Twaron fiber

Tuz Golu (lake), 5 784 Tversky similarity, 6 8 T vessicant agent, 5 816 physical properties, 5 817t Twaron fiber, 13 373 Tween surfactants, 24 150 12-membered ring macrolides, 15 272, 275t 2,6-TDI, reaction with a polyether triol, 25 459. See also Toluene diisocyanate (TDI)... 

Jia G, Ghen P, Li B, Wang Q, Lu C and Yu Q (2010) Effects of Twaron fiber surface treatment by air dielectric barrier discharge plasma on the interfacial adhesion in fiber reinforced composites. Surf Coat Technol 204 3668-3675. 

Fig. 6.12. Small-angle X-ray scattering curves of a PpPTA (Twaron) fiber measured with a linear position-sensitive counter by J. Aerts, Akzo Res. Lab., h = Injd (d in Angstroms), (a) Equatorial intensity (b) meridional intensity.

Van den Heuvel CJM and Klop EA, High-Performance Fibers - A Bird s eye View of their Structure, Properties and Applications", paper presented at the "9th Twaron Symposium", Konigswinter, Germany, 24/25 April, 2002. Van Krevelen DW, "New Developments in the Field of Flame-Resistant Fibres", Angew Makromol Chem 22 (1972) 133-158. 

Fig. 3.5 Structural hierarchy in liquid-crystalline fibers. The mechanical performance of highly oriented polymers can approach the ultimate theoretical properties at high degrees of elongation. Anisotropic, rod-like macromolecules, like aromatic copolyesters composed of 2,6-naphthyl and 1,4 phenyl units, often form oriented structures, which can exhibit liquid crystallinity. Extensive structural studies of fibers of these oriented copolyesters showed a hierarchical structure like the one depicted in this Figure. In aramids (Kevlar or Twaron) similar structures may exist. Adopted with permission from [17]...

High modulus fibers as strong as steel but have one-fifth of weight, ideally suited as tire cord materials and for ballistic vests, e.g., Kevlar, Twaron. 

Already in 1965, the formation of lyotropic liquid crystalline solutions of poly-(p-aminobenzoic acid) in concentrated sulfuric acid was observed. This work was the basis for the commercialization of high strength, high modulus, and heat-resistant poly-(p-phenylene terephthalate) (PPDT) fibers under the trade name Kevlar (Dupont) and Twaron (Akzo) (Fig. 15) [31]. PPDT is typically prepared by the polycondensation of terephthaloyl chloride and 1,4-pheny-lenediamine in tertiary amidic solvents such as A-methylpyrrolidinone or dimethylacet-... 

---