A New Method of Impregnating PEl Sheets for the In-Situ Foaming of Sandwiches

Book (1998)
Faculty
Aerospace Engineering (Aerospace Engineering) (TU Delft)
Copyright: © 1998 Faculty of Aerospace Engineering, TU Delft
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Published Date

31-12-1998

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Source:

Series 07, Aerospace Materials 07

Faculty

Aerospace Engineering

Abstract

A new method is described to make foamable films for the production of in-situ foamed sandwiches. The method consists of placing a polymer film in a bath with a swelling agent and, when equilibrium swelling has been reached, placing the film in a bath with a second liquid. If the liquids are miscible the swelling agent in the film will be replaced by the second liquid. The polymer used for the research described in this report was polyetherimide and the swelling agent was acetone. Sandwiches were produced with the fomable films made in th is manner using ethanol, 1,1,1- trichloroethane and water as blowing agents. Some mechanical properties of these sandwiches were tested.

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