ring-opening reaction and the following nucleophilic aromatic substitution reaction of tetrafluoro hydroquinone (TFHQ) (Fig. 3b).…”

Improved processability for ultra‐high molecular weight polyethylene/polyolefin elastomer composites: Effect of ethylenevinyl acetate copolymer

“…11 Among various types of TPEs, polyolefin elastomer (POE) is produced using metallocene catalysts, resulting in an eethylene-octene copolymer structure. POE offers a unique combination of high modulus and flexibility 12,13 and serves as the matrix material in UHMWPE composites, providing flexibility and lightweight.…”