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Mechanical and sorption properties of poly(ethylene-co-vinyl acetate)(EVA) compatibilized acrylonitrile butadiene rubber/natural rubber blend systems

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Abstract

Poly (ethylene-co-vinyl acetate) (EVA) has been used as a compatibilizer for heterogeneous natural rubber/acrylonitrile butadiene rubber (NR/NBR) blends. NR/NBR (50/50) blends were compatibilized with varying amounts, from 0 to 10 parts per hundred rubber (phr), of EVA. The compatibility of the blend components in presence of EVA has been evaluated in terms of mechanical and sorption characteristics. The mechanical properties were found to be improved by the addition of EVA upto 6 phr. The solvent resistance of the compatibilized samples has been observed to be higher compared to the uncompatibilized blends; attributed to the increased interfacial adhesion between the blend components. DSC studies showed a shift of glass transition temperatures of the blend components towards higher temperatures indicating increased rigidity of the matrix in presence of EVA.

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Abbreviations

T g :

glass transition temperature

M 90 :

90% of maximum torque

M 2 :

Scorch time torque

t 90 :

time required to achieve 90% of the maximum torque (optimum cure time)

T 2 :

Scorch time

R H :

cure rate

Q t :

moles of solvent sorbed by 0.1 kg of polymer blend at time ‘t’

ν :

degree of crosslinks

ρ p :

density of the polymer blend

V s :

molar volume of the solvent

V r :

volume fraction of blend in the fully swollen state

χ :

polymer-solvent interaction parameter

M c :

molar mass between crosslinks (g/mol)

D :

diffusion coefficient

θ :

Slope of the initial portion of plot of Q t versus \( {\sqrt t } \)

D* :

intrinsic diffusion coefficient

\( M_{\infty } \) :

mass of solvent uptake at equilibrium

M p :

initial polymer mass

θ p :

slope of the steady state linear portion of the Q t versus time relationship

\( {\ell } \) :

thickness of the membrane

A :

permeating area of the membrane

\( \overline{P} \) :

intrinsic permeability of the membrane

Θ:

Time lag

\( Q_{\infty } \) :

moles of solvent sorbed by 0.1 kg of polymer blend at equilibrium

T :

temperature

t :

time

h :

initial thickness of the sample

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Authors and Affiliations

  1. National Institute of Technology, Calicut, 673 601, Kerala, India

    Prajitha Kumari, Shyla George & G. Unnikrishnan

  2. Mohammed Abdurahiman Memorial Orphanage College, Manassery, Mokkam, Calicut, 673602, Kerala, India

    C. K. Radhakrishnan

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  1. Prajitha Kumari
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  2. C. K. Radhakrishnan
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  3. Shyla George
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  4. G. Unnikrishnan
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Correspondence to G. Unnikrishnan.

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Kumari, P., Radhakrishnan, C.K., George, S. et al. Mechanical and sorption properties of poly(ethylene-co-vinyl acetate)(EVA) compatibilized acrylonitrile butadiene rubber/natural rubber blend systems. J Polym Res 15, 97–106 (2008). https://doi.org/10.1007/s10965-007-9148-0

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