During a study on the structure of cured epoxy resins, considerable difficulty was experienced in preparing samples for infrared analysis. The use of solvents was impractical. Granulation by means of a <i>"Wig-L-Bug"</i> proved unsatisfactory; apparently, the natural elasticity prevented reduction of the resin to a sufficiently fine powder. The particles produced by scraping or similar techniques were also too large and produced erroneous results, especially at the shorter wavelengths. Curve <i>A</i> in Figure 1 is typical of results obtained using samples prepared under these conditions. It was also found difficult to cast satisfactory thin films. Even the thinnest films (less than 0.002 in. thick) were virtually opaque in the infrared region; this is illustrated by curve <i>B</i> in Figure 1. The use of smears or the resin without hardener was not acceptable because such conditions fell outside the limits of the problem as it was defined.
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