Guy C.

Berry

University Professor
Emeritus

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.


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).


LINKS

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:
Book chapter on static light scattering
Encyclopedia chapter on static light scattering
Book chapter on static and dynamic light scattering
Rheology Chapters:
Book chapter on rheology
Rheology Lecture

Selected Lecture Notes:
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


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