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Dr.
Gupta's
research
is
directed
mainly
at understanding the
(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
of graphene-based nanocomposites
and understanding the flammability properties of polymer-matrix
composites.
Selected Publications
A.P. Shah, R.K. Gupta,
H.V.S. GangaRao and C.E. Powell, “Moisture
diffusion through vinyl ester nanocomposites
made with montmorillonite clay,” Polym. Eng. Sci., 42, 1852-1863
(2002).
S. Agarwal
and R.K. Gupta, “An innovative extensional viscometer for low-viscosity
and low-elasticity liquids,” Rheol. Acta, 41, 456-460 (2002).
A.D. Drozdov,
J.
deC. Christiansen, R.K. Gupta
and A.P.
Shah, “Model for anomalous moisture diffusion through a polymer-clay nanocomposite,” J. Polym.
Sci.:
Part
B:
Polym. Phys., 41, 476-492
(2003).
A. Ait-Kadi,
M.
Grmela, R.K. Gupta and V. Zmievski, “Rheological measurements and modeling
of noncolloidal particulate suspensions,”
Chapter 5 in G. Shonaike and S.G. Advani (Eds.), Advanced Polymeric Materials:
Structure Property Relationships, CRC Press, Boca Raton, FL, pp.
181-208 (2003).
H.T. Rana,
R.K.
Gupta,
H.V.S.
GangaRao and L.N.
Sridhar, “Measurement of moisture diffusivity through layered-silicate nanocomposites,” AIChE
J., 51, 3249-3256 (2005).
A. Al-Mulla
and R.K. Gupta, “Recycling mixed plastics from end-of-life
electronics,” Proc. SPE Global Plastics Environmental Conference, Feb
28 - March 2, 2006, Atlanta,
GA (Paper E2
on CD).
L.N. Sridhar, R.K Gupta
and M. Bhardwaj, “Barrier properties of
polymer nanocomposites,” I&EC Res.,
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.,
26,
783-804
(2006).
M.C. Costache,
M.J.
Heidecker, E. Manias, R.K.
Gupta and
C.A. Wilkie, “Benzimidazolium
surfactants for modification of clayus for
use with styrenic polymers,” Polym. Degradation Stability, 92, 1753-1762
(2007).
M.C. Costache,
M.J.
Heidecker, E. Manias, G.
Camino, A. Frache, G. Beyer,
R.K.
Gupta and C.A. Wilkie, “The influence of
carbon nanotubes, 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, 364-371 (2008).
D. Song, W. Zhang, E.G. Melby and R.K. Gupta, “An instrumented mixer
setup for making tackifier dispersions
used to make pressure-sensitive adhesives,” Meas. Sci. Technol., 19,
045801/1-045801/9 (2008).
D.L. Statler,
Jr.
and
R.K.
Gupta,
“Relating
nanoclay
dimensions and arrangement to barrier properties of polymer nanocomposites,” Proc. Soc. Plast.
Eng.
ANTEC, May 4-7, 2008, Milwaukee,
WI, pp 163-167.
S.-K. Yeh and R.K. Gupta, “Improved wood-plastic
composites through better processing,” Composites: Part A, 39,
1694-1698 (2008).
D.L. Statler,
Jr.
and
R.K.
Gupta,
“A
finite element analysis of the modeling of heat
release rate, as assessed by a Cone Calorimeter, on barrier properties
of char forming polycarbonate,” Proc. COMSOL Conference, October 9-11,
2008, Boston, MA.
S. Agarwal,
M.M.K.
Khan
and
R.K.
Gupta,
“Thermal conductivity of polymer nanocomposites
made with carbon nanofibers”, Polym. Eng.
Sci., 48, 2474-2481 (2008).
S. Agarwal,
R.K.
Gupta
and
D.
Doraiswamy, “A model for
the collision efficiency of shear induced agglomeration involving
polymer bridging”, Coll. Surfaces A: Physicochem.
Eng.
Aspects, 345, 224-230 (2009).
D. Song, R.K. Gupta and
R.P. Chhabra, “Effects of blockage on heat
transfer from a sphere in power-law fluids”, Ind. Eng. Chem. Res., 49,
3849-3861 (2010).
S.-K. Yeh and R.K. Gupta, “Nanoclay-reinforced,
polypropylene-based wood-plastic
composites,” Polym. Eng. Sci., 50, 2013-2020 (2010).
Patents
S.
Iruvanti, R.K. Gupta and E. Ruckenstein, "Stable, high solids, high thermal
conductivity pastes," U.S. Patent 5,098,609
(Issued: March 24, 1992).
R.K.
Gupta
and
S. Agarwal,
“A
sensitive,
spin-line
type
extensional
viscometer for mobile liquids
employing very small liquid volumes.” U.S.
patent No. 7,114374 issued October 3, 2006.
S.K.
Gaggar, R.K. Gupta, T.-W. Liu,
S. Agarwal and A. Al-Mulla,
Flame
retardant
resinous
compositions
and
process, Application, serial
number 12/022420, filed with U.S. Patent office on January 30, 2008.
Books
R.K.
Gupta, “Polymer and Composite Rheology,"
2nd
ed.,
Revised
and
Expanded,
Marcel Dekker, New
York, 2000, 390 pp. ISBN #
0-8247-9922-4
A.
Kumar and R.K. Gupta, "Fundamentals of Polymer Engineering," 2nd
ed., Revised and Expanded, Marcel Dekker, New York, 2003, 693 pp. ISBN #
0-8247-0867-9.
R.K.
Gupta, E.B. Kennel and K.-J. Kim (Eds.), Polymer Nanocomposites Handbook, CRC Press, Boca Raton, FL, 2010, 549 pp.
ISBN
#978-0-8493-9777-6.
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