Haskell W. Beckham, Ph.D.
Threaded and Cyclic Macromolecules
NMR of Fluids in Porous Substrates
Group, Facilities, Other Publications
Threaded and Cyclic Macromolecules
Rotaxanated polymers consist of cyclic molecules threaded onto linear polymer segments. These topological copolymers combine the characteristics of the two components in ways that yield bulk properties that are different from analogous block or graft copolymers. We are examining the molecular dynamics, phase structures, and bulk properties of these materials using a variety of physical techniques.
"Chain Dynamics of Polyoxyethylene in Nanotubes of a-Cyclodextrin by Solid-State 2H NMR", Macromol. Chem. Phys. 2005, 206, 998-1005; TE Girardeau, J Leisen and HW Beckham.
"Solid Inclusion Complexes of a-Cyclodextrin and Perdeuterated Polyoxyethylene", Macromolecules 2005, 38(6), 2261-2270; TE Girardeau, T Zhao, J Leisen, HW Beckham, and DG Bucknall.
"Self-Diffusion of Cyclic and Linear Poly(oxyethylene) Melts by Pulsed-Field-Gradient NMR", PMSE Prepr. (Am. Chem. Soc., Div. Polym. Mater.: Sci. & Eng.) 2005, 93, 597-598; S Nam, J Leisen, and HW Beckham.
"Direct Synthesis of Cyclodextrin-Rotaxanated Poly(ethylene glycol)s and their Self-Diffusion Behavior in Dilute Solution", Macromolecules 2003, 36(26), 9859-9865; T Zhao and HW Beckham.
"Purification of Cyclic Polymers Prepared from Linear Precursors by Inclusion Complexation of Linear Byproducts with Cyclodextrins", Macromolecules 2003, 36(18), 6945-6948; S Singla, T Zhao and HW Beckham.
"Quantitative Determination of Threading in Rotaxanated Polymers by Diffusion-Ordered NMR Spectroscopy", Macromolecules 2003, 36(13), 4833-4837; T Zhao, HW Beckham and HW Gibson.
"NMR Studies of Rotaxanated Polymers" Polym. Prepr. 2003, 44(1), 263-264; HW Beckham, K Nagapudi, T Girardeau, T Zhao, and J Leisen.
"Synthesis of a Heterogeneous Rotaxanated Polymer: Poly[pseudo(methyl methacrylate-rotaxa-(dimethylsiloxane)]", Polym. Prepr. 2003, 44(1), 839-840; BM White, WP Watson, and HW Beckham.
"Synthesis and Efficient Purification of Cyclic Polydimethylsiloxane", Macromolecules 2002, 35, 5345-5348; BM White, WP Watson, EE Barthelme, and HW Beckham.
"Solid-State NMR Investigations of Poly[(acrylonitrile)-rotaxa-(60-crown-20)]", Macromolecules 1999, 32, 3025-3033; with K Nagapudi, J Leisen and HW Gibson.
"Synthesis, Dynamic Mechanical, and Solid-State NMR Spectroscopy of Crown-Ether-Based Aliphatic Polyurethane Rotaxanes", Macromol. Chem. Phys. 1999, 200, 2541-2550; with K Nagapudi, J Hunt, J Baker, and C Shepherd.
NMR Studies of Fluids in Porous Substrates
Uptake and loss of water are among the most important functions of textiles, impacting both their manufacture as well as end-use application. Nuclear magnetic resonance (NMR) is the basis of a particularly powerful suite of techniques with which to examine water (and other fluids) inside anisotropic porous media. A variety of NMR methods (imaging, diffusion, spectroscopy) are being used to extract a deeper understanding of the interactions of water with porous substrates.
"Sorption Isotherm Measurements by NMR", Solid-State NMR 2002, 22(2-3), 409-422; J Leisen, HW Beckham, and M Benham.
"Through-Plane Diffusion of Moisture in Paper Detected by Magnetic Resonance Imaging", Industrial and Engineering Chem. Res. 2002, 41(25), 6555-6565; J Leisen, B Hojjatie, DW Coffin, SA Lavrykov, BV Ramarao, and HW Beckham.
"Quantitative Magnetic Resonance Imaging of Fluid Distribution and Movement in Textiles", Textile Research Journal 2001, 71(12), 1033-1045; J Leisen and HW Beckham.
"In-plane Moisture Transport in Paper Detected by Magnetic Resonance Imaging", Drying Technology 2001, 19(1), 201-208; with J Leisen, B Hojjatie, and DW Coffin.
"Through-Air Drying of Unbacked Tufted Carpet", Textile Research Journal 2001, 71(7), 613-620; HS Lee, WW Carr, J Leisen, and HW Beckham.
"A Model of Through-Air Drying of Tufted Textile Materials", International Journal of Heat and Mass Transfer 2001, 78(2), 357-366; HS Lee, WW Carr, HW Beckham and J Leisen.
"Factors Influencing the Air Flow Through Unbacked Tufted Carpet", Textile Research Journal 2000, 70(10), 876-885; HS Lee, HW Beckham, WW Carr, and WJ Wepfer.
"Magnetic Resonance Imaging of Water Ingress and Distribution in Fluorochemical-Finished Polyester Cut-Pile Carpet", Textile Chemist and Colorist 1999, 31, 21-26; J Leisen, WW Carr, S Warner, J Good and HW Beckham.
"Observation of the Water Distribution during Drying of Textiles", In Spatially Resolved Magnetic Resonance, B Blümich, P Blümler, R Botto, and E Fukushima, Eds.; New York: Wiley-VCH, 1998, pp 265-272; J Leisen, L Hou, WW Carr and HW Beckham.
"Nuclear Magnetic Resonance Imaging of Water Distributions in Loop-Pile Nylon Carpet Tile", J. Textile Institute, Part 1 1998, 89(2); 436-440; HW Beckham, WW Carr, C Fülber, HW Spiess and B Blümich.
Crosslinkable Materials and Membranes
Permselective membranes are important components for commercial chemical separations. New materials are needed that are processible into complex forms such as hollow fibers, yet stable at high temperatures and against noxious chemical mixtures. We are exploring new material systems that exhibit these properties, primarily focusing on post-processing crosslinking chemistries that proceed without decreasing permeability.
"Dependence of thermal properties on the copolymer sequence in diacetylene-containing polycarboranylenesiloxanes", Chem. Mater. 2004, 16, 3162-3167; MK Kolel-Veetil, HW Beckham and TM Keller.
"Localized Chain Mobility and Gas Transport Properties of Thermoplastic Aromatic Polymers", J. Membr. Sci. 2002, 208, 257-267; S Singla, HW Beckham and ME Rezac.
"Diacetylene-Terminated Diacetylene-Containing Polysiloxanes", J. Mater. Chem. 2002, 12(12), 3363-3365; HW Beckham and TM Keller.
"Solid-State Complexes of Hexafluoro-2-propanol with Benzophenone-Containing Polyimides", Macromolecules 2001, 34(25), 8730-8734; GK Sturgill, C Stanley, ME Rezac and HW Beckham.
"Influence of Crosslinking Technique on the Physical and Transport Properties of Ethynyl-Terminated Monomer/ Polyetherimide Asymmetric Membranes", J. Membr. Sci. 2001, 191(1-2), 1-11; CN Dudley, B Schöberl, GK Sturgill, ME Rezac and HW Beckham.
"Solution polymerization of an a,w-diethynyl diimide to a diacetylene-containing polyimide via oxidative coupling", Polymer 2001, 42(5), 2031-2037; NT Karangu, TE Girardeau, GK Sturgill, ME Rezac, and HW Beckham.
"Synthesis and Properties of Processable Polyimides Containing Diacetylene Groups", Chem. Mater. 1998, 10, 567-573; NT Karangu, ME Rezac and HW Beckham.
"Crosslinked Diacetylene-Functionalized Polyimides for Gas Separation Membranes: Polymer Reactivity and Resultant Properties" ACS Symposium Series 733, B Freeman and I Pinnau, Eds.; 1999, pp 244-255; B Bayer, B Schöberl, K Nagapudi, HW Beckham and ME Rezac.
"Transport Properties of Crosslinkable Polyimide Blends", J. Membr. Sci. 1997, 136, 249-259; ME Rezac, ET Sorenson and HW Beckham.
"Self-Diffusion of Poly(p-phenyleneethynylene)s in Dilute Solution Determined by Pulsed-Field-Gradient NMR", Polymer, 2005, 46, 4839-4844; T Zhao, HW Beckham, HL Ricks and UHF Bunz.
"Evolution of Crystallinity, Chain Mobility and Crystallite Size during Polymer Crystallization", Macromolecules 2004, 37(21), 8028-8034; J Leisen, HW Beckham, and MA Sharaf.
"Structure and Temperature-Dependent Properties of Poly(4-methyl-1-pentene) Fibers", Macromolecules 1997, 30, 3293; S Reddy, P Desai, AS Abhiraman, HW Beckham, AS Kulik, HW Spiess.
"Conformational Disorder and its Dynamics within the Crystalline Phase of the Form II Polymorph of Isotactic Poly(1-butene)", In Multidimensional NMR, FT-IR/Raman, and Fluorescence Spectroscopy of Polymers, M Urban and T Provder, Eds.; ACS Symposium Series, 1995, p 384; HW Beckham, K Schmidt-Rohr and HW Spiess.
"2D Exchange NMR Spectroscopy in Polymer Research", In NMR - Basic Principles and Progress 32, p 163; B Blümich and R Kosfield, Eds.; Berlin: Springer, 1994; HW Beckham and HW Spiess.
"Molecular Nature of the Beta Relaxation in Poly(methyl methacrylate) Investigated by Multidimensional NMR", Macromolecules, 1994, 27, 4733; K Schmidt-Rohr, AS Kulik, HW Beckham, A Ohlemacher, U Pawelzik, C Boeffel, and HW Spiess.
"Phase-Restricted Radiation Crosslinking in Semicrystalline Polyolefins Investigated by Two-Dimensional Solid-State NMR", Die Makromolekulare Chemie 1994, 195, 1471; HW Beckham and HW Spiess.
Prof. Beckham currently serves as chair of the Georgia Tech NMR Users Advisory committee, providing operational assistance for the Georgia Tech NMR Center. The facility contains NMR instrumentation for high-resolution liquids (500 MHz), wide-line solids (300 MHz), and NMR imaging (400 MHz). Prof. Beckham also administers the PTFE Thermal Analysis Center with TGA and DSC capabilities. Other instrumentation and capabilities include FTIR, GPC, MALS, DLS, TD-NMR (23 MHz), moisture sorption gravimetry and capillary flow porometry.
"Thermorheological Consequences of Crystalline-Phase Crosslinking in Polyamide Fibers", J. Appl. Polym. Sci. 1997, 65, 2613; S Thadani, HW Beckham, P Desai, and AS Abhiraman.
"Mechanical Properties of Diacetylene-Functionalized Polyamides", Polymer 1991, 32, 1821; HW Beckham and MF Rubner.
"A New Mechanism of Toughening Glassy Polymers. 1. Experimental Procedures", Macromolecules 1990, 23, 3968; OS Gebizlioglu, HW Beckham, AS Argon, RE Cohen, and HR Brown.
