Mechanical, thermal and transport properties of nitrile rubber (NBR)—nanoclay composites

Balachandran, Meera; Bhagawan, S. S.

doi:10.1007/s10965-011-9809-x

Cited by 52 publications

(22 citation statements)

References 47 publications

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“…As seen, the R134a permeation coefficient through NBR is 7.5×10 −15 m 2 /S, which is 15 times greater than the R134a permeation coefficient through BIIR. The R134a permeability decreases in the order of NBR>ECO>BIIR, which is accounted for by their structure and chemistry [24]. The terminal dimethyl group in the BIIR molecule endows BIIR rubber with a tightly packed molecular structure compared to ECO and NBR materials.…”

Section: Resultsmentioning

confidence: 99%

Transport behavior of R134a refrigerant through rubber composites

2015

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The transport behavior of commercial R134a (1, 1,1,2-tetrafuoroethane) refrigerant including its permeability, adsorption, and diffusion through rubber composites were investigated. Butadiene-acrylonitrile rubber (NBR), brominated butyl rubber (BIIR), and epichlorohydrin rubber (ECO) were used as a matrix, while silica, carbon black, mica sheet, and graphite were used as fillers in the present study. The effects of rubber structure and geometry, surface polarity, as well as loading of filler on transport behavior were studied to correlate transport parameters with the rubber structure and filler nature. The R134a permeation in rubber composites was largely dominated by diffusion rather than solubility. The polarities of rubber and filler played dominant roles in determining the solubility, whereas the structure of rubber and the shape and loading of filler exerted a stronger effect on diffusion than solubility. Nonpolar and layered graphite-filled BIIR rubber composites showed the lowest permeability to R134a. Additionally, shell-like free volume theory was applied to reasonably explain R134a transport behavior.

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Section: Resultsmentioning

confidence: 99%

Transport behavior of R134a refrigerant through rubber composites

2015

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“…Among the different types of polarization possible in a material viz. (i) electronic polarization, (ii) atomic polarization, and (iii) orientation polarization, in polar polymers, a major part of the total polarization is contributed by orientation polarization. For each type of polarization, the time required for attaining the equilibrium level varies with the nature of polarization.…”

Section: Resultsmentioning

confidence: 99%

EPDM–chlorobutyl rubber blends in γ‐radiation and hydrocarbon environment: Mechanical, transport, and ageing behavior

Ashok

Balachandran

Lawrence

et al. 2017

J of Applied Polymer Sci

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In nuclear applications, ethylene propylene diene monomer (EPDM) rubber is the material of choice as gaskets and Orings due to its radiations resistance. In nuclear fuel reprocessing, in addition to radiation, the elastomeric components have to withstand paraffinic hydrocarbons as well. But, EPDM has poor resistance to hydrocarbons. To enhance the durability of EPDM in such environments, EPDM-chlorobutyl rubber (CIIR) blends of varying compositions were developed and characterized for mechanical, thermal, dielectric, and solvent sorption behavior. Spectroscopic and morphological analysis was used to evaluate the compatibility of blends. Due to synergistic effect, the optimal composition of blends with superior mechanical properties and solvent resistance were found to be 60% to 80% EPDM and 20% to 40% CIIR. The optimized blends were irradiated with gamma rays at cumulative doses up to 2 MGy. Based on spectroscopic, morphological, mechanical, thermogravimetric, and sorption properties, blend containing 80% EPDM was found to have superior retention of properties after irradiation.

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“…Rubber matrix region filled up with nanofiller particles at loading (a: 0 phr, b: 1phr, c: 3phr, d: 5phr and e: 7phr) …”

Section: Resultsmentioning

confidence: 99%

Physical and Mechanical Properties of ENR Compatibilized NR/NBR Blends Reinforced Nanoclay and Nanosilica

Romli

Mamauod

2017

Macromolecular Symposia

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Summary Properties of the unfilled rubber blends (Natural rubber, NR and Nitrile Butadiene Rubber, NBR) were poor due to the absence of reinforcing agent. However, the strength of compound had been improved with the addition of nanofiller. There were two (2) types of nanofillers that had been introduced which are nanoclay (NC) and nanosilica (NS). NR/NBR composites were prepared by open milling process where different amount of nanofiller was added ranging from 1 until 7 phr. There are a few possibilities might occur when using small particles size of fillers especially in term of interaction between rubber‐filler and filler‐filler interaction. Apart from that, different polarity and composition of both rubbers were influenced the interaction between filler and rubber phases. The interaction between non‐polar and polar rubber was enhanced using epoxidized natural rubber (ENR). The rubber compound was cured via a conventional sulphur vulcanization system. The cure characteristic result shows that the incorporation of nanofiller does not affect much on the t90. The physical and mechanical properties of epoxidized natural rubber (ENR) compatibilized NSi‐NR/NBR blends were determined by conducting the density measurements, hardness and tensile tests. The NC filler gave the highest tensile strength compared to NS. On top of that, reduction trend on the tensile strength observed at 3 phr of NS loading due to the formation of NS aggregates. The values of moduli, hardness and densities of vulcanizates increased as the nanofiller loading increased. It occurs due to better filler dispersion in the rubber matrix and strong interaction between filler‐rubber phases. The result shows that NC has more pronounce effect on the physical and mechanical proportion of the rubber vulcanizates.

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Mechanical, thermal and transport properties of nitrile rubber (NBR)—nanoclay composites

Cited by 52 publications

References 47 publications

Transport behavior of R134a refrigerant through rubber composites

Transport behavior of R134a refrigerant through rubber composites

EPDM–chlorobutyl rubber blends in γ‐radiation and hydrocarbon environment: Mechanical, transport, and ageing behavior

Physical and Mechanical Properties of ENR Compatibilized NR/NBR Blends Reinforced Nanoclay and Nanosilica

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