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EPOXY/METHYL METHACRYLATE ACRYLONITRILE BUTADIENE STYRENE COPOLYMER (MABS) BLENDS: REACTION INDUCED VISCOELASTIC PHASE SEPARATION, MORPHOLOGY DEVELOPMENT AND MECHANICAL PROPERTIES

Abstract

This article examines for the first time the effect of the addition of methyl methacrylate acrylonitrile butadiene styrene copolymer (MABS) on the phase separation, morphology and mechanical properties of epoxy system. Blends of epoxy resin/MABS containing 5, 10, 15 and 20 phrMABS were prepared using the solution mixing technique. Homogenous blends obtained by this technique have undergone polymerization reaction induced phase separation process by the introduction of curing agent 4,4′-diaminodiphenyl sulfone (DDS). The optical microscopy analyses revealed that at low concentration of the MABS, the phase separation was by a nucleation and growth process. However, at higher concentration of MABS, the phase separation was by spinodal process as evidenced by the formation co-continuous phase morphology followed by coarsening at later stages leading to phase separated domains. The morphology of the completely crosslinked samples were probed by SEM, TEM and AFM analysis. Phase in phase morphology was noticed in all the compositions as a result of viscoelastic phase separation process due to strong dynamic asymmetry arising from the molecular weight and Tg differences between the component polymers(high molecular weight MABS and liquid epoxy). In other words, the phase separated MABS and epoxy phases were not pure phases, both had sub inclusions of the other phase leading to an Interpenetrating polymer network (IPN) type of structure. The dynamic mechanical spectroscopy data also indicated phase in phase morphology as evidenced by the shift in the Tg of the phases. It was also observed that the mechanical properties of the blends were enhanced effectively by the addition of MABS. Tensile strength and impact strength of epoxy increased by 25 % and 72% respectively up on loading of MABS. The article also provides a correlation between morphology and mechanical properties of the blend system

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Publication details

The article was received on 07 Nov 2018, accepted on 04 May 2019 and first published on 11 May 2019


Article type: Paper
DOI: 10.1039/C8NJ05653F
New J. Chem., 2019, Accepted Manuscript

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    EPOXY/METHYL METHACRYLATE ACRYLONITRILE BUTADIENE STYRENE COPOLYMER (MABS) BLENDS: REACTION INDUCED VISCOELASTIC PHASE SEPARATION, MORPHOLOGY DEVELOPMENT AND MECHANICAL PROPERTIES

    J. Joy, K. Winkler, K. Joseph, S. Anas and S. Thomas, New J. Chem., 2019, Accepted Manuscript , DOI: 10.1039/C8NJ05653F

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