NOPR Collection:

Disperse Red 60 analogs

1999-12-01T00:00:00Z

Title: Disperse Red 60 analogs Authors: Ukponmwan, David O; Odilora, Chris A; Offor, Mercy N; Freeman, Harold S Abstract: The synthesis and properties of a series of Disperse Red 60 analogs containing substituents in the phenoxy moiety are described. While the introduction of substituents into the phenoxy ring does not result in a significant shift in the absorption maximum of the parent compound, most of the dyes synthesized afford better light fastness, wash fastness, crock fastness and sublimation fas tness. The structure of each dye has been confirmed by IR , ¹H NMR, 2-D NMR and mass spectrometric analyses. The mutagenic properties of these dyes have also been determined in the standard Ames test, using Salmonella typhimurium strains TA98 and TA100. The results indicate that all of the dyes are non-mutagenic. Some of the dyes are toxic towards strain TA100, with toxicity correlating well with partition coefficient values. Page(s): 297-302

Effect of degumming followed by sequential oxidative and reductive bleaching on mulberry and tasar silk fabrics

1999-12-01T00:00:00Z

Title: Effect of degumming followed by sequential oxidative and reductive bleaching on mulberry and tasar silk fabrics Authors: Sharma, I C; Chattopadhyay, D P; Mukhopadhyay, A; Boruah, R K; Vishwanath Abstract: The effect of degumming followed by sequential oxidative and reductive bleaching on physical properties, such as tenacity, thickness, fabric weight, bending length, crease recovery, flexural rigidity and air permeability, of mulberry and tasar silk fabrics has been studied. It is observed that tenacity, thickness, fabric weight, bending length, crease recovery and flexural rigidity decrease whereas air permeability increases after degumming and bleaching. Page(s): 290-293

Blend irregularity of air-jet textured yarns

1999-12-01T00:00:00Z

Title: Blend irregularity of air-jet textured yarns Authors: Rengasamy, R S; Sengupta, A K; Kothari, V K Abstract: A quantitative analysis of the blend irregularity of air-jet textured yarns is reported. The effects of raw material and process and nozzle parameters on the blend intimacy of air-jet textured yarns in a rotational pattern have been studied for the different blends of filament yarns. It has been established that the index of blend irregularity is closely associated with the yarn tension levels at the exit of the nozzle and in the mechanical stabilizing zone. Components of dissimilar fibre characteristics result in poor blend intimacy. Texturing in wet condition improves the blend intimacy. Blend regularity is influenced by the combination of type of texturing jet and raw materials used. Page(s): 233-241

Studies on formaldehyde-free crease-resistant finishing of cotton fabric using citric acid and selective chemical additives

1999-12-01T00:00:00Z

Title: Studies on formaldehyde-free crease-resistant finishing of cotton fabric using citric acid and selective chemical additives Authors: Chattopadhyay, D P; Sharma, D N; De, P Abstract: Crease recovery, strength retention and other physical properties of cotton fa brics cross linked with citric acid using different catalyst systems and additives have been studied. Sodium hypophosphite, disodium monohydrogen phosphate, sodium dihydrogen phosphate, sodium salt of maleic acid and sodium pyrophosphate were used as catalyst, and triethanolamine, triethanolamine hydrochloride and monoethanolamine were used as additives. It has been observed that ester crosslinking on cotton fabric using citric acid gives an overall better balanced properties in presence of sodium salt of maleic acid as catalyst and triethanolamine as additive. Use of sodium salt of maleic acid also reducces yellowing problem. Use of triethanolamine improves the whiteness and flex abrasion resistance of citric acid crosslinked cotton fabric. Page(s): 284-289