Acrylic fibers do build up moderate static charge and soften at 190°–250°C. Acrylic fiber 1. 3.3. There is a direct link between the mechanical properties obtained in the carbon fiber with those present in the precursor polymer. 3.5). 3.4 that the tenacity of all the yarns of Group A increases after bulking, whereas in case of core-sheath type DREF-III yarns (Group B yarns) there is a significant drop in tenacity (Fig. Most commercial acrylic fibers are in fact copolymers of acrylonitrile and other vinyl monomers, such as vinyl chloride, vinyl acetate, vinyl alcohol, vinylidene chloride, acrylic acid, methacrylic acid, and methacrylate esters [37,38]. The high quality and performance characteristics of the fiber allow to process it by any light industry process. The bulking treatment reduces the breaking load of all the fabric samples considerably, and the 100% cotton fabrics show a much higher breaking load than the corresponding cottonâacrylic blended bulked fabrics. In dry spinning, the dissolved polymers are extruded into warm air. This is a pseudocrystalline order, illustrated in Fig.Â 1.52. It also increases the effective twist per unit length of the yarn. The fibers are easily stretched in water or steam that is held close to 100Â°C because the glass transition temperature of the wet acrylic fiber is 75Â°C. This trend is true for all the yarn technologies. The fiber cross section of dry spinning is dumbbell-shaped, and the wet spinning (NaSCN is the solvent) is round. There are several industrial methods of producing acrylic fibres; many of them use hydrogen cyanide, HCN, which is a highly volatile liquid and high temperatures reaching 600Â°C. Use of acrylic fibre is growing as it is used by blending with other materials such as staple fibers for imparting enhanced characteristics to end products. What are the characteristics? Gupta, M. Afshari, in Handbook of Tensile Properties of Textile and Technical Fibres, 2009. On the other hand, with the increase of plasma treatment time, say from 1 to 5Â min, the exhaustion rate of nitrogen-plasma treated acrylic fiber reaches a maximum at 3Â min and decreases afterward. Also groups are formed in the fiber surface; these groups are hydrophilic in nature. Acrylic is our final fiber. A "manufactured fiber" is one that is not found naturally, but rather is man-made. The solvents for acrylic polymers should contain functional groups that react with nitrile groups and break the strong dipolar bonds, thereby allowing dissolution to occur.5 N,Nâ-dimethylformamide (DMF) is a good solvent for this purpose. 34-56. Acrylic fibers do build up moderate static charge and soften at 190Â°â250Â°C. Elle permet la fabrication d'articles qui ne nÃ©cessitent pas de repassage et sÃ¨chent vite, de vÃªtements de travail (rÃ©sistance aux acides), de couvertures (pouvoir adiathermique Ã©levÃ©) et s'ouvre au domaine de la confection (infroissabilitÃ©). However, with the use of low-temperature plasma, acid dyes can be used for dyeing acrylic fibers (Yan et al., 2005). Copyright Â© 2020 Elsevier B.V. or its licensors or contributors. The relative shrinkage of the ring and rotor yarns is almost the same whereas the DREF-II yarn shows less shrinkage .