Effect of Concentrated Alkali Treatment on the Properties of Naturally Colored Brown Cotton

2011 ◽  
Vol 332-334 ◽  
pp. 173-178
Author(s):  
Li Chen ◽  
Yu Sen Liu ◽  
Wei Guo Sun ◽  
Xiao Yan Zhou
Keyword(s):  
Sodium Hydroxide ◽  
Cotton Fiber ◽  
Breaking Strength ◽  
Sodium Hydroxide Solution ◽  
Fiber Strength ◽  
Alkali Treatment ◽  
Treatment Temperature ◽  
Color Differences ◽  
Colored Cotton ◽  
Naturally Colored Cotton

The naturally colored cotton fiber was treated by sodium hydroxide solution with different concentrations and temperatures.The surface morphology,crystalline structure, mechanical properties and color feature value of fiber after treatment were tested by SEM,XRD,electronic single fiber strength tester and Computer Color Matching meter.The results show that the longitudinal convolutions of the naturally colored cotton fiber treated by concentrated sodium hydroxide decreased or disappeared,and the fiber became nearly cylindrical or cylindrical.The crystallinity of fiber after treatment decreased,part of the celluloseⅠ changed into celluloseⅡ．The breaking strength and breaking elongation of fiber after treatment increased.The total color differences（ΔE） and value a*of fiber after treatment increased，to the contrary，value L* and value b* decreased，which leaded to that the color of fiber treated by alkali became darker．In addition,the treatment temperature had larger influence on the properties of fiber.

scholarly journals Plant breeding in the semiarid region of Brazil: examples of success

2012 ◽  
Vol 12 (spe) ◽  
pp. 57-66 ◽  
Author(s):  
Manoel Abílio de Queiroz ◽  
Levi de Moura Barros ◽  
Luiz Paulo de Carvalho ◽  
Jonas de Araújo Candeia ◽  
Edinardo Ferraz
Keyword(s):  
Cotton Fiber ◽  
Production Systems ◽  
Rio Grande ◽  
Semiarid Region ◽  
Breeding Programs ◽  
Caatinga Biome ◽  
Colored Cotton ◽  
Nut Production ◽  
Production Area ◽  
Naturally Colored Cotton

The Northeastern region of Brazil comprises the Caatinga biome (900,000 km²) part of which is a semiarid region with rainfed and irrigated production systems. Among the successful breeding programs are cashew and cotton. The first led to a substantial increase in nut production in Ceará, Rio Grande do Norte and Piauí and the second bred a naturally colored cotton fiber, now processed in small clothing industries in Paraiba, exporting to 11 countries. In the lower-middle São Francisco valley, the previously grown onion was replaced by improved varieties, on 90% of the production area, and by industrial tomato, introduced by research in 1972, which came to be used on more than 80% of the area at the time. The participation of the private sector and continuity of breeding programs were crucial for the success. More examples of success are expected with the establishment of postgraduate courses in Agricultural Sciences in the Semiarid region.

Naturally Colored Organic Cotton and Naturally Colored Cotton Fiber Production

2018 ◽  
pp. 81-99
Author(s):  
Gizem Karakan Günaydin ◽  
Ozan Avinc ◽  
Sema Palamutcu ◽  
Arzu Yavas ◽  
Ali Serkan Soydan
Keyword(s):  
Cotton Fiber ◽  
Fiber Production ◽  
Organic Cotton ◽  
Colored Cotton ◽  
Naturally Colored Cotton

Qualitative analysis of cotton fiber pigment composition

2020 ◽  
pp. 004051752093223
Author(s):  
Mengying Chen ◽  
Ting Ting Zhang ◽  
Li He ◽  
Kezuo Wang ◽  
Yiren Chen
Keyword(s):  
Cotton Fiber ◽  
Cotton Fibers ◽  
Liquid Chromatography Mass Spectrometry ◽  
Pigment Composition ◽  
Composition And Structure ◽  
Diagnostic Agents ◽  
Colored Cotton ◽  
White Cotton ◽  
Naturally Colored Cotton ◽  
Main Component

Naturally colored cotton is a green textile material. To cultivate new colored cotton and improve its performance, we must first understand the types, composition, and formation mechanism of the pigments in colored cotton. This study aims to explore the composition and structure of cotton fiber pigments. Qualitative analyses of pigment extracts from brown cotton, green cotton, and white cotton fibers were carried out using ultraviolet spectroscopy, diagnostic agents, and liquid chromatography–mass spectrometry. The main component of cotton fiber pigments was flavonoids, and specific types of flavonoids were found in the pigments in brown cotton, green cotton, and white cotton fibers. Research on the composition of cotton fiber pigments can increase our understanding of colored cotton fibers and lay a foundation for the cultivation, planting, and development of colored cotton fibers, as well the identification of naturally colored cotton from dyed cotton.

Preparation and Properties of Long Wheat Straw Fibers Used for Composite

2012 ◽  
Vol 476-478 ◽  
pp. 843-846
Author(s):  
Gang Wei Pan ◽  
Xiu Liang Hou ◽  
Zhen Dong ◽  
Jing Zhu ◽  
Dan Huang ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Wheat Straw ◽  
Alkali Treatment ◽  
Treatment Method ◽  
Alkaline Treatment ◽  
Contact Angles ◽  
Treatment Temperature ◽  
Fiber Bundles ◽  
Sodium Hydroxide Concentration ◽  
Treatment Processes

This paper aims to understand the potential of using wheat straw (WS) as a source for composite. High quality fiber bundles are obtained from wheat straw using a simple alkaline treatment method. Wheat straw fibers (WSFs) are used with PLA fibers to make composites. The effect of sodium hydroxide concentration and temperature of the treatment processes for wheat straw fibers on the tensile and flexural properties of the PLA/WSF composites has been investigated. The contact angle of WSF has also been studied. It shows that the the mechanical properties of PLA/WSF composites are optimal when the sodium hydroxide concentration is 2.5% and the alkali treatment temperature is 125°C. The contact angles after alkali treatment decrease significantly, indicating that the surface wettability of the treated wheat straw is improved.

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