Isolated Protective Char Layers by Nanoclay Network: Significantly Improved Flame Retardancy and Mechanical Performance of TPV/MH Composites by Small Amount of Nanoclay

Abstract

The synergistic effects of organically modified montmorillonite (o-MMT) and magnesium hydroxide (MH) on the flame retardance and mechanical properties of a thermoplastic vulcanizate (TPV) have been investigated. The incorporation of more than 6 phr o-MMT induces a drastically decreased peak heat release rate and smoke production rate while simultaneously enhancing the mechanical properties of the TPV/MH composites. The improvements in both flame retardance and mechanical properties are attributed to the double role of o-MMT in the composites. On the one hand, the increase in viscosity due to o-MMT suppresses the vigorous bubbling caused by polymer pyrolysis. On the other hand, well-dispersed o-MMT serves as a rigid network that prohibits massive shrinkage of both the MH and TPV matrix during burning. Therefore, isolation of the protective chars by the clay network together with MgO is achieved, and such a structure prohibits heat and mass transfer during burning.

Structure and Properties Study of PA6 Nanocomposites Flame Retarded by Aluminium Salt of Diisobutylphosphinic Acid and Different Organic Montmorillonites

“…The improved dispersion of flame-retardant particles in flame-retardant nanocomposites after the introduction of clay platelets has been observed in previous studies. In Cao et al’ studies, the incorporation of OMMT into TPV/MH composites improved the dispersion of MH particles in the polymer matrix and induced the formation of a clay network [ 24 ]. TEM analysis together with XRD results demonstrate that the dispersion of ABPA particles and OMMT platelets are both improved with the incorporation of both.…”

Effects of collagen fiber addition on the combustion and thermal stability of natural rubber

“…Hence, a semi-interpenetrating network (semi-IPN) of CF is important for the flame retardancy modification of NR. This network can block the spread of flame, and has a great anti-dripping effect [49][50][51][52]. The action mechanism and effects of CF and MCF in flame retardancy modification of NR are shown in Fig.…”

Balanced physical properties for thermoplastic silicone vulcanizate‐based polymer composites containing functional filler

“…These efforts include controlling the microstructure of the composite, [ 7,11–12 ] regulating the phase inversion, [ 13–14 ] and improving the dispersion of rubber phase accurately. [ 15–16 ] Besides, introducing various fillers such as carbon materials, [ 17–18 ] silicon materials, [ 19 ] nanoclay, [ 20–21 ] as well as other inorganic fillers [ 22 ] into the general TPVs to enhance some specific performance to broaden their scope of application is another effective method. The most conventional TPVs are usually composed of ethylene‐propylene‐diene (EPDM)/polypropylene (PP) [ 2, 23 ] or ethylene octene copolymer (EOC)/PP [ 24 ] and thermoplastics.…”

“…For example, organically modified montmorillonite (o‐MMT) and magnesium hydroxide (MH) were introduced to improve the flame retardancy and mechanical properties of TPVs. [ 21 ] Nanotitanium dioxide (TiO 2 ) immobilized antioxidant (TiO 2 ‐KH550‐AG) were incorporated as fillers to improve the aging resistance of TPV exposed to ultraviolet. [ 25 ] The novel rice husk ash was also reported to enhance the thermal resistance and elastic properties.…”