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Crosslinking of Cotton Cellulose in the Presence of Alpha-Amino Acids

Two kinds of alpha-amino acids are used to combine with dimethylol-dihydroxyethyleneurea (DMDHEU) as crosslinking agents, and the specific rate constants and other activation parameters are discussed. From the results, we find that the rate constants for the various crosslinking agent systems are in the order of DMDHEU > DMDHEU-aspartic acid > DMDHEU-glutamic acid. The energies needed to crosslink are in the rank of DMDHEU-glutamic acid > DMDHEU-aspartic acid > DMDHEU. The values of enthalpy and entropy for DMDHEU are lower than those for DMDHEU-alpha-amino acids, and enthalpy values for DMDHEU are significantly lower than those for DMDHEU-alpha-amino acids. The data of various activation parameters reveal that the reaction state of DMDHEU-alpha-amino acids is different from that of DMDHEU. Additionally, the reactions between aluminum sulfate and aspartic acid are confirmed by infrared spectra.