Novel blends of acrylonitrile butadiene rubber and polyurethane-silica hybrid networks

Abstract

Abstract. Novel blends of acrylonitrile butadiene rubber (NBR) and polyurethane-silica (PU-SiO 2 ) hybrid networks have been prepared by melt blending. The PU-SiO 2 hybrid networks were formed via the reaction of NCO groups of NCO-terminated PU prepolymer and OH groups of SiO 2 in the absence of an external crosslinking agent (i.e. alcohols and amines) during the curing process of NBR. Both in the neat PU-SiO 2 system and the NBR/(PU-SiO 2 ) system, the NCO-terminated PU prepolymer could be crosslinked by SiO 2 to form PU-SiO 2 hybrid networks. The effects of PU-SiO 2 introduction into the NBR, on the properties of the resulting blends were studied. It was found that the vulcanization was activated by the incorporation of PU-SiO 2 . Transmission electronic microscopy (TEM) studies indicated that the interpenetration and entanglement structures between NBR and PU-SiO 2 increased with increasing PU-SiO 2 content and the quasi-interpenetrating polymer networks (quasi-IPN) structures were formed when the PU-SiO 2 was 50 wt% in the NBR/(PU-SiO 2 ) systems. The microstructures formed in the blends led to good compatibility between NBR and PU-SiO 2 and significantly improved the mechanical properties, abrasion resistance and flex-fatigue life of the blends.

Reinforcing styrene butadiene rubber with lignin-novolac epoxy resin networks

“…Epoxy resins also have been synthesized by an insitu vulcanization to reinforce SBR [19]. Meanwhile, various interpenetrating polymer networks in the rubber compounds have been prepared [20][21][22][23]. However, to the best of our knowledge, there is no report about lignin-novolac epoxy resin networks reinforced SBR.…”

Production and characterization of poly(urea-urethane) elastomers synthetized from rapeseed oil-based polyols. Part I. Structure and properties

“…Vegetable oils are triglycerides and often have at least one unsaturated fatty acid molecule in their chemical structure [28,29]. Many types of vegetable oils (from rapeseed, tung, linseed, canola, sunflower, and soybean) have been tested and reported for polyol synthesis as polyurethane precursors [7,17,[30][31].…”

Noncovalent assembly of carbon nanofiber–layered double hydroxide as a reinforcing hybrid filler in thermoplastic polyurethane–nitrile butadiene rubber blends

“…Polymer blends are prepared by a combination of at least two polymers with properties that are different from their individual components . They can be divided into immiscible, miscible, and compatible polymer blends.…”

“…However, considerable attention has been focused on compatible polymer blends because of the attainment of balanced properties . Furthermore, these polymer blends, having a variety of nanofillers, are capable of having properties of polymer blends and the merits of polymer nanocomposites . In view of this, the blending of thermoplastic polyurethane (TPU) with acrylonitrile butadiene rubber (NBR) has experienced appreciable recognition for its applications in gaskets/coextrusion automotive gaskets, tubing pipes, protective covers, grips, and so on .…”

“…prepared TPU:NBR blends with various compositions (30:70, 50:50, and 70:30 w/w) and inferred the formation of the cocontinuous phase in TPU:NBR (50:50) blend due to its uniformly dispersed phases. Furthermore, there exist only limited works on carbon black, LDH, and silica filled nanocomposites of TPU/NBR blends . However, no work has been reported to the best of our knowledge to study the change in the properties of TPU/NBR blend filled with CNF–LDH hybrids as nanofillers.…”