Highlighting a Cotton Grafting Process Using the Spectral Subtraction Method and Statistical Analysis

Abstract

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.

Effect of Unmodified and Modified Nanocrystalline Cellulose Reinforced Polylactic Acid (PLA) Polymer Prepared by Solvent Casting Method Morphology, mechanical and thermal properties

“…The tensile strength of the neat Crystallinity analysis XRD analysis was used in order to determine the effect of acetylation reaction towards the crystallinity index of nanocrystalline cellulose, and the diffraction pattern was given in figure 5. As mentioned by Santos et al [15], diffractogram which exhibit an amorphous broad hump and sharp crystalline peak is acknowledged that both nanomaterial is in semi-crystalline form. The diffractogram of uNC showed in figure 5(a) was exhibited by type I cellulose with an amorphous broad hump and sharp crystalline peak of cellulose.…”

“…According to Yan et al [13], the appearance of these three main peaks identifies that the acetylation reaction has been successfully covert the unmodified nanocrystalline cellulose to acetylated nanocrystalline cellulose. of peak at 2θ=14.8° (plane 101), 2θ=16.6° (plane 10î), a sharp peak at 2θ=22.9° (plane 002) and small broad peak at 2θ=34.3 o (plane 004) [15]. Almost similar major reflection peak appear after an acetylation reaction at 2θ=14.4 o , 2θ=16.4 o , 2θ=22.8 o and 2θ=34.5°.This is similar with the result reported by Jonoobi et al [6] which highlighted that there is no changes in main diffraction pattern even after experience the chemical modification.…”

“…Almost similar major reflection peak appear after an acetylation reaction at 2θ=14.4 o , 2θ=16.4 o , 2θ=22.8 o and 2θ=34.5°.This is similar with the result reported by Jonoobi et al [6] which highlighted that there is no changes in main diffraction pattern even after experience the chemical modification. Except for the appearance of new small broad hump around 2θ=20.0° for aNC sample attributes to the presence of grafted aliphatic chains which considering the acetylation reaction has partially converted the cellulose type I into cellulose type II [14][15][16]. The Crystallinity index was calculated using Segal method and intensity of both samples has been summarized in table 2.…”

Synthesis, Characterization and Thermal Degradation of Some New 3,5-dimethyl Pyrazole Derivatives

“…Ar-O band is between 3586 -3754 cm -1 and in the case of S-N rings is between1672 -1790 cm -1 . The band of valency vibration for C-N is at 1200 -1242 cm -1 being a very intense one [30][31][32][33].…”

Flexible Acrylate Dentures versus Chromium Cobalt Removable Partial Dentures - a Viable Therapeutical Solution

“…It also matches the color of the tooth and the color of the gingival tissue, has low weight and heat resistance [19][20][21][22][23]. There is a small number of papers in the literature on the efficacy * email: raluca_baciu2002@yahoo.com; zanaamaseluta@yahoo.com; ioanamartu@yahoo.com of this material as a substitute for the chromium-cobalt alloy and it needs testing in different clinical situations to allow for universal acceptance [24].…”