Cross modacrylic

Modacrylic Fibers. Commercial modacrylic fibers contain either vinyl chloride or vinylidene chloride copolymerized with acrylonitrile other monomers may also be present (125). The cross-sectional shapes of different modacrylic fibers vary. 

The modacrylic fibres have similar properties to those of acrylics and are flame resistant..Mostly this fibre is based on a 60/40 or 50/50 copolymer of acrylonitrile with vinylidine chloride (CH = CCy together with small proportion of ternary monomer to improve ionic dyeability or hydrophilicity. The better known modacrylic fibres have a ribbon-shaped or pea-nut shaped cross-section. One problem encountered with modacrylic fibre is loss of lustre at the boil [83, 84]. This fibre is used for apparel, home furnishing, wigs etc. 

The major cross-sectional shapes for acrylics and modacrylics are round, dog bone, kidney bean, elongated, crenelated, mushroom, and ribbon. Many of these shapes are illustrated in Figure 12.23 in Section 12.5. 

Figure 4 (A) Acrylic fiber (Orion 42). Dogbone-like cross-section shape x 750. (B) Acrylic fiber (Acrilan). Bean-shaped cross-section X 240. (C) Modacrylic fiber (Dynel). Deeply-fluted structure x 750. (D) Modacrylic fiber (Dynel). Folded shapes with deep re-entrants x 750. (E) Nylon 6.6, trilobal cross-section x 300. (F) Bicomponent polyester fiber, side-by-side type cross-section x160. (Reproduced with permission from Lewin M and Pearce EM (eds.) (1985) Identification of Textile Materials, 7th edn. Manchester The Textile Institute.)...

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