Rubbery epoxy

Epoxy network Molecular weight of polyether chain of Jeffamine (g/mol) TensUe strength (MPa) Elongation at break (%) 

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L. Matejka, O. Dukh, and J. Kolarik, Reinforcement of crosslinked rubbery epoxies by in-situ formed silica, Polymer 1449-1459 (2000). 

Jan Jansen, B. J. P., Tamminga, K. Y., Meijer, H. E. H., Lemstra, P. J. Preparation of thermoset rubbery epoxy particles as novel toughening modifiers for glassy epoxy resins. Polymer 40... 

Flexural strain reflects the flexibility of a material. Highly flexible resins like rubbery epoxy, polyurethane, and modified resins do not break even after a large deflection determination of ultimate flexural strength is impractical for them. The relevance of mechanical tests depends on the form in which the material is going to be used. If a material is to be used as a beam, then a flexural test is more relevant than a tensile test. 

Liquid crystalline epoxies have potential applications for electro optics, aconstics, and in information technology. The rubbery epoxies exhibit very high damping factor (>1) and can be used for vibration damping applications, as discussed next. 

Figure 3.16 Master curves of loss tangent versus frequency for a rubbery epoxy at different reference temperatures. Reprinted with permission from D. Ratna, N.R. Manoj, L. Chandrasekhar and B.C. Chakraborty, Polymers for Advanced Technologies, 2004,15,10,583 2003, John Wiley and Sons Publishers...

Figure 7.13 Effect of clay loading on tensile properties of rubbery epoxy network tensile strength ( - - ) and % elongation at break (- - -). Reprinted from D. Ratna, B.C. Chakraborty, H. Dutta and A.K. Banthia, Polymer Engineering and Science, 2006, 46,1667 2006, John Wiley and Sons Publishers...

Matejka L, Dukh 0 and Kolaf fk J (2000) Reinforcement of crossliuked rubbery epoxies by formed silica, Po/ymer 41 1449-1459. 

Carbon black nanoparticle-reinforced polyisoprene applied in electric heating elements and resistors as thermodynamically inactive materials for a high dielectric constant (>1000) has been studied. The dissipation factor (tanS) of this carbon black nanocomposite was high (Xu and Wong, 2005). However, improving the dispersion of the nanoparticles in polymer lowers the percolation threshold of composites (Raza et al., 2012 Sumfleth et al., 2011). The electrical conductivity of rubbery epoxy/carbon black nanocomposites at 8 wt% filler loading was 2 x 10 S/m, which matched the criterion of electrical conductivity for electrostatic applications (10 S/m) (Ali Raza et al., 2012 Knite et al., 2004 Sasha Stankovich et al., 2006). 

Ali Raza, M., Westwood, A., Stirhng, C., Brydson, R., Hondow, N., 2012. Effect of nanosized carbon black on the morphology, transport, and mechanical properties of rubbery epoxy and silicone composites. Journal of Applied Polymer Science 126 (2), 641-652. 

Raza, M.A., Westwood, A., Stirling, C., 2012. Carbon black/graphite nanoplatelet/rubbery epoxy hybrid composites for thermal interface applications. Journal of Materials Science 47 (2), 1059-1070. 

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