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Topic Area: Polymers

Displaying records 61 to 70 of 537 records.
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61. Manipulating Interfacial Relaxations at Buried Interfaces in Polymer Coatings as Probed by Creep and Adhesion Measurements
Topic: Polymers
Published: 4/14/2011
Authors: Peter M. Johnson, John A. (John A) Howarter, Christopher M Stafford
Abstract: In this work, we use constant load indentation and cantilever peel of polymer films to measure relaxation events due to the chemical modification of a buried interface. Hydroxypropyl cellulose films on four different chemical interfaces were produce ...

62. Modulus-Driven Differentiation of Marrow Stromal Cells in 3D Is Independent of Cytoskeletal Integrity
Topic: Polymers
Published: 4/11/2011
Authors: Carl George Simon Jr, Kaushik Chatterjee, Sapun Parekh, Sheng Lin-Gibson, Nicole M. Moore, Marcus T Cicerone, Marian F Young
Abstract: Cell functions such as proliferation, migration, and differentiation are key physiological processes that are influenced by the physiochemical extracellular environment. We report on the effect of three-dimensional (3D) scaffold modulus on human bon ...

63. Synthesis of Thiol-Clickable and Block Copolypeptide Brushes via Nickel-Mediated Surface Initiated Polymerization of alpha-Amino Acid N-Carboxyanhydrides (NCAs)
Topic: Polymers
Published: 3/31/2011
Authors: Bradley J Sparks, Jacob G Ray, Daniel A Savin, Christopher M Stafford, Derek L Patton
Abstract: We describe the synthesis of homo-, block, and clickable co-polypeptide brushes from low surface area substrates using nickel-mediated surface-initiated polymerization of alpha-amino N-carboxyanhydrides.

64. Thermoreversible Gels from Mixtures of a High-melting Ionic Liquid and a Polar Polymer for Self-Healing Materials
Topic: Polymers
Published: 3/27/2011
Authors: Joonsung (Joonsung) Yoon, Christopher M Stafford
Abstract: We investigate a new kind of PVOH physical gel in which the volatile water is replaced with a non-volatile ionic liquid (IL). High melting IL containing Br- anion was chosen so that the hydrogen-bond accepting Br- can enhance miscibility with PVOH wh ...

Topic: Polymers
Published: 3/25/2011
Authors: Santanu S. Kundu, Atul S Bhangale, William E Wallace III, Kathleen M. Flynn, Charles Martin Guttman, Richard Gross, Kathryn L Beers
Abstract: Enzymes immobilized on solid supports are increasingly used for chemical transformation because the process is greener and sustainable. Here we use microreactors to study enzyme catalyzed ring opening polymerization of -caprolactone to polyca ...

66. Revealing the Interphase in Polymer Nanocomposites
Topic: Polymers
Published: 3/16/2011
Authors: Mauro Zammarano, Paul Hutsell Maupin, Li Piin Sung, Jeffrey W Gilman, Douglas Matthew Fox
Abstract: Morphological characterization of polymer nanocomposites is a fundamental challenge that is complicated by multiple length scales. Here, we report a technique for high-throughput monitoring of interphase and dispersion in polymer nanocomposites based ...

67. Preparation and Characterization of Physical Gels based on Ionic Liquid and Poly(vinyl alcohol)
Topic: Polymers
Published: 2/28/2011
Authors: Joonsung (Joonsung) Yoon, Hae-Jeong Lee, Christopher M Stafford
Abstract: We report the preparation and characterization of physical gels using mixtures of poly(vinyl alcohol) (PVOH) and a high melting ionic liquid (IL), 1-ethylpyridinium bromide. Similar to PVOH hydrogels, these mixtures show elastic responses in uniaxial ...

68. Flexure-induced structural and electronic changes in polymer supported membranes of length purified single-wall carbon nanotubes
Topic: Polymers
Published: 2/22/2011
Authors: John M. Harris, Ganjigunte R.S. Iyer, Daneesh O. Simien, Jeffrey A Fagan, JiYeon Huh, Jun Y. Chung, Steven D Hudson, Jan Obrzut, Jack F Douglas, Christopher M Stafford, Erik K Hobbie
Abstract: Thin membranes of length purified single-wall carbon nanotubes (SWCNTs) are uniaxially compressed by depositing them on prestretched polymer substrates. Upon release of the strain, the topography, microstructure and conductivity of the films are c ...

69. Block-copolymer photonic crystal gel for mechanical strain sensing
Topic: Polymers
Published: 2/13/2011
Authors: Edwin P Chan, Christopher M Stafford, Edwin L Thomas, Joseph Walish

70. Effect of interfaces and adhesion on the creep compliance of thin polymer coatings
Topic: Polymers
Published: 2/13/2011
Authors: Peter M. Johnson, John A. (John A) Howarter, Christopher M Stafford
Abstract: Thin film indentation experiments on viscoelastic materials allowed for the deconvolution of the bulk compliance from interfacial responses at the buried interface. This technique could discriminate both large changes in the interfacial strength due ...

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