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X-ray micro computed tomography, segmental relaxation and crystallization kinetics in interfacial stabilized co-continuous immiscible PVDF/ABS blends

Kar, Goutam Prasanna and Biswas, Sourav and Bose, Suryasarathi (2016) X-ray micro computed tomography, segmental relaxation and crystallization kinetics in interfacial stabilized co-continuous immiscible PVDF/ABS blends. In: POLYMER, 101 . pp. 291-304.

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Official URL: http://dx.doi.org/10.1016/j.polymer.2016.08.071

Abstract

A model immiscible blend system (PVDF/ABS, 50/50 wt/wt) was studied here and an attempt was made to stabilize the co-continuous structures using either a mutually soluble homopolymer (PMMA) or by introducing particles like graphene oxide sheets (GO) which preferentially localizes in PVDF or a combination of both i.e. PMMA wrapped GO, synthesized by in situ polymerization of MMA in presence of GO sheets (PMMA-GO). The improvement in structural properties couldn't be realized with GO alone or when added along with PMMA separately however, with PMMA-GO significant improvement in structural properties was realized. The coarsening of co-continuous microstructure during annealing was monitored here using both scanning electron microscopy and micro tomography. 2D SEM micrographs and the X-ray tomography reveal that the PVDF/ABS blends containing only PMMA coarsened upon annealing however, in presence of PMMA-GO although the phase dimension of the initial morphology was larger than the blends with only PMMA but the coarsening was suppressed as observed from micro CT scans. The crystallization kinetics using modified Avrami model was assessed through non-isothermal DSC measurements to study the effect of PMMA, GO and PMMA-GO on the crystallization behaviour of the blends. Taken together, our results uncover an important observation wherein PMMA-GO effectively compatibilizes and stabilizes the morphology against post-processing operations like annealing in PVDF/ABS blends and also significantly improves the structural properties. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 03 Dec 2016 06:06
Last Modified: 03 Dec 2016 06:06
URI: http://eprints.iisc.ac.in/id/eprint/55247

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