Nitrile rubber

About: Nitrile rubber is a research topic. Over the lifetime, 4871 publications have been published within this topic receiving 44700 citations. The topic is also known as: nitrile butadiene rubber & nitrile.

Toughening mechanisms in elastomer-modified epoxies Part 1 Mechanical studies

Abstract: Proprietes mecaniques de melange resines epoxyde-caoutchoucs liquides (copolymeres d'acrylonitrile et de carboxybutadiene). Mecanisme etudie par dilatometrie en etirage uniaxial

The chemistry of polymer-clay hybrids

Abstract: There are many organic-inorganic hybrid materials, or molecular composites, in biomineral systems such as bones, teeth, shells and so on. Owing to their complexity a synthetic approach to these materials has not fully developed. Recently, however, synthetic methods have been proposed to prepare artificial organic-inorganic hybrid materials. One is the sol-gel method using metal alkoxides and organic molecules. Another method is the utilization of intercalation reactions of clay minerals. In this paper we review our research in the latter field. We have prepared several polymer-clay hybrids, in which polymers are nylon 6, nitrile rubber and others. They, when molded, have excellent mechanical, thermal and chemical properties compared with unfilled polymers and/or conventional composites. Syntheses, structures and application of the hybrids are presented. In the hybrids negatively charged silicate (clay mineral) and positively charged polymer-ends are directly bonded through ionic bonds. The mechanism of reinforcement is also discussed with the results of CP-MAS NMR and pulsed NMR studies.

Microwave absorbing properties of a thermally reduced graphene oxide/nitrile butadiene rubber composite

Abstract: Reduced graphene oxide (RGO) with a layered and porous structure was synthesized by thermal exfoliation of graphite oxide. Synthesized RGO is very light weight and flaky. The formation of RGO was studied using Fourier transform infrared and Raman spectroscopies, X-ray diffraction and scanning electron microscopy. Composites were prepared by dispersing 2%, 4% and 10% by weight of the synthesized RGO into nitrile butadiene rubber (NBR) matrix. Microwave absorption properties of RGO/NBR composites were investigated by measuring their complex permittivity and permeability by using waveguide method. Simulation studies show that 10 wt.% of graphene oxide in NBR matrix exhibits high values of reflection loss (>10 dB) over a wide frequency range 7.5–12 GHz and maximum loss is 57 dB at 9.6 GHz at a thickness of 3 mm.

Reaction-induced phase decomposition in polymer blends

Abstract: Spinodal decomposition induced by chemical reaction is observed in an epoxy/ polyethersulphone (PES) system having a lower critical solution temperature (LCST) type phase diagram. The binary mixture is homogeneous at its curing temperature (< LCST). When the cure reaction proceeds, the system is thrust into a two-phase regime by the LCST depression caused by a molecular weight increase and phase separation then takes place via spinodal decomposition. Reaction-induced spinodal decomposition yields a variety of two-phase structures: interconnected globule structures, isolated domain structures with uniform domain size, and bimodal domain structures, depending on the relative rates of the chemical reaction and the phase separation. This cured epoxy/PES is a tough thermoset material which has been used as a matrix resin for CFRP. A new high-impact poly(methyl methacrylate) (PMMA) (PMMA particles/poly(ethylene-covinylacetate) (EVA) matrix), can be obtained by radical polymerization of an 80/20 MMA/EVA mixture. Polyimide/silica hybrid materials with excellent heat resistances were also obtained by the sol-gel method. A very high strength rubber (~60 MPa) was obtained by peroxide cure of a hydrogenated nitrile rubber/zinc dimethacrylate mixture. Structure formation in reaction-induced spinodal decomposition has been modelled by computer simulation of the growth of a concentration fluctuation under a successive increase in thermodynamic quench depth.