NOPR Collection:

Synthesis of Propargyl Cellulose

2016-07-20T06:21:12Z

Title: Synthesis of Propargyl Cellulose Authors: Bhatt, I G; Iyer, V; Sundaram, V Abstract: Propargyl cellulose has been synthesized by the allylation of cellulose followed by bromination and subsequent dehy-drobromination with potassium tert-butoxide in dimethyl sulphoxide. Page(s): 43-44

Measurement of Refractive Indices of Polypropylene Fibre by Back-scattering Techniques

2016-07-20T06:20:08Z

Title: Measurement of Refractive Indices of Polypropylene Fibre by Back-scattering Techniques Authors: Fouda, I M; Hamza, A A; El-Farhaty, K A Abstract: A sensitive and non-destructive method based on back-scattering technique has been applied for measuring the mean values of the perpendicular refractive indices of polypropylene fibers. The values obtained are in close agreement with those obtained by other methods. Page(s): 40-42

DTA and IR Studies on Cellobiose Treated with Phosphorus Oxychloride-N, N-Dimethylformamide Mixture

2016-07-20T06:19:29Z

Title: DTA and IR Studies on Cellobiose Treated with Phosphorus Oxychloride-N, N-Dimethylformamide Mixture Authors: Bhatnagar, Satish; Agnish, S L; Bhatnagar, Hari L Abstract: Phosphorylation of cellobiose, a basic unit of cellulose, was carried out in a mixture of N, N-dimethylformamide and phosphorus oxychloride at different temperatures in the range 40-80°C and the products of the reaction were subjected to DTA studies. The thermograrns show an endothermic activity in the region 170-230°C in air. The single endotherm at 200°C in air has been found to be shifted to 180°C in nitrogen atmosphere. This lowering of the peak temperature is attributed to the effect of synergism of nitrogen gas in combination with phosphorus present in the phosphorylated products of cellobiose. The IR spectra of the residues, obtained after partial or complete charring of the phosphorylated products in the vicinity of 180°C, together with elemental analyses provide evidence of dehydration attributable to O - H and C - H stretching in the region 3400-2880 cm^-1. Page(s): 37-39

Studies in Reactive Dyes: Part IV-Halo Aromatic Amines in Reactive Azoic Dyeing of Cotton and Wool

2016-07-20T06:18:24Z

Title: Studies in Reactive Dyes: Part IV-Halo Aromatic Amines in Reactive Azoic Dyeing of Cotton and Wool Authors: Shah, N H; Patel, B K; Upasani, C B Abstract: Two reactive coupling components, 2,4-dichloro-6-(4'-hydroxy-1'-naphthyl)-s-triazine and 2,4-dichloro-6-(4'-hydroxy-1'-anthracenyl)-s-triazine, were synthesized and impregnated on cotton and wool. The fibres were developed with 15 halo aromatic amines and the effect of halogen on fastness properties, viz. washing, rubbing and light, was studied. The absorption spectra of dissolved dyed fibre in the visible region are reported. All the halo aromatic amines used produce attractive shades varying from orange to violet, on both cotton and wool. Comparison of shades and fastness properties with those obtained with aniline shows very little change in shade and no change in washing fastness. Contrary to the expectation, halo aromatic amines lower the light fastness in reactive azoic dyeing. For cotton fibres, rubbing fastness remains unaltered, while wool fibres show some increase. The introduction of halogen in aromatic amine shifts λ_maxvalue to a lower wavelength as compared to aniline. Page(s): 33-36