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Exhaustion values of dye solutions for different dye concentrations.

Exhaustion values of dye solutions for different dye concentrations.

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The aim of this paper is to establish a test method for the screening of bioengineered cotton fibers with an improved reactivity through the incorporation of positively charged nitrogen moieties. For this purpose a spectrophotometric method based on the absorption of a negatively charged dye (Acid Orange 7) is extensively studied. The processing pa...

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... cotton fibers were used to investigate the effect of dye concentration on the Acid Orange 7 measurements. The exhaustion of the solution was calculated based on transmission measurements of the solution before and after dyeing and the results are shown in Figure 1. ...


... Thus, there is a need to develop new eco-friendly and durable means of producing FR cotton garments. To achieve FR properties in a more environmentally friendly manner, one may explore certain cotton cultivars with claimed intrinsic flame resistant properties [2] or use biotechnology to design new fibres with valuable characteristics [3]. Also, synthesis of aliphatic polyester (polyhydroxybutyrate) within cotton fibres has resulted in measurable improvements in thermal properties of bioengineered cotton fibres [4,5]. ...
The aim of this paper is to study the combustion characteristics of loose fibrous cellulosic compounds through cone calorimeter measurements. The challenge in studying loose fibrous materials by cone calorimeter in a reproducible manner is met by optimizing various process parameters such as sample weight, heat flux and grid type. The method is validated using cotton fibres and fabrics with a range of flame retardant properties. Good correlations are obtained between the flame retardant content of samples and the heat release parameters for both the fibres and the fabrics. In addition, fibres from specific cotton cultivars showed statistically significant differences in heat release characteristics. This shows that valuable data concerning the combustion behaviour and the corresponding kinetics of loose fibrous compounds can be successfully gathered using a cone calorimeter. Thus, such data can be exploited to well define future fibre breeding programmes or fibre modification research. Copyright © 2012 John Wiley & Sons, Ltd.
Genetic improvement of upland cotton (Gossypium hirsutum L.) fiber quality is essential to meet demands of textile manufacturers and the international market while also increasing competitiveness with synthetic fibers. In this chapter, the current state of cotton fiber improvement through advances in breeding and biotechnology is described. In an effort to offer a future prospective of cotton fiber improvement, contemporary and emerging technologies for cotton fiber improvement are discussed.
Previous research reported on a screening method to assess the functionalisation of bioengineered cotton fibres through the absorption of CI Acid Orange 7. The aim of the present paper is to extend this study to different dye classes. Thus the dye absorption of bioengineered cotton fibres containing oligochitin is studied for a series of dye classes. Statistically significant differences were found between cotton lines designed to produce oligochitin in the fibre and their respective controls for all tested dyes, confirming previous results with CI Acid Orange 7. Further, although variations in micronaire influenced dye absorption, it was confirmed for all dyes tested as well as for CI Acid Orange 7 that the oligochitin production had a larger impact on the exhaustion values than the differences in micronaire. The method described in this paper can be applied as a screening tool to meet the challenge of working with small quantities of fibrous materials. Moreover it shows the potential that the incorporated oligochitin has for increasing dyeability with a wide range of dyes and creating fibres with more versatile reactivity.