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Displaying records 201 to 210 of 227 records.
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201. Comparison of Methods for Calculating the Friction Coefficient and Intrinsic Viscosity of Nanoparticles and Macromolecules
Published: Date unknown
Authors: M Mansfield, Jack F Douglas, Saba Irfan, E Kang
Abstract: Various methods have been proposed to estimate the translational friction coefficient f and the intrinsic viscosity [?] of polymers and other particles of complex shape. These methods range from first-principles calculations based on a precise desc ...

202. Coping With Complex Surfaces: An Interface Between Mathematics and Condensed Matter Physics
Published: Date unknown
Author: Jack F Douglas
Abstract: A transcript of a talk on the application of mathematics to materials science is presented. The talk considers the application of random walk methods to solving boundary value problems with complex boundaries, as found in applications to polymer and ...

203. Coupling Between Phase Separation and Surface Deformation Modes in Self-Organizing Polymer Blend Films
Published: Date unknown
Authors: B D Ermi, G Nisato, Jack F Douglas, J Rogers, Alamgir Karim
Abstract: Phase separation of ultrathin polymer blend films spun cast onto patterned self-assembled monolayers is examined by atomic force microscopy. Fourier transform analysis of the time evolution of the film topography reveals a coupling between the phase ...

204. Crystallization of Poly(ethylene oxide) on Topographically Patterned Substrates
Published: Date unknown
Authors: Brian C. Okerberg, Christopher L Soles, Jack F Douglas, Alamgir Karim
Abstract: Crystallization of poly(ethylene oxide) (PEO) on topographically patterned substrates is investigated. Primary nucleation was dramatically enhanced during solvent drying on patterned substrates compared to flat films. The nucleation density also in ...

205. Dendritic Crystallization in Thin Films of PEO/PMMA Blends: A Comparison to Crystallization of Small Molecule Liquids
Published: Date unknown
Authors: Brian C. Okerberg, H Marand, Jack F Douglas
Abstract: Dendritic crystallization of PEO/PMMA thin films is reported. The film thickness is kept constant while the PMMA molar mass and blend composition are varied. Some basic features of dendritic growth, such as the diffusion length and tip curvature ar ...

206. Dispersion and Shear Viscosity of a Simulated Polymer Nanocomposite
Published: Date unknown
Authors: Francis W. ~undefined~undefined~undefined~undefined~undefined Starr, Jack F Douglas, S C Glotzer
Abstract: Using molecular dynamics simulations, we explore properties affecting nano-filler dispersion in a dense bead-spring polymer melt, and how the state of dispersion alters the response of the system to shear. We determine a simple metric to determine t ...

207. Effects of Aspect Ratio of Multi-Walled Carbon Nanotube on Flammability Properties of Polymer Nanocomposites
Published: Date unknown
Authors: Bani Cipiriano, Takashi Kashiwagi, Srinivasa R. Raghavan, Ying Yang, E A Grulke, Kazuya Yamammoto, John R Shields, Jack F Douglas
Abstract: The effects of the aspect ratio of multi-walled carbon nanotube (MWNT) on viscoelastic properties and flammability properties of PS/MWNT nanocomposites are studied with two different MWNTs having average aspect ratios of 49 and 150. While no signifi ...

208. Entanglement Effects on the Dewetting of Polymer Thin Films
Published: Date unknown
Authors: K A Barnes, Alamgir Karim, Jack F Douglas, Da-Wei Liu, Eric J. Amis
Abstract: We investigate the dewetting of entangled and unentangled polymer films from model viscous polymer and inorganic substrates. Linear and hypergraft polyethyloxazoline (PEOX) polymers are chosen as the unentangled and entangled dewetting fluid, respec ...

209. Flammability Properties of PMMA-Single Walled Carbon Nanotube Nanocomposites
Published: Date unknown
Authors: Takashi Kashiwagi, F Du, K Winey, K M. Groth, John R Shields, Richard H. Harris Jr., Jack F Douglas
Abstract: Flammability properties of PMMA/SWNT nanocomposites were measured. The addition of SWNT significantly reduces mass loss rate of PMMA even for the contents less than a 1 % mass fraction. The dispersion of tubes affects flammability properties.

210. Flammability Properties of Poly(methyl methacrylate)-Single Walled Carbon Nanotube Nanocomposites
Published: Date unknown
Authors: Takashi Kashiwagi, K Winey, Richard H. Harris Jr., John R Shields, Jack F Douglas
Abstract: Recent measurements on polymer nanocomposites filled with multiple-walled carbon nanotubes (MWNT) have indicated that these nanoparticles are highly effective fire retardants at low loading (1 wt.-%). We report here similar results for single-walled ...

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