The weight loss of cotton fibers occurs between 130вЊ and 380вЊ.

Consequently, the amount of the primary cell wall per unit mass is estimated by the measurement of the weight loss as a function of the temperature with TGA. Therefore, two cotton fibers that are identical except for having different maturities have different quantities of primary cell wall per unit of mass. Primary cell wall, which is less than 0.5В mm thick, consists of around 50% cellulose. After chemical processing, these noncellulosic materials are removed, and the cellulose content of the cotton fibers increases to more than 99%.

The remaining 5% noncellulosic compounds are located primarily in the cuticle and primary cell wall and contain wax, pectic substances, organic acids, sugars, and ash-producing organic salts. The quality of baled cotton depends on many factors including variety, weather condition, degree of weathering, cultural, harvesting and storage practices, moisture and trash content and ginning processes.Д¬otton fibers consist essentially of 95% cellulose I (ОІ-1,4- d-anhydroglycopyranose). The fluid loss from the lumens causes the cylindrical fibres to collapse to form twists or convolutions ( Hsieh, 2007).Д¬otton possesses its highest fibre quality and best potential for spinning when the bolls are mature and freshly opened. Drying of the fibres involves the removal of fluids from the lumens and intermolecular water in the cellulose. The fully hydrated fibres are cylindrical and the matured fibres dry into flat twisted ribbon forms. Many species are grown commercially, but they may be conveniently divided into three types by staple lengths: (Type 1) 25вЂ“60 mm, (Type 2) 13вЂ“33 mm and (Type 3) 9вЂ“25 mm ( Thomas, 1995). highly crystalline, oriented and fibrillar ( Hsieh, 2007).Д¬otton is the fine seed hair of plants of the Mallow family the fibre serves probably to accumulate moisture for germination of the seed ( Cook, 2001). The cellulose in cotton fibres is also of the highest molecular weight among all plant fibres and highest structural order, i.e. The non-cellulosics are located on the outer layers or inside the lumens of the fibres whereas the secondary cell wall is purely cellulose. Nearly 90% of the cotton fibres are cellulose. Koh, in Handbook of Textile and Industrial Dyeing, 2011 CottonД¬otton fibres are the purest form of cellulose, natureвЂ™s most abundant polymer. Nevertheless, the assumption that higher cotton fiber orientation will result in higher interfiber friction seems to be reasonable. In addition, cotton fibers of different levels of orientation will likely be different in many other surface-related physical characteristics. With cotton fibers, such analysis will be difficult to replicate since orientation will be directly associated with the growth rate of fibers (a difficult factor to control). In relation to fiber friction, studies on synthetic fibers reveal that the higher the orientation, the more intimate the contact between fibers, and the higher the friction.

Within a given fiber, this index increases from the tip (0вЂ“0.008) to the root of the fiber (above 0.04). A typical birefringence index of cotton may range from 0.04 to 0.09. YEEL MOGAHZY, in Friction in Textile Materials, 2008 6.2.3 Fiber molecular orientationД¬otton fiber molecular orientation is commonly examined using the birefringence index, О” n = n О вЂ“ n вЉҐ, in which n О is the refractive index with the polarized light oscillating in a plane parallel to the fiber axis, and n В± is the refractive index with the light oscillating in a plane perpendicular to the fiber axis.

Astellia cotton fiber