nanoparticles their application in probing glass transition temperature of polymers
DESCRIPTION
NANOPARTICLES Their application in probing Glass Transition Temperature of Polymers. By RATAN KISHORE PUTLA Mechanical & Aerospace Engineering Oklahoma State University. QUICK OVERVIEW. FEW DEFINITIONS MY RESEARCH CONCLUSION. - PowerPoint PPT PresentationTRANSCRIPT
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NANOPARTICLES
Their application in probing Glass Transition Temperature of Polymers.
By
RATAN KISHORE PUTLA Mechanical & Aerospace Engineering Oklahoma State University
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QUICK OVERVIEW
FEW DEFINITIONS
MY RESEARCH
CONCLUSION
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DEFINITIONS
NANOPARTICLES 1 Nanometer (nm) = 10 -9 Meter Particles whose dimensions are of the order of ‘nm’
GLASS TRANSITION TEMPERATURE (Tg)
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MY FIELD OF RESEARCH
PROBING THE GLASS TRANSITION TEMPERATURE OF A POLYMER BY EMBEDDING METAL NANOPARTICLES
IMPORTANT THINGS INVOLVED
POLYMER NANOPARTICLE RAMAN SPECTROSCOPY
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NANOPARTICLES
GOLD NANOPARTICLES (Au)
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POLYMER USED
THIN FILM OF POLYSTYRENE
PREPARED BY SPIN COATING
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RAMAN SPECTROSCOPY
THE RAMAN SPECTROMETER
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CALCULATION OF “Tg” Intensity Vs Wave number Peak shift
Peak values Vs Temperature
20 40 60 80 100 120
-80
-60
-40
-20
0
20
40
60
80
Tg = 82oC ?
Adrich's value: 100 oC, Mw: ~280,000 by GPC
Phas
e Sh
ift (
o )
Tip Temperature (oC)
Polystyrene film:spin-coated @ 2000 RPM
for 120 sec. and then vaccumn dried at 100oC overnight B
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CONCLUSION
NANOPARTICLES HELPS IN FINDING THE GLASS TRANSITION TEMPERATURE OF POLYSTYRENE.
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REFERENCES
Macromolecules - V.Zaporojtchenko et al. Direct Imaging of Nanoparticle Embedding to probe viscoelasticity of
polymer surfaces – J.H.Teichroeb et al. Investigation of Surface Glass Transition Temperature by embedding
of Noble Metal Nanoclusters into Monodisperse Polystyrenes – Jorn Erichsen et al.
Nanosphere Embedding into Polymer Surfaces : A Viscoelastic Contact Mechanics Analysis – Hutcheson et al.
Tuinstra, F. & Koenig, J. L. 1970. Raman Spectrum of Graphite. Journal of Chemical Physics 53(3), 1126-1130.
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ANY QUESTIONS PLEASE ?
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THANK YOU VERY MUCH….
RATAN KISHORE PUTLA.