Grigori (Grisha) A. Medvedev

U.S. citizen.

SM,Statistical Physics,Leningrad State University, Russia, 1987
PhD (*),Polymer Physics, Institute of High-Molecular Compounds, Russian Academy of Sciences, 1991

Research Associate,Purdue University, School of Chemical Engineering, 1999-present
Post-Doctoral Research Fellow, Purdue University, School of Chemical Engineering, 1995-1998
Post-Doctoral Research Fellow,Institute of Fundamental Technological Research, Polish Academy of Sciences, 1993-1994
Junior Research Fellow,Institute of High-Molecular Compounds, Russian Academy of Sciences, 1991-1993

(i) Mechanics of glassy polymers; constitutive modeling
(ii) Mechanics of unfilled and filled elastomers
(iii) Kinetics of single-site polymerization
(iv) Liquid crystalline polymers

2015

1. G.A. Medvedev and J.M. Caruthers, “On Thermodynamic Consistency of a Stochastic Constitutive Model for Glassy Polymers”.-Industrial & Engineering Chemistry Research, 54(42), 10472–10480 (2015). ref
2. G.A. Medvedev and J.M. Caruthers, “Stochastic model prediction of nonlinear creep in glassy polymers”.-Polymer, 74, 235-253 (2015). ref
3. G.A. Medvedev and J.M. Caruthers, “Predictions of Volume Relaxation in Glass Forming Materials Using a Stochastic Constitutive Model”.-Macromolecules, 48(3), 788-800 (2015). ref

   2014

4. J.W. Kim, G.A. Medvedev, and J.M. Caruthers, “Mobility Evolution during Tri-axial Deformation of a Glassy Polymer”.-Polymer, 55(6), 1570-1573 (2014). ref

   2013

5. G.A. Medvedev, J.W. Kim, and J.M. Caruthers, “Prediction of the relationship between the rate of deformation and the rate of stress relaxation in glassy polymers”.-Polymer, 54(24), 6599-6607 (2013). ref
6. J.W. Kim, G.A. Medvedev, and J.M. Caruthers, “The Response of a Glassy Polymer in a Loading/Unloading Deformation: The Stress Memory Experiment”. -Polymer, 54(21), 5993-6002 (2013). ref
7. J.W. Kim, G.A. Medvedev, and J.M. Caruthers, “Nonlinear Stress Relaxation in an Epoxy Glass and Its Relationship to Deformation Induced Mobility”. -Polymer, 54(15), 3949-3960 (2013). ref
8. J.W. Kim, G.A. Medvedev, and J.M. Caruthers, “Observation of Yield in Triaxial Deformation of Glassy Polymers”.-Polymer, 54(11), 2821-2833 (2013). ref
9. G.A. Medvedev and J.M. Caruthers, “Development of a Stochastic Constitutive Model for Prediction of Post-Yield Softening in Glassy Polymers”. -Journal of Rheology, 57(3), 949-1002 (2013). ref

   2012

10. G.A. Medvedev, A.B. Starry, D. Ramkrishna, and J.M. Caruthers, “Stochastic Model for Volume Relaxation in Glass Forming Materials: Local Specific Volume Model”.-Macromolecules, 45(17), 7237-7259 (2012). ref
11. C.Y. Li, G.A. Medvedev, E.W. Lee, J.W. Kim, J.M. Caruthers, and A. Strachan, "Molecular dynamics simulations and experimental studies of the thermomechanical response of an epoxy thermoset polymer".-Polymer, 53(19), 4222-4230 (2012). ref

    prior to 2012

12. E.W. Lee, G.A. Medvedev, and J.M. Caruthers, “Deformation Induced Evolution of Mobility in PMMA”.-J. Polymer Sci. Part B: Polymer Physics, 48(22), 2399-2401 (2010).ref
13. H.N. Lee, K. Paeng, S.F. Swallen, M.D. Ediger, R.A. Stamm, G.A. Medvedev, and J.M. Caruthers, “Molecular Mobility of Poly(methyl methacrylate) Glass During Uniaxial Tensile Creep Deformation”.-J. Polymer Sci. Part B: Polymer Physics, 47(17), 1713-1727 (2009). ref

2013

1. R. Prabhu, R. Klitkou, G.A. Medvedev, and J.M. Caruthers, "A critical analysis of the effect of crosslinking on the linear viscoelastic behavior of styrenebutadiene rubber and other elastomers".-J. Polymer Sci. Part B: Polymer Physics, 51(8), 687-697 (2013). ref
2. O. Ogebule, G.A. Medvedev, and J.M. Caruthers, “Necking in fumed silica filled poly(dimethylsiloxane) and the resulting mechanical properties of the necked material”.-Polymer, 54(3), 1190-1196 (2013). ref

   prior to 2012

3. A. Bhattacharya, G.A. Medvedev, and J.M. Caruthers, “Time-Dependent Mechanical Behavior of Carbon Black Filled Elastomers”.- Rubber Chemistry and Technology, 84(3), 296-324 (2011).ref

2016

1. P.D. Pletcher, J.M. Switzer, D.K. Steelman, G.A. Medvedev, W.N. Delgass, J.M. Caruthers, and M.M. Abu-Omar, "Quantitative Comparative Kinetics of 1-Hexene Polymerization across Group IV Bis-Phenolate Catalysts".-ACS Catal., 6(8), 5138–5145 (2016). ref

   2014

2. D.K. Steelman, S. Xiong, G.A. Medvedev, W.N. Delgass, J.M. Caruthers, and M.M. Abu-Omar, "Effects of Electronic Perturbations on 1-Hexene Polymerization Catalyzed by Zirconium Amine Bisphenolate Complexes".-ACS Catal., 4(7), 12186-12190 (2014). ref
3. H.A. Brown, S. Xiong, G.A. Medvedev, Y.A. Chang, M.M. Abu-Omar, J.M. Caruthers, and R.M. Waymouth "Zwitterionic Ring-Opening Polymerization: Models for Kinetics of Cyclic Poly(caprolactone) Synthesis".-Macromolecules, 47(9), 2955-2963 (2014). ref
4. S. Xiong, D.K. Steelman, G.A. Medvedev, W.N. Delgass, M.M. Abu-Omar, and J.M. Caruthers, "Selective Degenerative Benzyl Group Transfer in Olefin Polymerization".-ACS Catal., 4(4), 1162-1170 (2014). ref
5. S.D. Hicks, D. Kim, S. Xiong, G.A. Medvedev, J.M. Caruthers, S. Hong, W. Nam, and M.M. Abu-Omar, "Non-Heme Manganese Catalysts for On-Demand Production of Chlorine Dioxide in Water and Under Mild Conditions".-J. Am. Chem. Soc., 136(9), 3680-3686 (2014). ref

   2013

6. D.K. Steelman, S. Xiong, P.D. Pletcher, E. Smith, J.M. Switzer, G.A. Medvedev, W.N. Delgass, J.M. Caruthers, and M.M. Abu-Omar, "Effects of Pendant Ligand Binding Affinity on Chain Transfer for 1-Hexene Polymerization Catalyzed by Single-Site Zirconium Amine Bis-Phenolate Complexes".-J. Am. Chem. Soc., 135(16), 6280-6288 (2013). ref

   2012

7. J.M. Switzer, N.E. Travia, D.K. Steelman, G.A. Medvedev, K.T. Thomson, W.N. Delgass, M.M. Abu-Omar, and J.M. Caruthers, “Kinetic Modeling of 1-Hexene Polymerization Catalyzed by Zr(tBu-(ONO)-O-NNMe2)Bn-2/B(C6F5)(3)”.-Macromolecules, 45(12), 4978-4988 (2012). ref

   prior to 2012

8. K.A. Novstrup, N.E. Travia, G.A. Medvedev, C. Stanciu, J.M. Switzer, K.T. Thomson, W.N. Delgass, M.M. Abu-Omar, and J.M. Caruthers, “Mechanistic Detail Revealed via Comprehensive Kinetic Modeling of [rac-C2H4(1-indenyl)2ZrMe2]-Catalyzed 1-Hexene Polymerization”. -J. Am. Chem. Soc., 132(2), 558-566 (2010).ref
9. T.A. Manz, S. Sharma, K. Phomphrai, K.A. Novstrup, A.E. Fenwik, P.E. Fanwik, G.A. Medvedev, M.M. Abu-Omar, W.N. Delgass, K.T. Thomson, and J.M. Caruthers, "Quantitative Effects of Ion Pairing and Sterics on Chain Propagation Kinetics for 1-Hexene Polymerization Catalyzed by Mixed Cp '/ArO Complexes".-Organometallics, 27(21), 5504-5520 (2008). ref
10. T.A. Manz, K. Phomphrai, G. Medvedev, B.B. Krishnamurthy, S. Sharma, J. Haq, K.A. Novstrup, K.T. Thomson, W.N. Delgass, J.M. Caruthers and M.M. Abu-Omar, "Structure-activity correlation in titanium single-site olefin polymerization catalysts containing mixed cyclopentadienyl/aryloxide ligation".-J. Am. Chem. Soc., 129(13), 3776 (2007).ref

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1. Y.Y. Gotlib, G.A. Medvedev, and S.V. Lyulin, "Dependence of the temperature of nematic phase appearance in polymer liquid crystals on the chain rigidity".-Vysokomolekulyarnye Soedineniya Seriya A & Seriya B, 39(2), 493-499 (1997).
2. G.A.Medvedev, Y.Y.Gotlib, "Lattice model of heterogeneous polymer chain in the liquid crystalline state. I. Statistical properties".-Macromol. Theor. Simul., 3(1), 121-134 (1994). ref
3. Y.Y.Gotlib, G.A.Medvedev, "Lattice model of heterogeneous polymer chain in the liquid crystalline state. II. Local relaxation properties".-Macromol. Theor. Simul. 3(1), 135-149 (1994). ref
4. Y.Y.Gotlib, G.A.Medvedev, S.V.Fridrikh "Dynamic model of heterogeneous freely jointed polymer chains in liguid crystalline state".-Polym. Sci. USSR(Engl. Trans.) 1992 A34(6),531.
5. G.A.Medvedev, Y.Y.Gotlib "Nematic liguid crystalline ordering in a lattice model of chain macromolecules ".-Polym. Sci. USSR(Engl. Trans.) 1991 A33(4),636.
6. Y.Y.Gotlib, G.A.Medvedev "Conformational properties of the lattice model of a polymer chain in the orienting field of the quadrupole symmetry".-Polym. Sci. USSR(Engl. Trans.) 1990 A32(11),2328.
7. A.A.Merkurieva, G.A.Medvedev, T.M.Birshten, Y.Y.Gotlib "Theory of the transition of two- dimensional systems into the orientationally ordered state".-Polym. Sci. USSR(Engl. Trans.) 1990 A32(5),896.
8. Y.Y.Gotlib, G.A.Medvedev, E.A.Karpov "Statistical properties of a model chain consisting of quasielastic elements with fixed average length in the presence of external or self-consistent liqui crystalline field (of the Maier-Saupe type)".-Polym. Sci. USSR(Engl. Trans.) 1989 A31(6),1242.
9. Y.Y.Gotlib, E.A.Karpov, G.A.Medvedev "Multisegment dynamic model of a polymer chain at high strain rate gradients in an elongational flow. Local and global orientation properties".-Polym. Sci. USSR(Engl. Trans.) 1989 A31(5),1146.

Although as a research scientist I do not have formal teaching responsibilities, I have been actively involved with guiding the graduate students:(over last 5 years) Shay Ogebule (PhD, Oct, 2013, Intel); Sang Ha Son; Jeffrey Switzer; Silei Xiong; Jaewoo Kim, (PhD, Aug. 2013, post-doctoral fellow, Cornell); Rasika Prabhu (PhD, Aug, 2012, Schlumberger); Eunwoog Lee (PhD, Aug, 2011, LG, Korea); Krista Novstrup, (PhD, May 2009, ExxonMobil).

Collaborators:
J.M.Caruthers (Purdue, ChE),caruther@ecn.purdue.edu
W.N.Delgass (Purdue, ChE),delgass@purdue.edu
M. Abu-Omar (Purdue, Chemistry),mabuomar@purdue.edu
M.D. Ediger (Univ. Wisconsin),ediger@chem.wisc.edu
R.M. Waymouth (Stanford),waymouth@stanford.edu