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You searched on: Topic Area: Materials Science

Displaying records 311 to 320 of 420 records.
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311. Dielectric Spectroscopy Investigation of Relaxation in C60-Polyisoprene Nanocomposites
Topic: Materials Science
Published: 3/23/2009
Authors: Yifu Ding, Sebastian Pawlus, Alexei Sokolov, Jack F Douglas, Alamgir Karim, Christopher Soles
Abstract: We investigate the influence of adding C60 nanoparticles on the dielectric relaxation spectra of both unentangled and entangled polyisoprene (PIP). Relaxation modes corresponding to both segmental and chain relaxation were analyzed over a broad tempe ...

312. Examination of thin film modulus for a series of poly(alkyl methacrylates)
Topic: Materials Science
Published: 3/22/2009
Authors: Jessica M. Torres, Christopher M Stafford, Bryan D. Vogt
Abstract: In this work, the modulus of polymer thin films for a homologous series of poly(n-alkyl methacrylate)s will be discussed. In particular, the impact of the degree of undercooling from bulk Tg on the deviations will be explored as Tg is significantly ...

313. Quantifying Residual Stress in Nanoscale Thin Polymer Films via Surface Wrinkling
Topic: Materials Science
Published: 3/19/2009
Authors: Jun Y. Chung, Thomas Q. Chastek, Michael J Fasolka, Hyun Wook Ro, Christopher M Stafford
Abstract: Residual stress, a pervasive consequence of solid materials processing, is stress that remains in a material after external forces have been removed. In polymeric materials, residual stress results from processes, such as film formation, that force ...

314. Measuring Photocatalytic Response of Metal Oxide Fillers in Polymeric Films Using Electron Paramagnetic Resonance Spectroscopy
Topic: Materials Science
Published: 3/18/2009
Authors: Stephanie S Watson, I-Hsiang Tseng
Abstract: Metal oxide fillers, such as titanium dioxide (TiO2), are heavily utilized in polymeric coatings and plastics for opacification, pigmentation, and mechanical enhancement. It is well known that the photoreactivity of TiO2 can contribute to the degrada ...

315. Polymerization Stress Development in Dental Composites: Effect of Cavity Design Factor
Topic: Materials Science
Published: 3/13/2009
Authors: Joseph M Antonucci, Anthony Albert Giuseppetti, Justin N.R. O'Donnell, Gary Edward Schumacher, Drago Skrtic
Abstract: Objective: To assess the effect of the cavity design factor (C-factor) on polymerization stress development (PSD) in resin composites. Methods: An experimental resin (BT resin) was prepared, which contained 2,2-bis[p-(2 hydroxy-3 -methacryloxypropoxy ...

316. Measurement of Dynamic Capillary Pressure and Viscosity via the Multi-Sample Micro-Slit Rheometer
Topic: Materials Science
Published: 3/6/2009
Authors: Doyoung Moon, Kalman D Migler
Abstract: We develop two direct methods to simultaneously measure the dynamic capillary pressure and the viscosity of fluids by application of differential forces during flow into micro-channels. In the first method, a series of external pressures is applied ...

317. The molecular basis of mesophase ordering in a thiophene-based copolymer
Topic: Materials Science
Published: 2/18/2009
Authors: Dean M DeLongchamp, Regis J Kline, Youngsuk Jung, Eric K Lin, Daniel A Fischer, David J Gundlach, Andrew Moad, Lee J Richter, Michael F. Toney, Martin Heeney, Iain McCulloch
Abstract: The carrier mobility of poly(2,5-bis(3-alkylthiophen-2-yl) thieno[3,2-b]thiophene) semiconductors can be substantially enhanced after heating through a thermotropic mesophase transition, which causes a significant improvement in thin film structural ...

318. High-throughput measurements of viscoelastic properties using surface indentation
Topic: Materials Science
Published: 2/15/2009
Authors: Peter M. Johnson, Christopher M Stafford
Abstract: Relaxation processes in viscous liquids and glasses have been studied extensively, but the underlying causes of glassy behavior in polymeric systems remains as a major unsolved area of condensed matter physics. These processes are critical in the de ...

319. Ultrathin Adhesives: Confinement Effect on Modulus
Topic: Materials Science
Published: 2/15/2009
Authors: Jessica M. Torres, Christopher M Stafford, Bryan D. Vogt
Abstract: In this work, we will employ this wrinkling metrology to extract the modulus of polymer thin films for a homologous series of poly(n-alkyl methacrylate)s. In particular, we take advantage of the decrease in Tg as the alkyl chain length increases for ...

320. Effect of specimen orientation and extrusion welds on the fatigue life of an AA6063 alloy
Topic: Materials Science
Published: 2/13/2009
Author: Nicholas Nanninga
Abstract: The effect of specimen orientation and extrusion seam welds on the fatigue life of specimens milled from a hollow AA6063 alloy extrusion profile have been characterized in the form of S-N curves. The fatigue behavior of the fully recrystallized AA60 ...

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