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Freeze-Drying Makes Improved IPN And Semi-IPN PolymersNovel process developed for production of interpenetrating polymer networks (IPN's) or semi-IPN's with greater fracture toughness and resistance to microcracks. Process controls degree of phase separation in IPN's. In experiment, IPN's and semi-IPN's formed by dissolving constituents in another common solvent in traditional method. Resins and composite materials produced were tested for both traditional and freeze-drying processes. Glass-transition temperatures and data from dynamic mechanical tests of freeze-dried IPN's and semi-IPN's demonstrated freeze-drying process provided much improved IPN's and semi-IPN's.
Document ID
19930000252
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
Pater, Ruth H.
(NASA Langley Research Center, Hampton, VA.)
Smith, Ricky E.
(NASA Langley Research Center, Hampton, VA.)
Razon, Ruperto T.
(NASA Langley Research Center, Hampton, VA.)
Hansen, Marion G.
(Tennessee Univ.)
Hsiung, Hahn J.
(Tennessee Univ.)
Soucek, Mark D.
(National Research Council)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: NASA Tech Briefs
Volume: 17
Issue: 5
ISSN: 0145-319X
Subject Category
Materials
Report/Patent Number
LAR-14677
Accession Number
93B10252
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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