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Author: jack douglas
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Displaying records 31 to 40 of 224 records.
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31. Plasticization Effect of C^d60^ on the Fast Dynamics of Polystyrene and Related Polymers: An Incoherent Neutron Scattering Study
Published: 2/19/2008
Authors: Alejandro Sanz, Markus Ruppel, Jack F Douglas, J Cabral
Abstract: We utilize inelastic incoherent neutron scattering (INS) to quantify how fullerenes affect the fast molecular dynamics of a family of polystyrene related macromolecules.. Apparent Debye-Waller (DW) factors are determined as a function of temperatur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852753

32. Model for Reversible Nanoparticle Assembly in a Polymer Matrix
Published: 1/8/2008
Authors: Andrew Rahedi, Jack F Douglas, Francis W. ~undefined~undefined~undefined~undefined~undefined Starr
Abstract: The clustering of nanoparticles (NP) within solutions and polymer melts depends sensitively on the strength and directionality of the NP interactions involved, as well as the molecular geometry and interactions of the dispersing fluids. Since cluster ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852802

33. Block Copolymer Ordering With a Spatiotemporally Inhomogeneous Mobility
Published: 11/20/2007
Authors: August W. Bosse, Jack F Douglas, Brian Berry, Ronald Leland Jones, Alamgir Karim
Abstract: Motivated by recent measurements of zone annealing in block copolymer films at low temperatures, we implement a spatiotemporal mobility gradient with intrinsic variations associated with dynamic heterogeneities in the saddle point relaxation of a dib ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852741

34. Shear-Induced Conductor-Insulator Transition in Melt Mixed Polypropylene-Carbon Nanotube Dispersions
Published: 11/15/2007
Authors: Jan Obrzut, Jack F Douglas, S B. Kharchenko, Kalman D Migler
Abstract: The blending of carbon nanotubes (CNT) into polymer matrices leads to intrinsically non-equilibrium materials whose properties can depend strongly on flow history. We have constructed a rheo-dielectric spectrometer that allows for the simultaneous in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852746

35. The Effect of Temperature on the Morphology and Kinetics of Surface Pattern Formation in Thin Block Copolymer Films
Published: 10/29/2007
Authors: A P Smith, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: Hole formation and size evolution on the surface of thin films of symmetric diblock copolymers is simultaneously investigated as a function of time, t, temperature, T, and film thickness, h. The hole size h approaches a steady state value at long ti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852729

36. Atomic Motion During the Migration of General [001] Tilt Grain Boundaries in Ni
Published: 8/24/2007
Authors: Hao Zhang, David J Srolovitz, Jack F Douglas, James A Warren
Abstract: We generalize a previous study of the atomic motions governing grain boundary migration to consider arbitrary misorientations of [001] tilt boundaries. Our examination of the nature of atomic motions employed three statistical measures: the non-Gau ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853470

37. Relaxation Behavior of Polymer Structures Fabricated by Nanoimprint Lithography
Published: 8/14/2007
Authors: Yifu Ding, Hyun W. Ro, Thomas Avery Germer, Jack F Douglas, Brian C. Okerberg, Alamgir Karim, Christopher Soles
Abstract: We study the decay of the imprinted polystyrene (PS) patterns under thermal annealing using light diffraction. The first order diffraction intensity from the imprinted gratings was measured as a function of annealing time. Local intensity maximum i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852744

38. Characterization of the Potential Energy Landscape in an Antiplasticized Polymer
Published: 7/6/2007
Authors: Robert A Riggleman, Jack F Douglas, J J de Pablo
Abstract: Transition state searches have been performed on model coarse-grained polymer systems, and the results compared to those of an antiplasticized polymer system, which have been previously shown to be fragile and strong glass-forming systems, respective ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852732

39. Tuning Polymer Melt Fragility With Antiplasticizer Additives
Published: 6/19/2007
Authors: Robert A Riggleman, Jack F Douglas, J J de Pablo
Abstract: A polymer-diluent model exhibiting antiplasticization has beendeveloped and characterized by molecular dynamics simulations. Antiplasticizer molecules are shown to decrease the glass transition temperature Tg, but to increase the elastic moduli o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852717

40. Relationship between dispersion metric and properties of PMMA/SWNT nanocomposites
Published: 6/13/2007
Authors: Takashi Kashiwagi, Jeffrey A Fagan, Jack F Douglas, Kazuya Yamamoto, Nathanael A Heckert, Stefan D Leigh, Jan Obrzut, Fangming Du, Minfang Mu, Sheng Lin-Gibson, K Winey, R Haggenmueller
Abstract: Particle spatial dispersion is a crucial characteristic of polymer composite materials and this property is recognized as especially important innanocomposite materials due to the general tendency of nanoparticles to aggregate under processing condit ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=854038



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