(non-Newtonian) flow behavior of polymer
solutions, polymer melts,
solid-in-liquid suspensions and emulsions.
In addition to explaining
observed phenomena, the knowledge gained is
of use in modeling
operations used to process these materials.
Consequently, one can
relate process conditions to structure and
the structure to properties.
This allows one to engineer materials with
enhanced properties. Such an
approach has been employed to examine and
modify such diverse materials
as fiber-reinforced plastics, lubricants,
wall joint compounds, thermal
grease, ceramic slurries, polymer blends,
wood/plastic composites and nanocomposites.
Current work is related to
mixing and emulsification of processed
foods, the development of
drilling fluids for deep hole drilling for
oil and gas, the use of
polymers for carbon dioxide capture,
explaining the barrier properties
and understanding the flammability
properties of polymer-matrix
A.P. Shah, R.K.
and C.E. Powell, “Moisture
diffusion through vinyl ester nanocomposites
made with montmorillonite
clay,” Polym. Eng.
Sci., 42, 1852-1863
and R.K. Gupta, “An innovative extensional
viscometer for low-viscosity
and low-elasticity liquids,” Rheol. Acta, 41, 456-460
Christiansen, R.K. Gupta
Shah, “Model for anomalous moisture
diffusion through a polymer-clay nanocomposite,” J. Polym.
Phys., 41, 476-492
M. Grmela, R.K.
Gupta and V. Zmievski,
“Rheological measurements and modeling
Chapter 5 in G. Shonaike
and S.G. Advani
(Eds.), Advanced Polymeric Materials:
Structure Property Relationships, CRC Press,
Boca Raton, FL, pp.
Sridhar, “Measurement of moisture
diffusivity through layered-silicate nanocomposites,” AIChE
J., 51, 3249-3256 (2005).
and R.K. Gupta, “Recycling mixed plastics
electronics,” Proc. SPE Global Plastics
Environmental Conference, Feb
28 - March 2, 2006, Atlanta, GA
L.N. Sridhar, R.K
and M. Bhardwaj,
“Barrier properties of
45, 8282-8289 (2006).
S.-K. Yeh, A. Al-Mulla and
R. K. Gupta, “Effect of coupling agent on
the properties of PNC-based
wood/plastic composites,” J. Polym. Eng.,
E. Manias, R.K.
C.A. Wilkie, “Benzimidazolium
surfactants for modification of clayus for
use with styrenic
Degradation Stability, 92, 1753-1762
E. Manias, G.
Camino, A. Frache,
Gupta and C.A. Wilkie,
“The influence of
organically modified montmorillonites
and layered double hydroxides
on the thermal degradation and fire retardancy
of polyethylene, ethylene-vinyl acetate
copolymer and polystyrene,”
Polymer, 48, 6532-6545 (2007).
Q. Liu, D. DeKee and R.K.
Gupta, “Models of moisture
diffusion through vinyl ester/clay nanocomposites, AIChE J., 54,
dimensions and arrangement to barrier
properties of polymer nanocomposites,”
Proc. Soc. Plast.
ANTEC, May 4-7, 2008, Milwaukee, WI, pp
S.-K. Yeh and R.K. Gupta,
composites through better processing,”
Composites: Part A, 39,
“Thermal conductivity of polymer nanocomposites
made with carbon nanofibers”,
Sci., 48, 2474-2481 (2008).
“A model for
the collision efficiency of shear induced
polymer bridging”, Coll. Surfaces A: Physicochem. Eng.
Aspects, 345, 224-230 (2009).
Liang, L. Han, D. Doraiswamy and R.K. Gupta,
rheology of aramid platelet suspensions,
Polym. Eng. Sci., 51, 1933-1941
Mukhopadhyay and R.K. Gupta, Trends and
in graphene-based polymer nanocomposites,
Plastics Engineering, 67, 32-42
Song, W. Zhang, R.K. Gupta and E.G. Melby,
of operating conditions in determining
droplet size and viscosity of tackifier
emulsions formed via phase inversion, AIChE
J., 57, 96-106 (2011).
Han, D. Doraiswamy and R.K. Gupta, Jetting
dilute polymer solutions, J. Therm. Anal.
Calorim., 106, 305-312 (2011).
Liu, C.R. Youngstrom, S. Agarwal, A.
S. Gaggar and R.K. Gupta, Novel
biomass-based “Eco-FR” styrenic blends,
Polymeric Materials: Science and
Engineering, Preprints of the PMSE Division
ACS, vol 106, 87-88 (2012).
Roth, S. Agarwal and R.K. Gupta,
solid-amine sorbents for carbon dioxide
capture, Proc. 29th Annual
International Pittsburgh Coal Conference,
October 15-18, 2012, Pittsburgh, PA
(6 pages on CD).
Gupta, The use of thermosets in the building
and construction industry, in Q.
Guo (Ed.), Thermosets, Woodhead Publishing,
Cambridge, U.K., 2012, pp. 165-188).
Yeh, K.-J. Kim and R.K. Gupta, Synergistic
of coupling agents on polypropylene-based
wood-plastic composites, J. Appl.
R.K. Gupta and E. Ruckenstein,
"Stable, high solids, high thermal
conductivity pastes," U.S.
(Issued: March 24, 1992).
and S. Agarwal,
viscometer for mobile liquids
employing very small liquid volumes.”U.S.
patent No. 7,114374 issued October 3,
T.-W. Liu, R.K. Gupta, S. Agarwal and A.
Al-Mulla, Flame retardant
resinous compositions and process, U.S.
patent No. 7,939,585 B2, issued May 10,
S. Agarwal and E.A. Roth, Nanoclay-based
solid sorbents for Carbon
Dioxide capture, US Non-Provisional
(utility) patent application filed in US
Patent and Trademark Office on 11/01/2012.
Application No. 13/666,375.
Gupta, “Polymer and Composite Rheology,"
Marcel Dekker, New
York, 2000, 390
pp. ISBN #
Kumar and R.K. Gupta, "Fundamentals of
Polymer Engineering," 2nd
ed., Revised and Expanded, Marcel Dekker, New York,
2003, 693 pp. ISBN #
Gupta, E.B. Kennel and K.-J. Kim (Eds.), Polymer
Handbook, CRC Press, Boca Raton,
2010, 549 pp.ISBN
and R.K. Gupta (Eds.), Graphite, Graphene
and their Polymer Nanocomposites,
CRC Press, Boca Raton, FL, 2013, 609
pages, ISBN #978-1-4398-2779-6.