1998 / Solid Freeform Fabrication Proceedings
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Author Senol Pekin (a,b), John Bukowski (a), Avigdor Zangvil (a), (a) University of Illinois at U-C, (b) Argonne National Laboratory
Source Solid Freeform Fabrication Proceedings, 1998, pp 651-660
Abstract The binder removal schedule of a binder in the ethylene vinyl acetate-wax system was analyzed by automatically adjusting the soaking duration based on the monitored weight loss of the polymer. The thermolysis of several grades of microcrystalline wax and ethylene vinyl acetate have been analyzed by TGA and DSC to support the explanation of the weight loss rate controlled binder removal experiments. During the thermolysis of such binders in air, the degradation sequence is degradation and evaporation of hydrocarbons, degradation of the vinyl acetate, and degradation of the ethylene chain, all oxygen assisted. It was shown that the extent and the rate of the vinyl acetate degradation in air is determined by the molecular weight of the EVA, unlike its degradation in N2- It was concluded that thermolysis of light polymers is easier than that of the heavy ones and weight loss rate controlled binder removal technique can help in the optimization of binder removal schedule for a variety of polymers. (Auth abstract) [References: 19]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
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