1998 / Solid Freeform Fabrication Proceedings
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Author R. P. Chartoff (a), J. W. Schultz (b), J. Bhatt (c), J. S. Ullett (a), (a) University of Dayton, (b) Georgia Tech Research Institute, (c) Polaroid Corporation
Source Solid Freeform Fabrication Proceedings, 1998, pp 737-744
Abstract A liquid crystal monomer has been developed that contains both acrylate and acetylene reactive groups. The curing behavior and mechanical properties of the polymers formed from this monomer have been characterized in this study. Complete cure can be carried out in two separate steps, combining both photo and thermal polymerization. The initial photo- polymerization to form a robust "green" polymer involves crosslinking through the acrylate groups and the subsequent thermal polymerization to increase the crosslink density is accomplished by reaction of the acetylene groups. After the thermal postcure the polymer has an unusually high glass transition, in excess of 300 deg C. In addition, the monomer exhibits an ordered liquid crystalline (LC) phase. Photopolymerization while in the LC phase locks in the molecular ordering. Mechanical property data and additional information on curing in both the isotropic and LC phases are reviewed in the following presentation. (Auth abstract) [References: 9]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
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