NOPR Collection:

Surface Studies on Polyacrylonitrile Yarn by X.P.S. (ESCA)*

Tue, 01 Sep 1981 00:00:00 GMT

Title: Surface Studies on Polyacrylonitrile Yarn by X.P.S. (ESCA)* Authors: Chand, Navin Abstract: The surface of stapled polyacrylonitrile (PAN) yarn has been studied through ESCA (XPS). The structure at the surface and the change in half width of C_1s spectra of the yarn has been discussed. Page(s): 133-134

Effect of Storage on Wool Quality: Part I-Tensile and Bulk Resiliency Behaviour of Stored Wool Fibres

Tue, 01 Sep 1981 00:00:00 GMT

Title: Effect of Storage on Wool Quality: Part I-Tensile and Bulk Resiliency Behaviour of Stored Wool Fibres Authors: Malhi, R S; Patni, P C; Bapna, D L; Arora, R K; Singh, V P Abstract: The results of a study conducted to see the effect of 24 months' storage on the fibre tenacity and bulk resiliency behaviors of Rambouillet, Rambouillet (50%) × Chokla (50%), Chokla and Malpura wools of spring and autumn clips in raw and scoured form are reported. It is observed that the tensile and bulk resiliency behaviors’ of the stored wool fibres do not exhibit significant variation under the prevailing conditions of atmospheric temperature and relative humidity, except in a few cases. Page(s): 129-132

End-Use Performance of Some Indian and Crossbred Sheep Wools

Tue, 01 Sep 1981 00:00:00 GMT

Title: End-Use Performance of Some Indian and Crossbred Sheep Wools Authors: Patni, P C; Pokharna, A K; Bapna, D L; Parthasarathy, S; Mathur, J P; Arora, R K; Malhi, R S; Singh, V P Abstract: Fibre and fabric characteristics of Rambouillet and Merino crosses with Chokla and Nali, Chokla and Corriedale sheep wools are reported. Crossbreeding improves the fiber fineness and reduces the percentage medullation and length. The reduction in fibre length increases the noil extraction. Fabrics produced from crossbred sheep wools are better in terms of feel, visual appeal, etc. The presence of hetero and hairy fibres in halfbred wools imparts a rough feel and uneven surface appearance due to differential dye uptake. Page(s): 124-128

Water Soluble Cellulose Acetate and Its Application

Tue, 01 Sep 1981 00:00:00 GMT

Title: Water Soluble Cellulose Acetate and Its Application Authors: Mukherjee, K; Agarwal, R K; Chaturvedi, H K; Gupta, B D Abstract: Qualitative filter grade cellulose was acetylated using acetic anhydride and sulphuric acid, and the product was hydrolysed with dilute acetic acid using sulphuric acid or sodium acetate as the catalyst for hydrolysis. The acetyl content decreased continuously on increasing the duration of hydrolysis with sulphuric acid as the catalyst. The product was initially soluble in acetone, the solubility decreasing with decrease in acetyl content, and the product finally becoming insoluble. However, with acetyl content in the range 18-20% the product became water soluble. On increasing the temperature of hydrolysis, the rate of hydrolysis increased. The system with sodium acetate as the catalyst for hydrolysis showed the same trend. However, the water soluble product could not be obtained with sodium acetate as the catalyst. The water soluble product was evaluated for application as a size for cotton yarns and the results were compared with those for starch and polyvinyl alcohol In general, water-soluble cellulose acetate had tensile and flex abrasion properties intermediate between those of starch and polyvinyl alcohol However, its ease of removal by water treatment is highest of the three sizes. Page(s): 120-123