Synergistic effect of amino silane functional montmorillonite on intumescent flame‐retarded SEBS and its mechanism

Abstract

A functional modified montmorillonite (F-OMMT) was prepared by intercalating pristine montmorillonite using phosphonium salt and subsequent grafting through alkyl amino silane coupling. The synergistic effect of F-OMMT on the flame retardancy and char-forming mechanism of intumescent flame-retarded polystyrene-b-(ethylene-co-butylene)-b-styrene (SEBS) composite (SEBS/IFR) was investigated. When 2 wt % F-OMMT was introduced to the SEBS/IFR composite, the limited oxygen index (LOI) value of the composite increased from 24.9% to 26.9%, and the peak heat release rate significantly reduced according to microscale combustion calorimeter (MCC) test. The outer char demonstrated that F-OMMT produced dense and intact nanoparticles with a stabilised graphite structure. Meanwhile, F-OMMT helped form a crosslinking network containing large amounts of P, O, N, and Si in the char layer. Along with IFR, the amino functional group on the clay released nonflammable ammonia in the gaseous phase, the enhanced blowing effect can overcome the high-viscosity resistance of SEBS, more intumescent coating with strengthened clay platelets was then produced. In addition, the tensile properties of SEBS/IFR/F-OMMT composite increased evidently for the good dispersion effect. F-OMMT can serve as an effective and environmentally friendly additive for SEBS/IFR composite.

Flame‐retardant expandable polystyrene foams coated with ethanediol‐modified melamine–formaldehyde resin and microencapsulated ammonium polyphosphate

“…The increase is mainly owed to the excellent char‐formation ability of MCAPP and MF resin, as well as the char‐forming reaction between APP and MF resin . The formed char layer, which has excellent thermal stability and barrier property, can isolate the transfer of heat and mass from the polymer to the heat source and prevent the substrate materials from further breaking in a fire . All these results indicate that MCAPP is feasible for improving the flame retardancy of EPS foam.…”

“…The problem of smoke release has been brought to the world's attention now as the dominant reason for serious casualties in a fire . It is necessary to achieve smoke suppression during combustion, especially for building materials.…”

“…It is the poor dispersion of APP in the resin that restricts the formation of a compact residue char, resulting in the decline of the quality of the char layers. By comparison, the residue of the E‐MA75 sample after combustion is quite continuous and compact, exhibiting almost neither voids nor cracks [Figure (b)], a morphology that is more effective in preventing mass and heat transfer . Presumably, compared with APP, MCAPP shows better dispersion and compatibility in the coating resin.…”

Flexible poly(styrene‐ethylene‐butadiene‐styrene) hybrid nanofibers for bioengineering and water filtration applications

“…Therefore, SEBS can be easily processed and modified. Due to the compatibility, it is widely used in hybridization with many different types of polymers such as copolymer coatings, adhesives, sealants, and engineering plastics . In addition, scientific studies have shown that increased concentration of SEBS in hybrid polymer blends could improve breaking elongation and interfacial adhesion, which allows developing the properties of ductility, toughness, and impact‐resistance …”

A facile method for preparation of PGS@ZB‐N and gas‐sol alternating synergistic effect for fire resistance of EVA

“…Benefiting from its structural properties, PGS has drawn emerging interest as a potential alternative to conventional sorbents . As for other applications of clay‐based materials, sepiolite, montmorillonite, and hydrotalcite can be used as flame retardant to improve flame retardance of the polymers dramatically. As one of the core candidates, the flame retardancy applications of PGS were also well considered .…”