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You searched on: Topic Area: Polymers

Displaying records 51 to 60 of 400 records.
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51. 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

52. 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

53. 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

54. 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

55. 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

56. Block copolymer photonic gel for mechanochromic sensing
Topic: Polymers
Published: 9/19/2011
Authors: Edwin P Chan, Joseph J Walish, Edwin L Thomas, Christopher M Stafford
Abstract: In this work, we describe a strategy based on mechanochromic sensing, the coupling between mechanical and optical properties, of a block copolymer photonic gel. Although this phenomena has been observed in many materials, we demonstrate this concept ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908410

57. Characterizing the Mechanical Properties and Degradation of Thin Polymer Membranes
Topic: Polymers
Published: 8/28/2011
Authors: Christopher M Stafford, Jun Y. Chung, Junghyun Lee
Abstract: The elasticity, strength, and toughness of thin polymer membranes are of considerable interest since direct knowledge of these key mechanical properties can provide insight into performance, durability, and underlying degradation mechanisms that occu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908218

58. Quantifying the Transport Properties of Thin Polymer Gels via an Indentation-Based Technique
Topic: Polymers
Published: 8/28/2011
Authors: Edwin P Chan, Yuhang Hu, Peter M. Johnson, Zhigang Suo, Christopher M Stafford
Abstract: Recently, an indentation approach has been demonstrated to quantify the poroelastic relaxations of hydrogels. Although the approach has been demonstrated to quantify the transport properties of thick hydrogel materials, its relevance for thin hydrog ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908228

59. Characterization of the non-uniform reaction in chemically-amplified calix[4]resorcinarene molecular resist thin films
Topic: Polymers
Published: 7/19/2011
Authors: Vivek M Prabhu, Shuhui Kang, Regis J Kline, Dean M DeLongchamp, Daniel A Fischer, Wen-Li Wu, Sushil K. Satija, Jing Sha, Christopher K. Ober, Peter V. Bonnesen
Abstract: The ccc stereoisomer-purified tert-butoxycarbonyloxy (t-Boc) protected calix[4]resorcinarene molecular resists blended with photoacid generator exhibit a non-uniform photoacid catalyzed reaction in thin films. The surface displays a reduced reaction ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908683

60. Stiffness, strength, and ductility of thin films and membranes ‹ A combined wrinkling-cracking methodology
Topic: Polymers
Published: 7/15/2011
Authors: Jun Y. Chung, Junghyun Lee, Kathryn L Beers, Christopher M Stafford
Abstract: Polymer membranes are at the core of a diverse set of technologies critical to our global health and security, ranging from energy production to water purification to carbon capture. These engineered membranes must maintain performance over many yea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908241



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