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You searched on: Author: jack douglas

Displaying records 221 to 227.
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221. Spinodal Dewetting on Chemically Patterned Substrates
Published: Date unknown
Authors: A Sehgal, V Ferreiro, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: We utilize chemically patterned substrates with arrays of progressively narrower stripes (1-15 mm) to investigate the influence of pattern size on the morphology of dewetting polystyrene films. The early-stage dewetting patterns align with the substr ...

222. Swelling of Grafted Polymer Brushes
Published: Date unknown
Authors: Jack F Douglas, M S Kent, Sushil K. Satija, Alamgir Karim
Abstract: The end-grafting of polymer chains to surfaces provides a robust method for modifying surface properties. Such layers are increasingly being employed in applications-modifying the biocompatibility of implants, the wetting, adhesive and frictional pro ...

223. Temperature Effects on Surface Pattern Formation in Thin Block Copolymer Films
Published: Date unknown
Authors: A P Smith, Jack F Douglas, Eric J. Amis, Alamgir Karim
Abstract: Hole formation on the surface of thin films of symmetric diblock copolymers is investigated as a function of time, t, temperature, T, and film thickness, h. The size of the holes approaches a steady state value at long times and their long-time size ...

224. The Influence of Polymer-Polymer and Polymer-Surface Interactions on the Formation and Swelling of End-Grafted Polymer Layers
Published: Date unknown
Author: Jack F Douglas
Abstract: Investigations at NIST on the influence of polymer-polymer excluded volume and polymer-surface interactions on the formation and swelling of end-grafted polymer layers are reviewed. Recent theoretical modeling of grafted layers having a low grafting ...

225. Thermal Degradation and Flammability Properties of Nanocomposites
Published: Date unknown
Authors: Takashi Kashiwagi, A B. Morgan, Joseph M Antonucci, Richard H. Harris Jr., E A Grulke, J NA Hilding, Jack F Douglas
Abstract: Thermal degradation and flammability properties of the two types of nanocomposites with nanosilica and carbon nanotubes were studied. PMMA, poly(metheyl methacrylate), nanocomposites were made by in situ radical polymerization of MMA, methylmethacryl ...

226. Tuning the Fragility of Polymer Melts With Antiplasticizer Additives
Published: Date unknown
Authors: Robert A Riggleman, K Yoshimoto, Jack F Douglas, J J de Pablo
Abstract: Using molecular dynamics simulations, we have developed and analyzed a model that exhibits antiplasticization behavior by decreasing the glass transition temperature, increasing the density of the system below the glass transition temperature of the ...

227. Wetting-Dewetting Transition Line in Thin Polystyrene Films
Published: Date unknown
Authors: K M. Ashley, D T Raghavan, Jack F Douglas, Alamgir Karim
Abstract: Thin polymeric films are increasingly being utilized in diverse technological applications and it is crucial to have a reliable method to characterize the stability of these films against dewetting. The parameter space that influences the dewetting ...

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