Freeze-drying for morphological control of high performance semi-interpenetrating polymer networks. IIIThe feasibility of using a freeze-drying (solvent removal by sublimation) approach for controlling the morphology of a high-performance semi-IPN is assessed. A high-performance thermoplastic polyimide and commercially available 4,4'-bismaleimide diphenylenemethane were dissolved in a solvent, 1,3,5-trioxane. The solvent was removed from the constituents by freeze-drying. For purposes of comparison, the constituents were dissolved in a high-boiling-point solvent, N,N-dimethylformamide. The solvent was removed from the solution by evaporation. The physical and mechanical properties and phase morphology of the neat resins and composites prepared by freeze-drying and traditional solution methods are presented and compared. It is concluded that the TG is higher and that the magnitude of minor constituent separation is less in the freeze-dry processed materials than for the processed solution.
Document ID
19920027591
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hsiung, H. J. (Tennessee Univ. Knoxville, TN, United States)
Hansen, M. G. (Tennessee, University Knoxville, United States)
Pater, R. H. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: International SAMPE Symposium and Exhibition