Thermal stability, flammability and fire hazard of butadiene-acrylonitrile rubber nanocomposites

Abstract

This article presents the effect of the method of NBR cross linking on the thermal properties, flammability and fire hazard of its nanocomposites containing modified montmorillonite (NanoBent or Nanofil), using test results obtained by means of a derivatograph, oxygen index and cone calorimetry. It has been found that the thermal stability and flammability of the nanocomposites investigated depend on both the rubber network structure and the type of montmorillonite. The nanoadditives used reduce the flammability of cross-linked nitrile rubber and considerably limit its fire hazard.

Thermal properties of polymethylvinylborosiloxanes

“…(1) The presence of two kinds of branching units (boron atoms and methylsiloxane units CH 3 SiO 1.5 ), (2) The different degrees of branching (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15), (3) The different contents of boron, (4) The different values of MWs, (5) The lengths of the siloxane chains between branching points (boron atoms and MeSiO 1.5 units), and (6) The different functionalities (the contents of vinylsiloxane groups).…”

“…PBS cumulated on a PP surface during combustion process and prevented the spreading of a flame, forming a protective coating, and thus deterring any contact with the flame [5]. Other boron compounds (e.g., boric acid and borax) [6,7]; silanes; silicon-containing polymers: siloxanes, silsesquioxanes [6], and inorganic silicates, e.g., modified montmorillonites [8][9][10]; and halloysite nanotubes [11,12] were successfully used as halogen-free fire retardants. Ammonium polyphosphate, microencapsulated with a low molecular weight polydimethylsiloxane-a,xdiol, showed enhanced water resistance and significantly improved flame resistance properties as compared with an unmodified ammonium polyphosphate in a thermoplastic polyurethane composites [13].…”

Thermal stability and flammability of butadiene–styrene rubber nanocomposites

“…The alkaline activation of halloysite as the acidic intercalation reported by the authors [20] was aimed at the exposure of halloysite nanotubes (HNTs) through the removal of higher aliminosilicate acids (alofane acids) from their surface and space between them. The activation consisted in treating halloysite with 5 M NaOH solution for 8 h at a temperature of 60°C.…”

Flammability of vulcanizates of diene rubbers

“…The formation of a spatial network, i.e., the combination of polymer macromolecules with crosswise bonds, prevents this phenomenon to an extent dependent on the chemical constitution and physical structure of elastomer, and the structure of spatial network and cross-link density [2][3][4][5]. The formation of liquid products of thermal decomposition and combustion can be considerably limited or eliminated by fillers added to a polymeric blend, whose cross-linking leads to filled elastomeric materials [5,6]. A particular role in this respect is played by fillers of nano-dimensions, whose use allows one to obtain nanocomposites of unique properties [5][6][7].…”

“…The formation of liquid products of thermal decomposition and combustion can be considerably limited or eliminated by fillers added to a polymeric blend, whose cross-linking leads to filled elastomeric materials [5,6]. A particular role in this respect is played by fillers of nano-dimensions, whose use allows one to obtain nanocomposites of unique properties [5][6][7].…”