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Dynamic mechanical properties of styrene butadiene rubber and poly (ethylene-co-vinyl acetate) blends

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Abstract

The dynamic mechanical behaviour of uncrosslinked and crosslinked styrene butadiene rubber/poly (ethylene-co-vinyl acetate) (SBR/EVA) blends was studied with reference to the effects of blend ratio, crosslinking systems, a compatibilizer viz. maleic-anhydride grafted poly [styrene-b-(ethylene-co-butylene)-b-styrene] (SEBS-g-MA), frequency and temperature. The two separate tan δ peaks, obtained during DMA, indicated the immiscibility of SBR/EVA system. The damping properties increased with SBR content for uncrosslinked and crosslinked blends. In the case of crosslinked systems, depending upon the type of crosslinking agent used, the glass transition temperature (T g) of SBR phase has been found to be shifted to higher temperatures. The damping characteristics of the blends were observed to be affected by the variations in frequency. The addition of the compatibilizer improved the storage modulus and reduced the damping properties. These results have been correlated with the morphology of the blends, attested by scanning electron micrographs. The activation energy for glass transition has been computed. The experimental data on storage modulus were compared with theoretical predictions.

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Abbreviations

DMA:

dynamic mechanical analysis

SEBS-g-MA:

maleic anhydride grafted poly (styrene-b-(ethylene-co-butylene)-b-styrene)

E′:

storage modulus

E′′:

loss modulus

E*:

complex modulus

tan δ :

dissipation factor

E :

activation energy

T :

temperature

R :

universal gas constant

T g :

glass transition temperature

v :

crosslink density

X C :

fractional crystallinity

SEM:

scanning electron microscopy

EVA:

poly (ethylene-co-vinyl acetate)

SBR:

styrene butadiene rubber

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Authors and Affiliations

  1. Muhammed Abdurahiman Memorial Orphanage College, Mukkam, Calicut, 673602, Kerala, India

    C. K. Radhakrishnan & A. Sujith

  2. National Institute of Technology Calicut, Calicut, 673601, Kerala, India

    Prajitha Kumari & G. Unnikrishnan

Authors
  1. C. K. Radhakrishnan
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  2. Prajitha Kumari
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  3. A. Sujith
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  4. G. Unnikrishnan
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Correspondence to C. K. Radhakrishnan.

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Radhakrishnan, C.K., Kumari, P., Sujith, A. et al. Dynamic mechanical properties of styrene butadiene rubber and poly (ethylene-co-vinyl acetate) blends. J Polym Res 15, 161–171 (2008). https://doi.org/10.1007/s10965-007-9155-1

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