Optics and Photonics Research Faculty
phone: 404-894-4026Optics + Photonics Research Area Affiliations
Research Summary
Dr. Collard's work focuses primarily on molecular self assembly in polymers; surfactants, spontaneously assembled monolayers, and liquid crystals; and supramolecular assemblies.
Biographical Sketch
The main focus of Dr. Collard’s is the molecular self-assembly in polymers which allows for the formation of new supermolecular architectures that take on new functions and promise potential benefits and novel applications. Currently, we are studying surfactants, spontaneously assembled monolayers, and liquid crystals. Materials under study include conjugated electronically conductive polymers and new functional polyesters. Techniques used to construct and probe the structure of our supramolecular assemblies including: synthesis, electrochemistry, thermal analysis, x-ray diffraction and microscopy.
Conducting Polymers. Electronically conductive polymers have a broad range of potential applications including sensors, displays, optical communication, and microelectronics. The polymers of interest have highly conjugated backbones, such as polyacetylene and polythiophene. To prepare ordered ( i.e. , crystalline) polymers we have prepared monomers which are surfactants and liquid crystals. The polymer chain structure and chain packing are studied for their effect on conjugation and charge migration.
New Functional Copolyesters. Despite well-developed markets (fibers, food and beverage packaging), and a world shortage of feedstock, fundamental questions about the structure of poly(ethylene terephthalate), PET, remain unanswered. Copolymers and polymers with pendant functional groups are prepared to develop structure-property relationships and to optimize properties. Research goals include: decreased permeability to carbon dioxide and oxygen, increased glass transition temperature, increased tensile strength and increased modulus. Incorporation of the anthracenate unit into PET allows for the modification of polymer properties through grafting with dienophiles.
Representative Publications
?-Stacked Conjugated Polymers: The Influence of Paracyclophane ?-Stacks on the Redox and Optical Properties of a New Class of Broken Conjugated Polythiophenes, F. Salhi, D.M. Collard, Advanced Materials 2003 ,15 , 81.
Fibronectin Adsortion and Cell Adhesion to Mixed Monolayers of Tri(ethylene glycol)- and Methyl-terminated Alkanethiols, J.R. Capadona, D.M. Collard, A.J. Garcia, Langmuir 2003 ,19 , 1847.
Surface Chemistry Modulates Fibronectin Conformation and Directs Integrin Binding and Specificity to Control Cell Adhesion, B.G. Keselowsky, D.M. Collard, A.J. Garcia, Journal of Biomedical Materials Research 2002 , 29-53.
Diels-Alder Modification of Poly(ethylene terephthalate-co-anthracene-2,6-carboxylate) with N-Substituted Maleimides, M. Vargas, R.M. Kriegel, D.M. Collard, D.A. Schiraldi, Journal of Polymer Science ,2002 ,40 , 3256-63.
Control of the Anchoring Behavior of Polymer Dispersed Liquid Crystals: The Effect of Branching in the Side Chains of Polyacrylates, J. Zhou, D.M. Collard, J.O. Park, M. Srinivasarao, The Journal of the American Chemical Society 2002 ,124 , 9980-9981.
The Influence of ?-Stacking on Redox Properties of Oligothiphe nes: (a-Alkyloligothienyl)para[2.2]cyclophanes , F. Salhi, B. Lee , C. Metz, L.A. Bottomley, D.M. Collard, Organic Letters 2002 ,4, 3195.
Micropatterned Surfaces to Engineer Focal Adhesions for Analysis of Cell Adhesion Strengthening, N.D. Gallant, J. Capadona, A.B. Frazier, D.M. Collard and A.J. Garcia, Langmuir 2002 ,18 , 5579-5584.
Fiber Spinning, Structure and Properties of Poly (ethylene terephthalate- co -4,4-bibenzoate) Copolyesters, H. Ma , M. Hibbs, D.M. Collard, S. Kumar, D.A. Schiraldi, Macromolecules 2002 ,35 ,5123-5130.
2,6- Anthracenedicarboxylate -containing Polyesters and Copolyesters D.M Collard, D.A. Schiraldi, in Functional Condensation Polymers , G. Swift, C. Carraher (eds.), Kluwer, 2002 , pp237-248.
From the Textbook to the Lecture: Improving Pre-Lecture Preparation in Organic Chemistry, D.M. Collard, S.P. Girardot, H.M. Deutsch, Journal of Chemical Education ,2002 ,79 , 520-523.
Synthesis And Pharmacology of Potential Site-Specific Cocaine Abuse Treatment Agents: The Role of the Phenyl Group in 2-Substituted-6-Aminobicyclo[2.2.2]octanes, S. Coons, S. Javanmard, H.M. Deutsch, D.M. Collard, M.J. Kuhar, M.M. Schweri, Medicinal Chemistry Research ,2002 ,11 , 24-38.
Engineering of Integrin-Specific Biomi metic Surfaces to Control Cell Adhesion and Function, A.J. Garcia, D.M. Collard, B.G. Keselowsky, S.M. Cutler, N.D. Gallant, B.A. Byers, S.N. Stephansson, in Biomemetic Materials and Design: Biointerfacial Strategies, Tissue Engineering and Targeted Drug Delivery , Marcel Dekker, Inc, New York, NY 2002 , pp29-54.
The Effect of Comonomers on the Rate of Crystallization of PET: U-Turn Comonomers, D.M. Connor , SD. Allen, D.M. Collard, C.L. Liotta, D.A. Schiraldi, Journal of Applied Polymer Science ,2001 ,81 , 1675-1682.
Oxygen Barrier Properties of Poly(ethylene terephthalate) Modified with a Small Amount of Aromatic Comonomer, A. Polyakova, D.M. Connor, D.M. Collard, D.A. Schiraldi, A. Hiltner, E. Baer, Journal of Polymer Science, Part B: Polymer Physics ,2001 ,39 , 1900-1910.
Poly(alkylene 2,6-dicarboxylate)s, R.M. Kriegel, D.M. Collard, C.L. Liotta, D.A. Schiraldi, Macromolecular Chemistry and Physics, 2001 ,202 ,1776-1781.
The Effect Of Linear Comonomers On The Rate Of Crystallization Of Copolyesters, D.M. Connor, S.D. Allen, D.M. Collard, C.L. Liotta, D.A. Schiraldi, Journal of Applied Polymer Science 2001 ,80 , 2696 .
Synthesis and Spectroscopic Analysis of a Cyclic Acetal: A Dehydration Performed in Aqueous Solution, D.M. Collard, A.G. Jones, R.M. Kriegel, Journal of Chemical Education 2001 ,78 , 70-72.
Liquid Crystalline Regioregular Semifluoroallkyl-Substitued Polythiophenes, X.M. Hong , D.M. Collard, Macromolecules ;2000 ,33 , 6916-6917.
Suzuki Cross-coupling Reactions Catalyzed by Palladium Nanoparticles in Aqueous Solution, Y. Li, X.M. Hong, D.M. Collard, M.A. El-Sayed, Organic Letters 2000 ,2, 2385-2388.
Photocrosslinkable Copolyesters: Poly(alkylene terephthalate-co-1,4-phenylene bisacrylate), M. Vargas, D.M. Collard, C.L. Liotta; D.A. Schiraldi, Journal of Polymer Science 2000 ,38 , 2167-2176 .
Controlling the Macromolecular Architecture of Poly(3-alkylthiophene)s by Alternating Alkyl and Fluoroalkyl Substituents, X. Hong, J.C. Tyson, D.M. Collard, Macromolecules 2000 ,33 , 3502-3504.
Photochemical Crosslinking of Poly(ethylene terephthalate- co -2,6-anthracenedicarboxylate), J.R. Jones, C.L. Liotta, D.M. Collard, D.A. Schiraldi, Macromolecules 2000 ,33 , 1640-1645 .
Pyrene and Anthracene Dicarboxylic Acids as Fluorescent Brightening Comonomers for Polyester, D.M. Connor, R.M. Kriegel, D.M. Collard, C.L. Liotta, D.A. Schiraldi, Journal of Polymer Science 2000 ,38 , 1291-1301.
Photoinduced Vibrational Absorptions from Poly(3-octylthiophene)/Fe 2O3Nanoparticle Composite: A Time-resolved FTIR Study J.P. Wang, B.S. Zou, X.Y. Hong, D.M. Collard, Synthetic Metals 2000 ,113 , 223-226.
“Cross-linking and modification of poly(ethylene terephthalate-co-2,6-anthracenedicarboxy) by Diels-Alder reactions with malemides,” J. R. Jones, C. L. Liotta, D. M. Collard, D. A. Schiraldi, Macromolecules ,1999 ,32 , 5786-5792.
“Chemical and electrochemical polymerization of 3-alkylthiophenes on self-assembled monolayers of oligothiophene-substituted alkylsilanes,” S. Inaoka, D. M. Collard, Langmuir ,1999 ,15 , 3752-3758.
“Grafting, chain extension and crosslinking of poly(ethylene terephthalate- co -2,6-anthracenedicarboxylate) by diels-alder reactions with maleimides,” J.R. Jones, C.L. Liotta, D.M. Collard, D.A. Schiraldi, Macromolecule s, 1999 ,32 , 5786-5792.
“An efficient synthesis of 4,5,9,10-tetrahydropyrene: a useful synthetic intermediate for the synthesis of 2,7-disubstituted pyrenes,” D.M. Connor, S.D. Allen, D.M. Collard, C.L. Liotta, D.A. Schiraldi, Journal of Organic Chemistry ,1999 , 6888-6890.
“Synthesis, polymerization and characterization of substituted dithieno[3,4-b:3',4'-d]thiophenes,” S. Inaoka; D.M. Collard, Journal of Materials Chemistry ,1999 ,9, 1719.
“Synthesis and oxidative polymerization of semifluoroalkyl-substituted thiophenes,” X. Hong, J.C. Tyson, J.S. Middlecoff, D.M. Collard, Macromolecules ,1999 ,32 , 4232-4239.
