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Topic Area: Polymers

Displaying records 51 to 60 of 547 records.
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51. 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

52. 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

53. 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

54. 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

55. Viscoelastic Property Mapping with Contact Resonance Force Microscopy
Topic: Polymers
Published: 11/4/2011
Authors: Jason Philip Killgore, Donna C. Hurley, Dalia Yablon, Joseph Turner, Philip Yuya, Roger Proksch, Anil Gannepalli, Andy Tsou
Abstract: We demonstrate accurate nanoscale mapping of loss and storage modulus on a polystyrene-polypropylene blend with contact resonance force microscopy (CR-FM). The viscoelastic properties are extracted from spatially resolved maps of the contact resonanc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909102

56. 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

57. 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

58. 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 W. 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

59. 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

60. 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



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