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Morphological control of inter-penetrating polymer networksSynthetic organic polymer chemistry has been successful in producing composition of matter with thermal oxidation stability and progressively higher glass transition temperatures. In part, this was done by increasing the steric-hindrance of moieties in the chain of a macromolecule. The resulting polymers are usually quite insoluble and produce molten polymers of very high viscosities. These types of polymers are not easily processed into graphite fiber prepregs by melt or solution impregnation methods. Hence, a technological need exists to produce new knowledge of how to produce polymer-fiber composites from this class of polymers. The concept of freeze drying amic-acid prepolymers with reactive thermoplastic was proposed as a research topic for the ASEE/NASA Summer Faculty Program of 1989 as a means of producing polymer-fiber composites. This process scheme has the thermodynamic attribute that the magnitude of phase separation due to differences in solubility of two organic constituents in solution will be greatly reduced by removing a solvent not by evaporation but by sublimation. Progress to date on evaluating this polymer processing concept is briefly outlined.
Document ID
19900015730
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hansen, Marion
(Tennessee Univ. Knoxville, TN, United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1989
Publication Information
Publication: Old Dominion Univ., NASA/American Society for Engineering Educati
Subject Category
Nonmetallic Materials
Accession Number
90N25046
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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