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You searched on: Topic Area: Polymers

Displaying records 51 to 60 of 405 records.
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51. A Robust and High-Throughput Measurement Platform for Monomer Reactivity Ratios from Surface-Initiated Polymerization
Topic: Polymers
Published: 2/23/2012
Authors: Kirt Anthony Page, Derek Patton, Emily Hoff, Michael J Fasolka, Kathryn L Beers
Abstract: This article describes a robust approach to measure monomer reactivity ratios from surface-initiated copolymerization, by measuring composition of statistical copolymer brush surfaces using x-ray photoelectron spectroscopy. Statistical copolymer br ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910460

52. Rippling Instability of Supported Polymer Nanolines
Topic: Polymers
Published: 2/21/2012
Authors: Vijaya R. Tirumala, Christopher M Stafford, Leonidas E. Ocola, Jack F Douglas, L. Mahadevan
Abstract: The swelling response of polymer line gratings supported on a rigid substrate has direct implications on their mechanical stability during pattern transfer in nanofabrication. The polymer lines, when swollen in a good solvent, undergo a rippling inst ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909469

53. DNA Molecules Descending a Nanofluidic Staircase by Entropophoresis
Topic: Polymers
Published: 1/26/2012
Authors: Samuel M Stavis, Jon C Geist, Michael Gaitan, Laurie E Locascio, Elizabeth A Strychalski
Abstract: A complex entropy gradient for confined DNA molecules was engineered for the first time. Following the second law of thermodynamics, this enabled the directed self-transport and self-concentration of DNA molecules. This new nanofluidic method is term ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908034

54. Mechanical Properties of Polymer Nano-Films
Topic: Polymers
Published: 11/28/2011
Authors: Junghyun Lee, Jun Y. Chung, Christopher M Stafford
Abstract: Three fundamental mechanical properties of supported glassy polystyrene films with thickness ranging from 250 nm to 9 nm were quantitatively determined by a recently developed wrinkling‹cracking method. Films below about 40 nm showed a decrease in bo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909417

55. Molecular Layer-by-Layer Deposition of Highly Crosslinked Polyamide Membranes for Reverse Osmosis Applications
Topic: Polymers
Published: 11/19/2011
Authors: Peter M. Johnson, Joonsung (Joonsung) Yoon, Jennifer Y. Kelly, John A. (John A) Howarter, Christopher M Stafford
Abstract: In membranes for reverse osmosis and nanofiltration, the discriminating layers consist of an interfacially polymerized polyamide film on a porous support. For reverse osmosis membranes, the dominant commercial interfacial film is a crosslinked netwo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908946

56. Impact of Chain Architecture (Branching) on the Thin Film Thermal and Mechanical Behavior of Polystyrene
Topic: Polymers
Published: 11/18/2011
Authors: Jessica M. Torres, Christopher M Stafford, David Uhrig, Vogt D Bryan
Abstract: The modulus and Tg of a series of PS samples with varying architecture are examined in thin films as a function of thickness. The bulk-like, thick film Tg is independent of polymer architecture: linear, comb, centipede and 4 armed star PS. However ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909204

57. Synthesis of Multifunctional Polymer Brushes via Sequential and Orthogonal Thiol-Click Reactions
Topic: Polymers
Published: 11/14/2011
Authors: Santosh B Rahane, Ryan M Hensarling, Bradley J Sparks, Christopher M Stafford, Derek L Patton
Abstract: Fabrication of multifunctional surfaces with complexity approaching that found in nature requires the application of a modular approach to surface engineering. We describe a versatile post-polymerization modification strategy to synthesize multifunc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909721

58. Influence of chain stiffness on thermal and mechanical properties of polymer thin films
Topic: Polymers
Published: 10/25/2011
Authors: Jessica M. Torres, Chengqing C. Wang, E. Bryan Coughlin, John P. Bishop, Richard A. Register, Robert A Riggleman, Christopher M Stafford, Bryan D. Vogt
Abstract: The effect of main chain stiffness and side chain flexibility on the elastic modulus and glass transition temperature (Tg) of thin polymer films is investigated using non-traditional polymers formed from 5-(2-phenylethylnorbornene). Depending on the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909043

59. Morphological Changes Driven by Nanofibrous Scaffolds Induce Marrow Stromal Cell Osteogenesis
Topic: Polymers
Published: 10/11/2011
Authors: Carl George Simon Jr., Kaushik Chatterjee, Christopher K. Tison, Girish Kumar, Patrick S Pine, Marc L Salit, Jennifer H McDaniel, Marian F Young
Abstract: Cells are sensitive to tissue scaffold architecture and these cell-material interactions drive cell functions critical in tissue regeneration. Results presented here demonstrate that nanofiber scaffolds force primary human bone marrow stromal cells ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908027

60. Molecular Order in High-Efficiency Polymer/Fullerene Bulk Heterojunction Solar Cells
Topic: Polymers
Published: 9/22/2011
Authors: Matthew R. Hammond, Regis J Kline, Andrew A Herzing, Lee J Richter, David Germack, Hyun Wook Ro, Christopher L Soles, Daniel A Fischer, Tao Xu, Luping Yu, Michael F. Toney, Dean M DeLongchamp
Abstract: We report quantitative measurements of ordering, molecular orientation, and nanoscale morphology in the active layer of bulk heterojunction organic photovoltaic cells based on a thieno[3,4-b]thiophene-alt-benzodithiophene copolymer (PTB7), which has ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908836



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