 |
Guy C. Berry University
Professor Ph.D., Universityof Michigan |
TEL: 412-268-3131 FAX: 412-268-6897 e-mail: gcberry@andrew.cmu.edu |
|
Guy C. Berry University
Professor Ph.D., Universityof Michigan |
TEL: 412-268-3131 FAX: 412-268-6897 e-mail: gcberry@andrew.cmu.edu |
Please Note: Professor Berry is not accepting graduate students or post-doctoral associates at this time.
Research Interests:
Dilute Solutions of Flexible and Semiflexible Polymers
Moderately Concentrated Solutions of Flexible Polymers
Nematic Solutions of Semiflexible Polymers
Studies in these topics center around the use of static and dynamic light scattering and rheological measurements to elucidate issues of the conformation and dynamics of macromolecules and their interactions in solution. Physical chemical measurements include photon correlation and integrated intensity light scattering, size exclusion chromatography and fluorescence spectroscopy. The light scattering studies involve the use of lasers and a computer-based aurocorrelation and data acquisition system. Five different rheometers are available for the rheological studies. These are designed to permit studies over a wide range of temperature and response time. The measurements include the creep and recoverable compliances over a wide range of time, temperature and stress, the flow birefringence, and the response to a deformation sinusoidally periodic in time. The results are compared with molecular or continuum mechanical models where possible.
Dilute Solutions: Static and dynamic light scattering and viscometry are used to characterize the intramolecular conformation and intermolecular interactions. Examples have included rodlike polyelectrolytes, branched and linear flexible chain polymers, as well as polymers that tend to associate in solution. The latter often involve metastable association that persists even in dilute solution as a precursor to intermolecular structure that will have a substantial role in the properties of the polymer in the undiluted state.
| Moderately Concentrated Solutions: The
viscoelastic properties of moderately concentrated
solutions of flexible chain polymers have been studied by
rheological measurements as well as by dynamic light
scattering methods. Examples have included systems
that can form a gel under appropriate conditions, and
this area is a subject of some current
investigations. Model systems have been
devised that will permit control of the gel structural
features, to elucidate the effect of these on the
viscoelastic properties of the system. Nematogenic polymer solutions: Recent studies have involved the evolution of texture and the disappearance of loop defects as a nematic solutions of a rodlike polymer anneal to a defect-free texture--interaction of the loop defects with external magnetic fields has also been studied. Rheological and rheo-optical studies on solutions in shear deformation of the same systems reveal the evolution of the texture with increasing time at a given stress, and as a function of the stress. The systems studied (including KevlarTM solutions) do not align at low deformation rates, but may approach alignment at higher rates. |
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Selected
Recent Publications
Dilute Solutions
of Flexible and Semiflexible Polymers
"The hydrodynamic and conformational properties of denatured proteins in dilute solutions", Berry GC, Protein Science 2010, 19(1):94-98.
"Total Intensity Light Scattering from Solutions Macromolecules", Berry Guy C, In: Soft-Matter Characterization. Edited by Borsali RP, Robert, vol. 1. New York: Springer; 2008: 41-132.
"Peterlin and the characterization of particles and polymers in dilute solution,", Berry, G. C. In: Festschrift: Anton Peterlin 1908-199. Edited by Tanja Peterlin-Neumaier. Ljubljana, Slovenia: Slovene Academy of Sciences, ; 2008."An Approximation for the Intrinsic Viscosity of Brush-Shaped Polymers", Berry GC, International Journal of Polymer Analysis and Characterization 2007, 12(4):273-284.
"Reversible Association of PNA-Terminated Poly(2-hydroxyethyl acrylate) from ATRP", Wang Y; Armitage BA; Berry GC, Macromolecules 2005, 38(14):5846-5848.
"Light scattering, classical: Size and size distribution", G. C. Berry, In Encyclopedia of Analytical Chemistry R. A. Meyers, ed.; John Wiley & Sons Ltd.: Sussix, UK, 2000.
"Conformational properties of poly(ether sulfone) and poly(ether ketone)", Guy C. Berry, Macromolecules 32, 7939-41 (1999).
"Static and dynamic light scattering", G. C. Berry; P. M. Cotts, In Experimental methods in polymer characterization R. A. Pethrick; R. S. Stein, eds.; John Wiley & Sons Ltd.: Sussix, UK, 1999.
"Intermolecular
association and supramolecular organization in dilute solution.
1. Regioregular poly(3-dodecylthiophene)", S. Yue; G. C.
Berry; R. D. McCullough, Macromolecules 29(3), 933-9 (1996).
"Intermolecular
association and supramolecular organization in dilute solution.
2. Light scattering and optical activity of
poly(p-biphenylmethyl-L-glutamate", S. Yue; G. C. Berry; M.
S. Green, Macromolecules 29, 6175-82 (1996).
"Reflections and Comments
on "Molecular Configuration and Thermodynamic Properties
from Intrinsic Viscosities" by Paul J. Flory and Thomas G
Fox", E. F. Casassa; G. C. Berry, J. Polym. Sci., Pt. B:
Polym. Phys. 34, 203-6 (1996).
"Light Scattering Studies
on Dilute Solutions of Semiflexible Polyelectrolytes", V. J.
Sullivan; G. C. Berry, Intl. J. Polym Analysis and
Characterization 2, 55-69 (1995).
Moderately
Concentrated Solutions of Flexible Polymers
"Moderately concentrated solutions and gels of atactic polystyrene in solvent mixtures of carbon disulfide and tricresyl phosphate", Bui HS; Berry GC, Journal of Rheology 2007, 51(5):915-945.
"Crossover behavior in the
viscosity of semiflexible polymers: Solutions of sodium
hyaluronate as a function of concentration, molecular weight and
temperature", M. Milas; I. Roure; G. C. Berry, J. Rheol. 40,
1155-66 (1996).
"Crossover behavior in the
viscosity of semiflexible polymers: Intermolecular interactions
as a function of concentration and molecular weight", G. C.
Berry, J. Rheol. 40, 1129-54 (1996).
"Moderately concentrated
Solutions of Polystyrene. Part 6. Gel Formation in Carbon
Disulfide", S. J. Chen; G. C. Berry; D. J. Plazek,
Macromolecules 28, 6539-50 (1995).
"Moderately concentrated
Solutions of Polystyrene. Part 5. Static and Dynamic Light
Scattering in bis(2-ethylhexyl) phthalate", S. Yue; G. C.
Berry, Macromolecular Symp. 98, 1005-27 (1995).
"Static and Dynamic Light
Scattering on Moderately Concentrated Solutions: Isotropic
Solutions of Flexible and Rodlike Chains and Nematic Solutions of
Rodlike Chains", G. C. Berry, Adv. Polym. Sci. 114, 233-90
(1994).
Nematic Solutions
of Semiflexible Polymers
"Studies on the texture of
nematic solutions of rodlike polymers. 2. Development and
relaxation of loop dislcinations", Zhanjie Tan; Beibei Diao;
Guy C. Berry, Macromolecules 32, 7172-82 (1999).
"Studies on the Texture of
Nematic Solutions of a Rodlike Polymer. 1. Distortion of the
Director Field in a Magnetic Field", B. Diao; G. C. Berry,
Liquid Crystals in press (1996).
"The Effects of Surface Layers on the Nonlinear Optical Properties of Solutions of a Nematogenic Polymer", H. Mattoussi; G. C. Berry; G. D. Patterson, J. Polym. Sci.: Pt B: Polym. Phys. 34, 925-38 (1996).
Other Topics
"Viscoelastic and dielectric studies on comb- and brush-shaped poly(n-butyl acrylate)", Berry GC; Kahle S; Ohno S; Matyjaszewski K; Pakula T, Polymer 2008, 49(16):3533-3540.
"Molecular brushes as super-soft elastomers", Pakula T; Zhang Y; Matyjaszewski K; Lee H-i; Boerner H; Qin S; Berry GC, Polymer 2006, 47(20):7198-7206.
"Polymer rheology: Principles, Techniques and Applications", G. C. Berry, In Desk Reference of Polymer Characterization and Analysis; J. R. F. Brady, ed.; American Chemical Society: New York, 2003: 574-623.
"On the use of
stretched-exponential functions for both linear viscoelastic
creep and stress relaxation", G. C. Berry and D. J. Plazek,
Rheologica Acta, 36, 320-9 (1997).
Publications:
Publications:
1990 to present
Publications:
1958-1989
Preprints:
The hydrodynamic and conformational properties of denatured proteins in dilute solutions
Viscoelastic and dielectric studies on comb- and brush-shaped poly(n-butyl acrylate)
Studies on the texture of nematic
solutions of rodlike polymers. 3. Rheo-optical and rheological
behavior in solution
Encyclopedia chapter on
molecular weight distribution
Light Scatter Chapters:
2015-Encyclopedia chapter on static
light scattering (1999 update)
2014-Book chapter on static and dynamic light
scattering
1999-Encyclopedia chapter on static
light scattering
1998-Book chapter on static and dynamic
light scattering
1994-Scattering on concentrated solutions
1987-Encyclopedia chapter on static and dynamic
light scattering
1975-Book chapter on static light
scattering
Rheology Chapters:
Book chapter on rheology
Rheology Lecture
Selected Lecture Notes:
Light scattering from dilute macromolecular solutions and particle suspensions,
ONRL-2015; 01 Sep 2015
Developments
and trends in light scattering from macromolecular solutions,
ISPAC-2005; 20-23 Jun 2005
The dependence of
semiflexible chains on the viscosity on concentration and
molecular weight,
Telluride Conference, August 2001
Remarks on bare parameters in models
for polymer behavior; 4th Intl Disc Meeting on Relax Complex
Syst; Crete, June 2001
Texture Development in
Nematic Polymeric Liquid Crystalline Fluids; Keynote Lecture,
Japan Soc Mat Sci, Osaka Japan, June 2001
Polymer
Characterization: Past, Present and Future; 14th Intl. Symp.
Polymer Characterization and Analysis, Nagoya Japan, June 2001
Crossover behavior in the dependence
of the viscosity on concentration and molecular weight;
ChiPol-2000, Santiago, Chile, Dec 2000
Linear Viscoelasticity: Some Essential
Features; CPS Workshop, Jan 1999
Birefringence in Stress-Controlled
Linear Viscoelasticity; Meeting Soc. Rheology, Nov 1999
Texture Development in Nematic
Polymeric Liquid Crystalline Fluids; Distinguished Lecture, Inst.
Materials Science, Univ. Connecticut, Nov 1999
Characterization of
Branched Chain Polymers; North Carolina Section, ACS, Sep 1998
Other Info:
G. C. Berry Curriculum Vitae
MathCad file to implement calculations
with the wormlike and helical-wormlike chain models
Announcement: GCB appointment as a
University Professor
Announcement: GCB PMSE
Div. of ACS award as PMSE Fellow
Announcement: GC
Bingham Medal of Soc. Rheology
The Home Page for the
Department of Chemistry