الفهرس 
Chemical mdification of cotton
Novel application of partial carboxymethylation in the wet processing of cotton fabricsOnly 14 pages are availabe for public view
 |  | from | 127 |  |  |
| | | from | 127 | | |
Abstract
A novel application of partial carboxymethylation of cotton fabrics in the wet processing was introduced with the primary objective of reducing the number of the conventional operations involved in the wet processing.
For this purpose partial carboxymethylation was carried out on scoured cotton with two methods. In the first method cotton fabrics were padded with chloroacetic acid and sodium hydroxide successively, then stored at room temperature followed by a thorough washing. The second method consists of padding the cotton fabrics with chloroacetic acid, drying at room temperature and then padding with sodium hydroxide followed by storing at ambient temperature. It is advantageous to use the second method since lower concentration of chloroacetic acid and sodium hydroxides were used.
The effect of partial carboxymethylation on some physical and chemical structure owing to partial carboxymethylation were assessed by measuring copper number, carboxy1 group and degree of polymerization whereas changes in the physical structure were assessed by tensile strength and elongation at break. Furthermore, the influence of partial carboxymethylation on total size, ash content, moisture regain and wettability was investigated.
The behavior of partially carboxymethylated cotton having different carboxymethy1 contents to bleaching with sodium chlorite and hypochlorite was investigated, the susceptibility of the modified cellulose towards dyeing with fibber- reactive dyes and resin finishing was addition ally studied.
The most important findings arrived at from these studies are summarized below.
Effect of partial carboxymethylation on some chemical and physical properties of cotton fabric total size
Treatment of scoured cotton with sodium hydroxide caused a considerable decrease in the total size on the fabric. This is associated with the partial oxidation of starch (sizing material) under the catalytic influences of alkali in presence of oxygen.
Further reduction in the total size is achieved with partial carboxymethylation of cotton, indicating simultaneous partial carboxymethylation of starch which yields an easily water soluble product.