Reaction products of diethylaminoethyl (DEAE)-cotton with epichlorohydrin in both protic and aprotic solvents, have been examined in the electron microscope. Evaluation of degree of cross-linking and uniformity of reaction was made on the basis of expansion patterns obtained by polymerization of methacrylate within the fibers treated in the various solvents. In general, fiber structures from the aprotic systems appeared to be more homogeneous and solid than those from the protic media.
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