Abstract
The present paper deals with three different kinds of light microscopical techniques which can be used successfully for the purpose of investigating acrylic fibers:(1) Phase contrast microscope.(2) Basic dye (Victoria Blue) staining.(3) Sandocryl (Sandocryl Black) staining.Several results obtained from a variety of commercial acrylic fibers are presented for illustration. See the figures in the text. In every figure three sheets of photomicrograph are arranged in the same order from left to right: (1) phase contrast picture, (2) Victoria Blue staining, and (3) Sandocryl Black staining. The magnification is fixed to. ca. 500 diameters throughout all figures.The phase contrast microscopy might be potentially used in combination with an electron microscopical study on ultrathin sections.The basic dye staining procedure is not only effective in revealing structural details of acrylic fibers under observation, but also will be of importamce in respect to providing informations about practical dyeability.Sandocryl staining should be remarked on its specificity against acrylic fibers, where copper (I) complex salt formation is involved. The two-component structure of Orlon 21 is demonstrated in a clearest manner.
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