NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Polymer solution phase separation: Microgravity simulationIn many multicomponent systems, a transition from a single phase of uniform composition to a multiphase state with separated regions of different composition can be induced by changes in temperature and shear. The density difference between the phase and thermal and/or shear gradients within the system results in buoyancy driven convection. These differences affect kinetics of the phase separation if the system has a sufficiently low viscosity. This investigation presents more preliminary developments of a theoretical model in order to describe effects of the buoyancy driven convection in phase separation kinetics. Polymer solutions were employed as model systems because of the ease with which density differences can be systematically varied and because of the importance of phase separation in the processing and properties of polymeric materials. The results indicate that the kinetics of the phase separation can be performed viscometrically using laser light scattering as a principle means of following the process quantitatively. Isopycnic polymer solutions were used to determine the viscosity and density difference limits for polymer phase separation.
Document ID
19900007785
Document Type
Conference Paper
Authors
Cerny, Lawrence C. (Utica Coll. NY., United States)
Sutter, James K. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1989
Publication Information
Publication: NASA Laser Light Scattering Advanced Technology Development Workshop, 1988
Subject Category
NONMETALLIC MATERIALS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Document Inquiry