Phase miscibility and dynamic heterogeneity in PMMA/SAN blends through solvent free reactive grafting of SAN on graphene oxide

Physical Chemistry Chemical Physics : PCCP
Tanyaradzwa S MuzataSuryasarathi Bose

Abstract

The spatial distribution of nanoparticles in a particular host polymer matrix can be improved by using brush coated nanoparticles. In this work we have grafted styrene-acrylonitrile (SAN) onto the surface of graphene oxide (GO) and investigated as to how the demixing temperature, morphology and volume cooperativity of PMMA/SAN blends are influenced. Grafting of polymer chains on the surface of nanoparticles usually involves the use of large amounts of solvents, many which are detrimental to the environment besides involving cumbersome processes. SAN-g-GO was prepared by a robust solvent-free strategy wherein the cyano group in SAN was replaced by oxazoline groups during melt mixing in the presence of zinc acetate and ethanol amine. These newly created oxazoline groups reacted with the COOH group of GO under melt extrusion resulting in grafting of SAN on the surface of GO sheets. The effect of SAN-g-GO nanoparticles on the demixing, local segmental motions and morphology evolution for different annealing times was carefully investigated in a classical LCST system, PMMA/SAN blend, using melt rheology, modulated DSC and AFM, respectively. The changes in viscoelastic behavior in the vicinity of demixing are investigated systematica...Continue Reading

References

Mar 24, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Samanvaya SrivastavaLynden A Archer
Sep 2, 2014·Physical Chemistry Chemical Physics : PCCP·Priti XavierSuryasarathi Bose
Oct 4, 2014·Physical Chemistry Chemical Physics : PCCP·Goutam Prasanna KarSuryasarathi Bose
May 20, 2015·Physical Chemistry Chemical Physics : PCCP·Shital Patangrao Pawar, Suryasarathi Bose
Feb 24, 2017·Proceedings of the National Academy of Sciences of the United States of America·Ren ZhangAlamgir Karim

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Citations

Sep 24, 2020·Physical Chemistry Chemical Physics : PCCP·Tanyaradzwa S MuzataSuryasarathi Bose

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Methods Mentioned

BETA
rheology
AFM
NMR
differential scanning calorimetry

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