Search results

1 – 10 of over 7000
To view the access options for this content please click here
Article
Publication date: 10 July 2007

H.Y. Mostafa, A.M.A. Nada, A.M.M. Elmasry and M.E. Mahdi

The purpose is to focus on improving the water or metal ion uptake of modified cellulose.

Abstract

Purpose

The purpose is to focus on improving the water or metal ion uptake of modified cellulose.

Design/methodology/approach

Grafting copolymerisation of hydrophilic monomers such as acrylamide or hydrophobic monomers as acrylonitrile onto cotton linters was performed.

Findings

The grafting process has two advantages. The first is to replace the hydroxyl group of C6 of the glucose units in the substrate by carboxyl group that attract the metal ions from the solution. The second is to decrease the number of the hydroxyl groups in the cotton linters so that the hydrogen bonding between the cotton linters strands decreases and so the crystallinity index of substrate decreases by introduction of this hydrophilic group so it becomes more chemically active.

Research limitations/implications

Partial substitution of hydroxyl groups of cellulose by more hydrophilic ones via grafting reaction followed by alkaline hydrolysis was performed. The effects of different conditions such as temperature, time, initiator concentration, monomer concentration and kind of substrate were studied. The polymerisation per cent, grafting per cent, the grafting efficiency and the nitrogen per cent of the grafted samples were determined. The molecular structures of cotton linters, grafted cotton linters with acrylamide and its hydrolysis product were studied using infrared spectroscopy, which indicates the fixation of the monomers on the cotton linters. Sodium binding capacity and the metal ion uptake of some metal ions by the product were determined.

Originality/value

The water or metal ion uptake of the modified cellulose was improved.

Details

Pigment & Resin Technology, vol. 36 no. 4
Type: Research Article
ISSN: 0369-9420

Keywords

To view the access options for this content please click here
Article
Publication date: 6 March 2007

D.P. Chattopadhyay, R.B. Chavan and J.K. Sharma

Fibre reactive dyes are very popular for cellulosic garments as they are environmentally safe and having good overall fastness properties. But application of these dyes…

Abstract

Purpose

Fibre reactive dyes are very popular for cellulosic garments as they are environmentally safe and having good overall fastness properties. But application of these dyes requires a very high concentration of salt. The salt released from garment dyeing increases salinity in drain water stream which has a negative impact on environmental ecology. The present work aims to eliminate the usage of salt during dyeing of cotton goods with reactive dyes.

Design/methodology/approach

The methodology adopted here, for the elimination of salt in cotton dyeing, was based on the principle of cationisation (to develop a positive charge) of cotton. The same was achieved by subjecting the caustic pretreated cotton fabric samples to a treatment of 1, 2 dichloroethane followed by methylamine to introduce amino groups in the cellulose structure. The treated cotton when dyed from slightly acidic bath generates positive sites due to protonation in the amino group. The reactive dyes being anionic (negatively charged) in solution get attracted to the positive charges on the fibre which eliminates the salt requirements for satisfactory dye exhaustion.

Findings

The investigation was conducted for cold brand, hot brand and highly exhaustive reactive dyes. The modified cotton showed excellent dye exhaustion for all the dyes in the absence of salt. The treatment was found to improve the dye fixation also. The modification was assessed through elemental analysis.

Research limitations/implications

This study may be further extended to viscose material after suitably modifying the treatment conditions.

Practical implications

A pretreatment to cotton which could eliminate the usage of salt in its dyeing with reactive dyes is revealed.

Originality/value

The study explored a newer technique of cotton dyeing without salt usage. Both garment dyeing units and fabric/yarn finishing industries would thus be helpful.

Details

International Journal of Clothing Science and Technology, vol. 19 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

To view the access options for this content please click here
Article
Publication date: 12 December 2018

Ashwini A. Patil, Saptarshi Maiti and Ravindra V. Adivarekar

Cotton being an anionic fiber can be dyed with direct, reactive, vat and sulfur dyes but cannot be dyed with acid dyes due to their chemical differences. But there are…

Abstract

Purpose

Cotton being an anionic fiber can be dyed with direct, reactive, vat and sulfur dyes but cannot be dyed with acid dyes due to their chemical differences. But there are certain advantages of acid dyes like acid dyeing is the simplest method than the other classes of dyes; and it offers various intense and bright shades. So, the purpose of this paper is to focus on acid dyeing of cotton fabric after its chemical modification.

Design/methodology/approach

Such modification of cotton fabric has been achieved using poly(amido)amine dendrimer (PAMAM) treatment. The current work is based on the synthesis of a full-generation PAMAM dendrimer (G0) and its application onto the cotton fabric for modifying the cotton substrate by the exhaust and padding method.

Findings

The treatment of the dendrimer on cotton fabric has been analyzed by Fourier transform infrared spectroscopy and scanning electron microscopy. The dyeing results in terms of color strength of the treated cotton fabrics are compared with those of conventional acid dyed silk fabric. The fastness assessments such as wash, light and rubbing fastnesses after dyeing of treated cotton fabrics are also performed and found to be satisfactory.

Originality/value

This paper can be used in the application of synthesized poly(amido)amine dendrimer in acid dyeing of cotton.

Details

International Journal of Clothing Science and Technology, vol. 31 no. 2
Type: Research Article
ISSN: 0955-6222

Keywords

To view the access options for this content please click here
Article
Publication date: 1 February 2008

A.R. Moghassem

Grey cotton fibers with a mean fiber length and fineness of 29 mm and 4.2 micronair was pretreated, scoured and dyed. Three ring yarns were spun separately from 100% grey…

Abstract

Grey cotton fibers with a mean fiber length and fineness of 29 mm and 4.2 micronair was pretreated, scoured and dyed. Three ring yarns were spun separately from 100% grey cotton (R.R.Y.), 50% dyed and 50% grey cotton blend (M.R.Y.) and 100% dyed cotton (D.R.Y.). The extent of fiber damage was assessed by measuring the length and the mechanical characteristics of cotton fibers after passing the fibers through the lap machine and the draw frame II. Properties of R.R.Y., M.R.Y. and D.R.Y. samples were examined. In terms of tenacity and elongation at break, grey and dyed cotton fibers, which were selected after being processed by the lap machine and the draw frame II, were very similar. The fiber length by number and weight of grey cotton was longer than that of dyed cotton, while the amount of fiber nep and short fiber content of dyed cotton were more than those of grey cotton.

The three yarn samples were the same in terms of elongation at break. The tenacity of R.R.Y. was the highest but the yarn sample was the lowest in terms of coefficients of mass variation (Cv%), imperfection and hairiness in comparison with the M.R.Y. and D.R.Y. samples.

Details

Research Journal of Textile and Apparel, vol. 12 no. 1
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Article
Publication date: 1 August 2015

Karthikeyan M Ramasamy

Organic cotton, which is produced without any chemical fertilizers and pesticides, is playing a vital role in creating a less harmful environment. An investigation of the…

Abstract

Organic cotton, which is produced without any chemical fertilizers and pesticides, is playing a vital role in creating a less harmful environment. An investigation of the properties of weft knitted fabrics produced from organically made cotton vis-à-vis regular cotton knitted fabric is reported. The yarn is made with both organically produced and regular cotton, and the fabric is knitted by using single jersey machines. The fabrics are subsequently dyed by using natural dyes. The naturally dyed knitted fabrics are examined for shrinkage, bursting strength, abrasion resistance, and colour fastness properties. The result shows that the knitted fabrics produced from organically grown cotton is superior in performance in comparison with fabrics produced from regular cotton.

Details

Research Journal of Textile and Apparel, vol. 19 no. 3
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Article
Publication date: 9 August 2021

Seung-Eun Lee

This study aims to explore whether fabric contents, specifically cotton and polyester, possess particular personality dimensions, as posited by Aaker (1997). The author…

Abstract

Purpose

This study aims to explore whether fabric contents, specifically cotton and polyester, possess particular personality dimensions, as posited by Aaker (1997). The author examined both explicit (conscious, deliberate) and implicit (unconscious, automatic) perceptions of brand personality traits of cotton and polyester.

Design/methodology/approach

The convenience sample of this study included 51 students from different merchandising classes in a Midwestern university. Participants were first directed to the multidimensional implicit association test (md-IAT) and their implicit perceptions were measured for the content of the two fabrics (cotton and polyester) on five different personality attribute dimensions (sincerity, excitement, competence, sophistication and ruggedness). After the IAT, participants completed the post-IAT survey, including explicit measures of brand personality attributes of cotton and polyester.

Findings

The findings of this study show that fabric contents can be successfully described and differentiated by Aaker’s brand personality dimensions. Compared with polyester, the distinctive brand personality of cotton was the favorable association between cotton and sincerity. This association was significantly higher than all other personality dimensions in both consumers’ implicit and explicit perceptions. Neither cotton nor polyester was significantly associated with the exciting, competent and sophisticated personality dimensions.

Originality/value

A unique contribution of this study is that it examines implicit perceptions of the brand personality traits of cotton and polyester. The use of the md-IAT in this study allowed the assessment of consumers’ automatic associations with cotton and polyester of which they may not be aware.

Details

Research Journal of Textile and Apparel, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Article
Publication date: 24 August 2021

Wenshou Yan and Kaixing Huang

During world price spike periods, the government is more likely to apply trade distortions to stabilize domestic prices, but the trade distortions would amplify…

Abstract

Purpose

During world price spike periods, the government is more likely to apply trade distortions to stabilize domestic prices, but the trade distortions would amplify fluctuations of international market prices. Which type of policy may stabilize the domestic market price, but not disturb the international market? This paper answers the question by taking public storage policy as a case study in the context of trade policy. Specially, this paper tries to identify the effect of domestic public storage on the world market price.

Design/methodology/approach

This article extends a standard theoretical model of trade policy through incorporating domestic public storage policy and makes the model more applicable in the context of China. The extended model is then applied to analysis how domestic public storage policy affects the international market price in the context of trade policy. Finally, a properly identified structural vector auto-regression technique is applied to test the effect of domestic public storage on the world market price by using cotton data from China.

Findings

The theoretical model indicates that China's public storage policy could stabilize the international market price. In order to test the working mechanisms, China's soaring public storage between 2010 and 2014 is employed to identify the effects of China's cotton storage on the volatility of the world price. The empirical findings show that China was able to stabilize the international price of cotton to a non-trivial extent through alteration of its public stockpile.

Originality/value

The first contribution is that this paper extends a standard theoretical model of trade policy to incorporate domestic public storage policy, which enables us to explore the effects of domestic public storage policy on the world price in the context of China. The second major contribution is that this paper provides evidence that, as a large player in the world market, China's public storage policy could stabilize the international agricultural price to a substantial degree.

Details

China Agricultural Economic Review, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1756-137X

Keywords

To view the access options for this content please click here
Article
Publication date: 5 July 2021

Yinchun Fang, Xinhua Liu, Hailong Liu and Qian Wang

Cotton is one of the most common nature textile fiber that is widely used in clothing, bedding and decorative fields due to its comfort. However, the cellulosic cotton

Abstract

Purpose

Cotton is one of the most common nature textile fiber that is widely used in clothing, bedding and decorative fields due to its comfort. However, the cellulosic cotton fiber has its own drawbacks. Cotton fiber belongs to flammable material with the limiting oxygen index (LOI) value about 18% that restricts its applications. Cotton fiber is easy to crease during the repeat wearing and laundering process that will influence the wearability. Therefore, it is very important to improve the flame retardancy and anticrease performance of cotton fabric.

Design/methodology/approach

In this study, flame retardant and anticrease multifunctional modifications of cotton fabric were conducted by one-step pad–dry–cure process using eco-friendly phytic acid and 1, 2, 3, 4-butanetetracarboxylic acid.

Findings

The results of limited oxygen index (LOI) values and vertical burning test indicate that the flame retardancy of modified cotton fabric was greatly improved. The LOI value of modified cotton fabric reached 30.8% when the usage of phytic acid was 12%. The crease recovery angle was over 250° of the modified cotton fabric revealing good anticrease performance.

Originality/value

This research provides a novel feasible cost-effective one-step method for the multifunctional modified cellulosic fiber using eco-friendly chemical agents.

Details

International Journal of Clothing Science and Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0955-6222

Keywords

To view the access options for this content please click here
Article
Publication date: 18 May 2021

Baneswar Sarker and Shankar Chakraborty

Like all other natural fibers, the physical properties of cotton also vary owing to changes in the related genetic and environmental factors, which ultimately affect both…

Abstract

Purpose

Like all other natural fibers, the physical properties of cotton also vary owing to changes in the related genetic and environmental factors, which ultimately affect both the mechanics involved in yarn spinning and the quality of the yarn produced. However, information is lacking about the degree of influence that those properties impart on the spinnability of cotton fiber and the strength of the final yarn. This paper aims to discuss this issue.

Design/methodology/approach

This paper proposes the application of discriminant analysis as a multivariate regression tool to develop the causal relationships between six cotton fiber properties, i.e. fiber strength (FS), fiber fineness (FF), upper half mean length (UHML), uniformity index (UI), reflectance degree and yellowness and spinning consistency index (SCI) and yarn strength (YS) along with the determination of the respective contributive roles of those fiber properties on the considered dependent variables.

Findings

Based on the developed discriminant function, it can be revealed that FS, UI, FF and reflectance degree are responsible for higher YS. On the other hand, with increasing values of UHML and fiber yellowness, YS would tend to decrease. Similarly, SCI would increase with higher values of FS, UHML, UI and reflectance degree, and its value would decrease with increasing FF and yellowness.

Originality/value

The discriminant functions can effectively envisage the contributive role of each of the considered cotton fiber properties on SCI and YS. The discriminant analysis can also be adopted as an efficient tool for investigating the effects of various physical properties of other natural fibers on the corresponding yarn characteristics.

Details

Research Journal of Textile and Apparel, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 1560-6074

Keywords

To view the access options for this content please click here
Book part
Publication date: 29 November 2012

Inna Rudenko, Utkur Djanibekov, Kudrat Nurmetov and John P.A. Lamers

Intensive agricultural production in the countries of the Aral Sea Basin has resulted in undesirable ecological and social consequences, including the drying of the Aral…

Abstract

Intensive agricultural production in the countries of the Aral Sea Basin has resulted in undesirable ecological and social consequences, including the drying of the Aral Sea. Water has become scarce due to a score of internal and external factors including the growing demand for water resources by the upstream countries, expansion of the irrigated areas to ease food insecurity, and the poor condition of irrigation and drainage networks. To cope with environmental consequences and regional water challenges, it is vital to look for pathways of improved integrated water resource management, higher water use efficiencies, and reducing overall water use.

A combination of value chain and water footprint analyses of the dominant crop, cotton, was applied to assess water use in different sectors of the Uzbekistan economy and to seek water saving and improved water management and efficiency options.

The findings show that reduction in water use could be achieved by diversifying the economy and moving from water intensive agricultural production to less water consuming industrial sectors by introducing water saving irrigation technologies and by raising awareness of the population about the real value of water.

The combined findings of the economic based value chain analysis and ecologically oriented water footprint analysis gave an added value for better informed decision-making to reach land, water, and ecosystem sustainability and to contribute to the Millennium Development Goals of eradicating poverty and hunger and achieving food and water security.

Details

Disaster by Design: The Aral Sea and its Lessons for Sustainability
Type: Book
ISBN: 978-1-78190-376-6

1 – 10 of over 7000