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

DEFINITIONS

NANOPARTICLES 1 Nanometer (nm) = 10 -9 Meter Particles whose dimensions are of the order of ‘nm’

GLASS TRANSITION TEMPERATURE (Tg)

MY FIELD OF RESEARCH

PROBING THE GLASS TRANSITION TEMPERATURE OF A POLYMER BY EMBEDDING METAL NANOPARTICLES

IMPORTANT THINGS INVOLVED

POLYMER NANOPARTICLE RAMAN SPECTROSCOPY

NANOPARTICLES

GOLD NANOPARTICLES (Au)

POLYMER USED

THIN FILM OF POLYSTYRENE

PREPARED BY SPIN COATING

RAMAN SPECTROSCOPY

THE RAMAN SPECTROMETER

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

CONCLUSION

NANOPARTICLES HELPS IN FINDING THE GLASS TRANSITION TEMPERATURE OF POLYSTYRENE.

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.

ANY QUESTIONS PLEASE ?

THANK YOU VERY MUCH….

RATAN KISHORE PUTLA.