Carin A. Helfer

• Appointments in Prof. Mattice's group:
  • Graduate student, 1989-1993.
  • Postdoc, part time, 1997-2003.
  • Postdoc, full time, 2003-2004
  • Sr. Postdoc. Res. Assoc., 2004-present.
• Ph. D. Dissertation: "Conformational Analysis of Profisetinidins", 1993.
• Current position: Postdoc, University of Akron, carin@polymer.uakron.edu
• Topics of research with Prof. Mattice: Condensed Tannins. Crystalline polyesters. Liquid Crystals

Publications coauthored with Prof. Mattice

• Helfer CA, Mattice WL "The rotational isomeric state model" in Physical Properties of Polymer Handbook, Mark JE, Ed., 2nd edition, Springer, accepted November 13, 2004
• Mattice WL, Helfer CA "Average density of chain atoms at positions along the contour of freely jointed chains" Polymer 2005, 46, 7473-7477
• Mattice WL, Helfer CA, Rane SS, von Meerwall ED, Farmer BF "Some mechanisms for subtle influences of stereochemical composition on the physical properties of macromolecules" J Polym Sci: Part B: Polym Phys 2005, 43, 1271-1282
• Helfer CA, Mattice WL "Conformational origin of the molecular weight dependence of the characteristic ratio of the dipole moment in poly(A-B)" Polymer 2005, 46, 4361-4367
• Helfer CA, Chen D, Mattice WL, Farmer BL "Conformations produced by interaction of the side chains in the poly(silylenemethylene) with repeating sequence [Si(CH₃)R-CH₂]_x, R = O(CH₂)₃OC₆H₄C₆H₅" J Polym Sci: Part B: Polym Phys 2005, 43, 886-896
• Mattice WL, Helfer CA "Conformational end effects in unperturbed chains and star-branched polymers" Polymer 2005, 46, 2389-2394
• Mattice WL, Helfer CA, Sokolov AP "The persistence length and the finite chain length effect on characteristic ratios" Macromolecules 2004, 37, 4711-4717
• Xu G, Rane SS, Helfer CA, Mattice WL, Pugh C "Monte Carlo simulation of solvent effects on the threading of poly(ethylene oxide)" Modelling and Simul Mater Sci Eng 2004, 12, S59-S71
• Helfer CA, Mattice WL, Chen D "Substituted poly(silylenemethylene)s with short range interactions that induce a preference for the same local conformation in unperturbed atactic, isotactic, and syndiotactic chains" Polymer 2004, 45, 1297-1306
• Mattice WL, Helfer CA, Sokolov AP "On the relationship between the characteristic ratio of a finite chain, C_n, and the asymptotic limit, C_infinity" Macromolecules 2003, 36, 10071-10078
• Helfer CA, Xu G, Mattice WL, Pugh C "Monte Carlo simulations investigating the threading of cyclic poly(ethylene oxide) by linear chains in the melt" Macromolecules 2003, 36, 9924-9928
• Helfer CA; Mendicuti F; Mattice WL "Steady-state fluorescence of polymers" in Comprehensive Desk Reference on Polymer Characterization and Analysis, Brady RF, Ed, Oxford Univ Press, 2003, pp 282-301.
• Mattice WL; Helfer CA "Conformations and configuration" in Encyclopedia of Polymer Science and Technology, Kroschwitz, JI, ed., Wiley, New York, 3rd ed, 2002, 22 pp.
• Pugh C; Small AC; Helfer CA; Mattice WL "Induction of smectic layering in nematic liquid crystals using immiscible components. IV. The effect of bulky lateral carboxyl substituents on the thermotropic behavior of 2,5-bis[(4'-(n-(perfluoroheptyl)octyloxy)benzoyl)oxytoluene" Liq Cryst 2001, 28, 991-1001
• Meng H; Saito T; Rinaldi PL; Wyzgoski F; Helfer CA; Mattice WL; Harwood HJ "3D NMR characterization of chain ends formed by phosphinyl radical initiated polymerization of styrene" Macromolecules 2001, 34, 801-811
• Steynberg JP; Brandt EV; Ferreira D; Helfer CA; Mattice WL; Gornik D; Hemingway RW "Conformational analysis of oligomeric flavanoids. Part 2. Methylether acetate derivatives of profisetinidins" Magn Reson Chem 1995, 33, 611-620
• Helfer CA; Mattice WL "Conformation and dynamics of condensed tannins" Trends in Polym Sci 1995, 3, 117-122
• Helfer CA; Sun JS; Matties MA; Mattice WL; Hemingway RW; Steynberg JP; Kelly LA "Implications of the fluorescence for the conformational analysis of polymeric profisetinidins and procyanidins" Polym Bull 1995, 35, 79-85
• Fronczek FR; Hemingway RW; McGraw GW; Steynberg JP; Helfer CA; Mattice WL "Crystal structure and conformational analysis of tetra-O-methyl-(+)-catechin" Biopolymers 1993, 33, 275-282
• Helfer CA; Mattice WL "Conformational analysis of profisetinidin dimers" in Plant Polyphenols: Biogenesis, Chemical Properties, and Significance Hemingway RW; Laks PE, Eds., Plenum Press: New York City, New York, 1992, pp 479-485