1998 / Solid Freeform Fabrication Proceedings
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Author J. S. Ullett (a) T Benson-Tolle (c),. J.W. Schultz (b), R. P. Chartoff (a), (a) University of Dayton, (b) Georgia Tech Research Institute, (c) United States Air Force Materials Directorate
Source Solid Freeform Fabrication Proceedings, 1998, pp 519-528
Abstract Liquid crystal (LC) resins are a new kind of stereolithography material that can produce parts with structured or ordered morphologies instead of the amorphous morphologies that result from standard resins. The LC molecules can be aligned before cure resulting in an anisotropic crosslinked network when the laser induced polymerization "locks-in" the alignment. Previous papers have explored liquid crystal orientation dynamics, the effects of orientation on visco- elastic and mechanical properties, and the processing of LC resins by stereolithography. This paper considers the effects of morphology on fracture toughness and thermal-expansion properties. Both toughness and thermal-stability continue to be important issues for stereolithography parts. The use of LC resins may provide a way to significantly improve performance in both of these areas, and in addition result in parts with high upper use temperatures. (Auth abstract) [References: 5]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
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Mechanical Engineering Dept.
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