Swelling characteristics of gel fractions of formaldehyde-modified cotton celluloses

Authors

  • Samuel M. Stark Jr.,

    1. Southern Regional Research Laboratory, Southern Utilization Research and Development Division, Agricultural Research Service, U.S. Department of Agriculture, New Orleans, Louisiana 70119
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  • Stanley P. Rowland

    1. Southern Regional Research Laboratory, Southern Utilization Research and Development Division, Agricultural Research Service, U.S. Department of Agriculture, New Orleans, Louisiana 70119
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  • Presented in part at the Spring Meeting of The Fiber Society at Williamsburg, Va., May 1966.

Abstract

A method for assessing extent of swelling of the gel fraction of formaldehyde-modified cottons, employing cupriethylenediamine hydroxide as the swelling agent, is described. Substantial differences in apparent specific volumes of swollen gel fractions are observed for cottons crosslinked by different processes to the same level of agent. The apparent crosslink density measured by the swelling of gel fraction increases with formaldehyde content of the cotton; at 0.20% formaldehyde the order of increasing crosslink density in the various processes of reaction is as follows: nonaqueous system (forms D and D′) < aqueous system (forms W and W′) <swelling system (form F) < vapor system (form V) < bake-cure system (form C).

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