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Search Publications by: Kalman Migler (Fed)

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Displaying 76 - 100 of 214

Carbon Nanotubes: Measuring Dispersion and Length

August 26, 2010
Author(s)
Jeffrey A. Fagan, Barry J. Bauer, Erik K. Hobbie, Matthew Becker, Angela R. Hight Walker, Jeffrey R. Simpson, Jae H. Chun, Jan Obrzut, Vardhan Bajpai, Frederick R. Phelan Jr., Daneesh O. Simien, JiYeon Huh, Kalman D. Migler
Advanced technological uses of single-wall carbon nanotubes (SWCNTs) rely on the production of single length and chirality populations that are currently only available through liquid phase post processing. The foundation of all of these processing steps

Forced Assembly and Mixing of Melts via Planar Polymer Micro-Mixing

June 24, 2010
Author(s)
Doyoung Moon, Kalman D. Migler
The ability to force immiscible polymers into specific, targeted structures would enable the generation of blends with tailored performance by exploiting the intimate relationship between structure and blend properties. Here we present a strategy for the

MEMS Parallel Plate Rheometer for Oscillatory Shear Micro Rheology Measurements

December 11, 2009
Author(s)
Gordon Christopher, Nicholas G. Dagalakis, Steven D. Hudson, Kalman D. Migler
Growing numbers of applications including proteomics, cosmetics, and thin film coatings use novel viscoelastic materials that derive their rheological properties from micro scale structure created by the inclusion of long chain molecules, nano particles

Microfluidic Mixer for Polymer Melts

June 22, 2009
Author(s)
Doyoung Moon, Kalman D. Migler
We present a novel microfluidic mixer for high temperature polymer melts based on the platform of the Multi-sample Micro-slit Rheometer (MMR). The device is essentially a static mixer with eight consecutive units of splitting and recombination flow formed

A Description of the Fluoroelastomer Coating Evolution as a Polymer Processing Aid

October 16, 2008
Author(s)
Mathurin G. Meillon, D Morgan, D Bigio, Kalman Migler, S Oriani
For decades, fluoroelastomers have been used as polymer processing aids (PPA). Previous works have measured the thickness of the PPA coating, its effects on the polymer/die interface, and proposed several mechanisms of PPA coating. In this work, the

A Multi-Sample Melt Micro-Rheometer

October 16, 2008
Author(s)
Anthony J. Bur, Kalman Migler
A slit micro-rheometer that is used for simultaneous measurement of melt viscosities of four samples has been developed. Sample size is less than 100 mg. The driving force for the rheometer is gas pressure from a nitrogen tank that forces polymer melt into

In-Situ Visualization of Novel Polymer Droplet Morphologies During Extrusion

October 16, 2008
Author(s)
Erik K. Hobbie, Kalman Migler
We report the observation of novel droplet morphologies in the high stress layers near the walls of a specially instrumented slit die. We utilize in-situ optical microscopy to study a dilute blend of polystyrene (PS) in a polyethylene (PE) matrix. At low

Measurement of Slippage Induced by a Polymer Processing Additive

October 16, 2008
Author(s)
Kalman Migler, C L. Gettinger, V P. Thlacker, R Conway
Flow profiles of a linear density polyethylene (LLDPE) were measured in an optical slit die situated at the exit of a twin screw extruder. The velocities of tracer particles were measured as a function of position across the slit die at various flow rates