scholarly journals The Improving properties of Viscose fabric by water repellent finish

2021 ◽  
Vol 4 (1) ◽  
pp. first
Author(s):  
Hue Thi Kim Trinh ◽  
Mai Hương Bùi
Keyword(s):  
Sodium Hydroxide ◽  
Cellulose Xanthate ◽  
Aqueous Sodium Hydroxide ◽  
Viscose Fiber ◽  
Population Increase ◽  
Water Repellent ◽  
Wet Strength ◽  
Aqueous Sodium ◽  
Alkali Cellulose ◽  
Medical Hygiene

Viscose as cellulosic origin, the cheapest of all cellulosic fabrics could be the best alternative. Viscose is manufactured from regenerated cellulose. In order to manufacture viscose, pulp of bamboo is treated with aqueous sodium hydroxide to form alkali cellulose. This alkali cellulose is then treated with carbon disulfide to form sodium cellulose xanthate. The xanthate is then dissolved in aqueous sodium hydroxide and allowed to depolymerize. After depolymerization, rayon fiber is produced from the ripened solution. Viscose is primarily employed in apparels, upholstery fabric, industrial clothing, and medical hygiene. Apparels, upholstery fabric, and industrial clothing segments account for key share of the viscose market. The medical hygiene segment is anticipated to expand during the forecast period. Demand for viscose fiber is anticipated to increase significantly in the near future due to the rise in global population, increase in standard of living, and growth in disposable income. Viscose is an eco-friendly product; thus, increase in awareness about eco-friendly products and decrease in production of cotton are estimated to augment the demand for viscose fiber. Viscose fabric exhibits some similar properties compared to cotton except its poor wet strength due to higher moisture regain. In this study, chemical finishes by different cross-linkers were applied to improve the wet strength of the viscose fabric. For this purpose, water repellent finishes were applied. Water repellent finish helped in reducing the molecular barrier around the individual fibres that lowered the surface tension of the fabric. It reduces the absorbency of viscose fabric hence leads to higher wet strength. Therefore, the treated viscose fabric exhibited better wet strength after applying water repellent finishes on it. Scanning electron microscope (SEM) was used to examine the surface of the fabric treated with chemicals. Tensile strength of viscose was increased 24.6%.

THE DIVERGENT BEHAVIOR OF THE HYDROXIDES OF LITHIUM, SODIUM, AND OF POTASSIUM, RUBIDIUM, AND CESIUM IN THE XANTHATION OF CELLULOSE AND STARCH

1957 ◽  
Vol 35 (9) ◽  
pp. 960-968 ◽  
Author(s):  
E. G. Adamek ◽  
C. B. Purves
Keyword(s):  
Sodium Hydroxide ◽  
Sulphuric Acid ◽  
Potassium Hydroxide ◽  
Carbon Disulphide ◽  
Cellulose Xanthate ◽  
Aqueous Sodium Hydroxide ◽  
Large Excess ◽  
Sodium Potassium ◽  
Aqueous Sodium ◽  
Divergent Behavior

When a suspension of cellulose, or a solution of starch, in 17.8% aqueous sodium hydroxide was shaken with a large excess of carbon disulphide, a sodium xanthate of degree of substitution (D.S.) about 0.4 was obtained. The replacement of the sodium hydroxide by 17.8% potassium hydroxide resulted in a product of D.S. about 1.3. Plots were made of the D.S. of cellulose xanthate resulting from the use of various concentrations of the hydroxides of lithium, sodium, potassium, rubidium, and cesium; the plots for the last three hydroxides were similar, and differed sharply in form from those of the first two.Potassium cellulose or starch xanthate of D.S. about unity was freely soluble in water as well as in aqueous alkalies and the solutions "ripened". When immersed in methyl iodide, the dry salts yielded the corresponding S-methyl xanthates without change in the D.S. These S-methyl xanthates were white substances insoluble in water but dissolved or dispersed by carbon disulphide. They could be acetylated with sulphuric acid as catalyst and without change in the S-methyl xanthate D.S. The acetylated cellulose derivative was freely dispersed by chloroform or trichloroethylene.

scholarly journals Triple Helix of Scleroglucan in Dilute Aqueous Sodium Hydroxide

1981 ◽  
Vol 13 (12) ◽  
pp. 1135-1143 ◽  
Author(s):  
Toshio Yanaki ◽  
Takemasa Kojima ◽  
Takashi Norisuye
Keyword(s):  
Sodium Hydroxide ◽  
Triple Helix ◽  
Aqueous Sodium Hydroxide ◽  
Aqueous Sodium

scholarly journals Studies on the Syntheses of Spiro-dienone Compounds. III. Photolysis of 2-Halogeno-N-ethyl-4'-hydroxybenzanilide in Aqueous Sodium Hydroxide

1973 ◽  
Vol 21 (12) ◽  
pp. 2679-2683 ◽  
Author(s):  
ZENICHI HORII ◽  
YOSHIHIKO NAKASHITA ◽  
KIMIKO KUNISAWA ◽  
CHUZO IWATA
Keyword(s):  
Sodium Hydroxide ◽  
Aqueous Sodium Hydroxide ◽  
Aqueous Sodium

Epimerization of reducing terminal groups of (1 → 2)-linked d-gluco- and d-manno-disaccharides in aqueous sodium hydroxide

1992 ◽  
Vol 229 (2) ◽  
pp. 369-375 ◽  
Author(s):  
Hidemitsu Kobayashi ◽  
Nobuyuki Shibata ◽  
Shigeko Konno ◽  
Kanehiko Hisamicha ◽  
Shigeo Suzuki
Keyword(s):  
Sodium Hydroxide ◽  
Aqueous Sodium Hydroxide ◽  
Aqueous Sodium
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