Nitrile Rubber Properties Pdf Download 'LINK'
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Here you will find our Nitrile specifications chart which can also be downloaded in PDF. The Nitrile rubber properties that are listed below are for our most popular Nitrile 70 durometer (70A) rubber material compound. Make sure you review all of our other popular materials to make sure that the material you choose is correct for your application. If you need properties that are slightly different than the ones listed below, we can compound the formulation of the rubber material so that the Nitrile rubber specifications suit your needs. Finding the correct material especially if you are using it for an O-ring seal is important as the seal can degrade easily if the material is not compatible.
Nanocellulose antioxidant (Aox-NCC) was used as reinforcement and crosslinking agent in nitrile butadiene rubber (NBR) composites. The crosslinking density and volume of rubber bonded in the matrix were increased up to 3 phr and no significant improvement between 4 phr and 5 phr was recorded. The interactions of gallic acid and NCC was found to occur between the -OH and -COOH groups, as revealed by Fourier Transform Infra-Red (FTIR) and Nuclear Magnetic Resonance (NMR) analysis. Crystallinity index of Aox-NCC was increased more than 11 %, recorded by X-ray diffraction (XRD) analysis. Meanwhile, the thermal stability of Aox-NCC was increased 30°C, analyzed by thermogravimetry (TG). With the addition of 3 phr Aox-NCC, tensile strength and modulus at 500 % for NBR composites were increased significantly up to 20 %. There was no significant improvement on modulus at 100 %, modulus at 300 %, elongation at break and tear strength. The degradability of NBR composites within 6 months period was improved significantly at 5 phr of Aox- NCC. Increase in carbonyl group after soil burial test with the existence of cracks, voids and degradable parts of NBR composites were revealed. This demonstrated that, Aox-NCC plays a secure function to reinforce NBR composites.
Carboxylated nitrile rubber (XNBR) is a terpolymer made from the polymerization of acrylonitrile and butadiene monomers with a third, carboxyl-containing monomer. Compared with conventional NBR, XNBR has higher tensile strength, modulus, and hardness, but the key performance advantage is the significant improvement in abrasion resistance. Nipol NX775 utilizes proprietary ZEON technology to offer enhanced scorch safety over other grades of XNBR, allowing for a wider processing window and making it a viable option in difficult to mold parts.
ZEON makes many grades of acrylonitrile butadiene copolymers that can enhance the properties of flexible PVC compounds. These products are very easy to incorporate into PVC compounds due to the fact that they are available as a liquid or fine powder. Some of the benefits of introducing NBR as a modifier into a PVC compound include improved mechanical properties, impact resistance, chemical resistance, and low temperature flexibility.
Non-agglomeration and dispersion of silica nanoparticles in polymers and their interfacial interactions to polymer matrix are the most important factors that influence nanocomposites performance. In this work, vinyltriethoxysilane (VTES) as a low VOC emission coupling agent was used for surface modification of silica nanoparticles to prepare better dispersion in nitrile rubber (NBR) and improve its interfacial interactions to silica nanoparticles. The results of X-ray photoelectron spectroscopy, thermogravimetric analysis and Fourier transform infra-red spectroscopy demonstrated successful attachment of VTES molecules on the surface of silica nanoparticles. Dispersion of the modified silica nanoparticles in NBR matrix was studied using field emission scanning electron microscopy and rubber process analysis. Results demonstrated that VTES significantly improved dispersion of nanoparticles in rubbery matrix. The bound rubber content showed that VTES effectively built a bridge between the silica nanoparticles and the rubber matrix that led to promising mechanical performances and strong interfacial interactions. Effect of nanoparticle content on the mechanical performances (static/dynamic) of the NBR was evaluated. It was found that higher modulus and reinforcement indices was obtained at 3 and 5 wt% of nanoparticles. Moreover, these composites had extremely low rolling resistance, the best wet skid resistance and the lowest Heat-Build up.
Silane coupling agents (SCAs) are of the best modifiers that could reduce the polarity of silica nanoparticles and improve their dispersion in rubber matrix21,22. SCAs could also increase the interfacial interactions between nano silica and rubber matrix23. Rubber composites filled with SCA-modified silica nanoparticles showed better dynamic mechanical and static properties24,25.
Considering the tensile test results, it was concluded that the highest tensile strength and elongation at break obtained at pure nano silica contents of 3 and 5 wt%. However, the amplitude of tensile strength was close to that of pristine NBR due to the poor dispersion of nanoparticles in the rubber matrix and their agglomeration. There were no significant changes in modulus at 100% of the nanocomposites, however, modulus at 300% of the nanocomposites decreased a little because of weak interfacial interactions between pure nano silica and polymer chains. Furthermore, incorporating the nanoparticles to NBR compound did not affect the hardness of nanocomposites especially at lower concentrations. Based on the results, it was generally found that pure nano silica did not improve the curing and mechanical properties of NBR.
Figure 5 compares the curing characteristics of R-GNPs to R-NPs at nanoparticle contents of 3 and 5 wt%. It is clearly seen that by incorporating grafted nanoparticles to NBR compound the curing properties (i.e. crosslinking, cure time and CRI) improved significantly. This was attributed to the stronger interfacial interactions created between VTES grafted nano silica and rubber chains. After hydrolysis of VTES molecules and then condensation on nano silica surface, the hydrophilic nature of nano silica changed to superhydrophobic due to placing vinyl groups like a shell on the outer surface of nanoparticles. The presence of silane molecules eliminated absorbing accelerators on the acidic surface of nano silica that this improved curing rate of the nanocomposite. The optimum curing time (T90) decreased in the R-GNP samples compared to pure nano silica containing samples. Moreover, the MH-ML and CRI values increased significantly in the case of using 5 wt% of grafted nanoparticles in NBR compound. This confirms co-vulcanization of grafted silane molecules with rubber chains that have been obvious in the case of using higher content of grafted nanoparticles (i.e. 5 wt%) in the rubber matrix. The lower cure time in R-GNP samples could be attributed to better dispersion of the nanoparticles in rubber matrix that improved heat transfer in the rubber matrix that helped homogeneous curing.
The bound rubber content could also be used to study the physical interfacial interactions between nano silica and the rubber matrix52,53. The bound rubber content was calculated for the NBR based samples that results are shown in Fig. 7. It was found that the bound rubber formation was not affected by addition of pure nano silica to NBR matrix. However, it was increased for the samples contained grafted nanoparticles. This confirms better diffusion of rubber in to the nano silica agglomerates due to better physical interaction between nanoparticles and rubber matrix. It also facilitates dispersion of nanoparticles that improves the mechanical properties.
Our rubber covering materials (natural rubber, nitrile rubber and synthetic rubber) are available in multiple colors and offer surfaces with excellent grip, good abrasion resistance or high cut and tear resistance.
TUBE: Smooth white nitrileCOVER: White nitrile rubber (abrasion and oil resistant)REINFORCEMENT: Two polyester spirals with dual helix wireTEMPERATURE: -40°F to 180°F
Abstract:With the ever-increasing development in science and technology, as well as social awareness, more requirements are imposed on the production and property of all materials, especially polymeric foams. In particular, rubber foams, compared to thermoplastic foams in general, have higher flexibility, resistance to abrasion, energy absorption capabilities, strength-to-weight ratio and tensile strength leading to their widespread use in several applications such as thermal insulation, energy absorption, pressure sensors, absorbents, etc. To control the rubber foams microstructure leading to excellent physical and mechanical properties, two types of parameters play important roles. The first category is related to formulation including the rubber (type and grade), as well as the type and content of accelerators, fillers, and foaming agents. The second category is associated to processing parameters such as the processing method (injection, extrusion, compression, etc.), as well as different conditions related to foaming (temperature, pressure and number of stage) and curing (temperature, time and precuring time). This review presents the different parameters involved and discusses their effect on the morphological, physical, and mechanical properties of rubber foams. Although several studies have been published on rubber foams, very few papers reviewed the subject and compared the results available. In this review, the most recent works on rubber foams have been collected to provide a general overview on different types of rubber foams from their preparation to their final application. Detailed information on formulation, curing and foaming chemistry, production methods, morphology, properties, and applications is presented and discussed.Keywords: rubber; foam; morphology; curing; characterization; applications 2b1af7f3a8