Spectral subtraction method was used to prove the grafting onto cotton fabrics of some derivatives of glyoxal with monochlorotriazinyl-β-cyclodextrin (MCT-β-CD). Glyoxal was initially brought in contact with HCl. The formed compound was brought in contact with MCT-β-CD, in presence of NaOH as catalyst. The resulted product was applied on cotton samples using the pad-dry-cure technology. The presence of MCTβ-CD on the final samples was confirmed by a spectroscopic analysis (spectral subtraction method) and the phenolphthalein test. Spectral subtraction method notifies any change between two (or more) FT-IR spectra. This method is very useful when the analyzed spectra are very similar and the classic FT-IR analysis fails to clearly highlight what is different between those 2 spectra, because the overlays are illegible. The grafting effects were confirmed by the increases of take-up degrees and wrinkle recovery angles (WRA). The WRA results were statistic analyzed with the standard deviation SD, the standard error of the mean (SEM) and the coefficient of variation (CV). The taking-up degrees considerably increased as compared to the reference samples, and the WRA values depend on the length and the flexibility of the product grafted on cotton.

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The dihydrated forms of the 40% glyoxal solution undergo a dehydration process (in the presence of HCl), when the proportion of non-hydrated glyoxal increases. In the presence of a dilute ethanol solution, the nonhydrated glyoxal generates a hemiacetal. The presence of hemiacetal is confirmed by FT-IR analysis by increasing of the peaks at 1053 cm -1 , 1107 cm -1 and by decreasing of the peak at 1746 cm -1 . The grafting of cotton with the final grafting agent obtained from the interaction of hemiacetal with MCT-β-CD, was possible using pad-dry-cure technology. The presence of MCT-β-CD on cotton fabric was confirmed by FT-IR analysis (by the peaks of 1535 cm -1 and 787 cm -1 ) and by the yellowing of the sample. Confirmation of the grafting is given both by increasing the pickup / take-up degrees and by increasing the wrinkle recovery angles (WRA). The statistical analysis of these indices indicates low values for standard deviation (SD), standard error of the mean (SEM) and the coefficient of variation (CV).