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Modeling of Microencapsulated Polymer Shell Solidification

Published online by Cambridge University Press:  15 February 2011

Travis Boone ,
Lisa Cheung ,
Donald Nelson ,
David Soane ,
Gerald Wilemski  and
Robert Cook
Travis Boone
Affiliation:
Soane Technologies, Inc., Hayward, CA 94545
Lisa Cheung
Affiliation:
Soane Technologies, Inc., Hayward, CA 94545
Donald Nelson
Affiliation:
Soane Technologies, Inc., Hayward, CA 94545
David Soane
Affiliation:
Soane Technologies, Inc., Hayward, CA 94545
Gerald Wilemski
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551
Robert Cook
Affiliation:
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551
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Abstract

A finite element transport model has been developed and implemented to complement experimental efforts to improve the quality of ICF target shells produced via controlled-mass microencapsulation. The model provides an efficient means to explore the effect of processing variables on the dynamics of shell dimensions, concentricity, and phase behavior. Comparisons with experiments showed that the model successfully predicts the evolution of wall thinning and core/wall density differences. The model was used to efficiently explore and identify initial wall compositions and processing temperatures which resulted in concentricity improvements from 65 to 99%. The evolution of trace amounts of water entering into the shell wall was also tracked in the simulations. Comparisons with phase envelope estimations from modified UNIFAP calculations suggest that the water content trajectory approaches the two-phase region where vacuole formation via microphase separation may occur.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 372: Symposium W1 – Hollow and Solid Spheres and Microspheres--Science and Technology , 1994 , 193
Copyright
Copyright © Materials Research Society 1995

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