NASA NTRS · 19930000252
Freeze-Drying Makes Improved IPN And Semi-IPN Polymers
Abstract
Novel 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.
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Pater, Ruth H., Smith, Ricky E., Razon, Ruperto T., Hansen, Marion G., Hsiung, Hahn J., Soucek, Mark D.. 1993-05-01. Freeze-Drying Makes Improved IPN And Semi-IPN Polymers. https://ntrs.nasa.gov/citations/19930000252
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