Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Autex Research Journal

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Comparative investigations on the efficiency of different anchoring chemicals for the permanent finishing of cotton with chitosan

Sharaf S., Opwis K., Knittel D., Gutmann J. S.

Autex Research Journal

2011

Vol. 11, no. 2

71--77

Comparative studies on the efficiency of anchor molecules for the finishing of cotton with chitosan are presented. Four different anchors were used: cyanuric chloride (CNC), butane-1,2,3,4-tetracarboxylic acid (BTCA), glycidyloxypropyltrimethoxysilane (GPTMS) and sodium hydroxydichlorotriazine (Na-HDCT). Two types of chitosan with different molecular weights were used. The type of anchor used for fixation of chitosan on cotton fabric had a distinct effect on the antimicrobial efficiency of chitosan. By using increasing the concentration of anchor chemicals, the ability of chitosan to inhibit the growth of bacteria increased. Using GPTMS as an anchor for chitosan improved the ion binding capacity for Cu2+-ions more than other anchors. The highest colour strength was achieved when using a low amount of anchors from the chlorotriazine system (up to K/S 3.3), whereas carboxylic or trialkoxysilane anchors at the same ratio of anchoring chemical to glucose units achieved comparatively low K/S values. The polyelectrolyte values of treated cotton fabric were also measured. SEM was used to investigate the surface morphology of the treated cotton fabric samples.

Anionically-modified cotton and surface layer formation with polyelectrolytes

El-Shafei A., Knittel D., Schollmeyer E.

Autex Research Journal

2006

Vol. 6, no. 3

175--181

Carboxymethyl cellulose (CMC) is a water-soluble cellulose derivative widely used in textile preparations, especially for the application of sizes, which are removed shortly after the weaving process. In this paper, a strategy is given for using CMC as an anionical polymeric modifier of cotton surfaces with permanent character-imparting stable properties, such as after cationic dyeing, durable press properties and polyelectrolyte layer formation, without the use of dangerous chemicals like chloroacetic acid or salts. Thus CMC was fixed onto cotton by using CMC and Na-hydroxydichlorotriazine as an anchoring chemical. The fabric samples before and after finishing were monitored for polyelectrolyte titration values, wet and dry crease recovery angle, and K/S values after fixation of cationic dyestuff.