Transport properties of crosslinked acrylonitrile butadiene rubber/poly(ethylene-co-vinyl acetate) blends

Varghese, Hima; Bhagawan, S. S.; Thomas, Sabu

doi:10.1002/(sici)1099-0488(19990801)37:15<1815::aid-polb6>3.0.co;2-e

Cited by 31 publications

(21 citation statements)

References 38 publications

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“…It is found that the liquid sorption behavior follows the order sulfur > mixed > DCP. We observed the same order for our earlier systems also18, 24, 25 The differences in the solvent uptake behavior for a given blend composition, with different crosslinking systems, is due to the different types of crosslinks present in them. The sulfur vulcanization introduces flexible polysulfidic linkages between the macromolecular chains.…”

Section: Resultssupporting

confidence: 76%

Mass transfer characteristics of natural rubber/ethylene vinyl acetate blends

Sujith

Radhakrishnan

Unnikrishnan

et al. 2003

J of Applied Polymer Sci

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ABSTRACT:The transport behavior of natural rubber/ ethylene vinyl acetate (NR/EVA) blends has been investigated using aromatic hydrocarbons as probe molecules, in the temperature range of 26 -56°C. It has been observed that the solvent uptake decreases with increase in the EVA content of the blends. The blends were crosslinked by three systems, viz. sulfur, dicumyl peroxide (DCP), and a mixture consisting of sulfur and peroxide. The DCP crosslinked system exhibited the lowest solvent uptake. The differences in the transport behavior of the blends, crosslinked by different modes, has been described in terms of the nature of crosslinks introduced between the macromolecular chains during vulcanization. The mechanism of transport has been found to deviate from the regular Fickian behavior, observed with conventional rubbers, with an increase in EVA in the blends. The dependence of the transport coefficients on blend composition, crosslinking systems, nature of penetrants, and temperature was studied. The blend-solvent interaction parameter, enthalpy, and entropy of sorption have also been estimated from the transport data.

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Section: Resultssupporting

confidence: 76%

Mass transfer characteristics of natural rubber/ethylene vinyl acetate blends

Sujith

Radhakrishnan

Unnikrishnan

et al. 2003

J of Applied Polymer Sci

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“…A correction for swelling is made by incorporating V rf , thus giving intrinsic diffusion coefficient D * as Equation (9) [35]: (9) The values of D * at 28°C for 10 phr filler loaded EVA composites are given Table 5. It can be seen from the table that for a given solvent, the diffusion coefficient values are in the order: SRF > HAF > ISAF filled composites.…”

Section: Diffusion Coefficientmentioning

confidence: 99%

Solvent transport through carbon black filled poly(ethylene-co-vinyl acetate) composites

Dasan¹,

Unnikrishnan²,

Purushothaman³

2008

Express Polym. Lett.

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Abstract. Poly(ethylene-co-vinyl acetate) (EVA) was reinforced with three different types of carbon black viz. semi-reinforcing furnace (SRF), high abrasion furnace (HAF) and intermediate super abrasion furnace (ISAF). The solvent transport by the composites were analyzed using benzene, toluene and xylene as penetrant molecules. The observed cure characteristics and solvent uptake behaviour of the composites has been explained on the basis of particle size of the filler and bound rubber content. The mode of transport in all the cases was found to be anomalous. A sorption-desorption-resorption (S-D-RS) experiment was carried out to study the physical changes in the polymer matrix, associated with the transport of the solvents through the composites.

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“…There are several reports about NBR/EVA blends in the literature [1,2,[5][6][7][8][9][10][11][12][13][14]. Thomas et al [2,[5][6][7][8][9][10][11] studied the cured and uncured NBR/EVA blends having different amounts and kinds of fillers as well as curing systems based on peroxide, sulfur and their mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…Thomas et al [2,[5][6][7][8][9][10][11] studied the cured and uncured NBR/EVA blends having different amounts and kinds of fillers as well as curing systems based on peroxide, sulfur and their mixtures. Soraes et al [1,12,13], on the other hand, investigated the effect of mercapto-modified EVA on rheology, mechanical and dynamic mechanical properties of the uncured and cured blends.…”

Section: Introductionmentioning

confidence: 99%