Network Formation in Cotton Cellulose Modified with Tris (1-aziridinyl) phosphine Oxide

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Abstract
Cotton cellulose modified with tris(1-aziridinyl)phosphine oxide (APO) at various levels of reaction was examined for network development (cross-link formation) by determination of the soluble (sol) and insoluble (gel) fractions in cupriethylenediamine hydroxide (Cuene), by observation of dissolution and swelling of thin cross sections in Cuene, and by measurement of the extent of swelling of the gel fraction in Cuene. The behavior of the APO-modified cotton cellulose is compared to that of cotton cross-linked with formaldehyde in a bake-cure process. Relatively low effectiveness of APO in developing a network structure in cotton cellulose is indicated by the results of this study. Mathematical analysis of the sol-gel data by means of the Charlesby-Pinner and Schultz equations leads to numerical estimates of the extent of Cuene-stable covalent bond formation between APO residues and the glucopyranosyl units of cotton cellulose; the results are in agreement (within a factor of two) with the results of organic component analysis reported in the preceding papers.