Vectran Liquid crystalline polymer

Another important application of thermoplastic fibers such as poly ether ether ketone (PEEK), Poly etherimide(PEI), and VectranM andHS (Vectranis the trade mark of Hoechst liquid crystalline polymer) is in making thermoplastic matrix composites. Commingled yams of the reinforcement and matrix such as quartz/PEEK, glass/PEI, Vectran HS/M are used to make the composites wherein the matrix yarn fuses to form the continuous phase of the composite. 

Rigid-rod polymers are often liquid crystalline polymers classified as lyotropic, such as the aramid Kevlar (DuPont), or thermotropic liquid crystalline polymers, such as Vectran (Celanese) (see Polyamides, Aromatic Liquid Crystalline Polymers, Main-Chain Liquid Crystalline Thermosets). 

Fignre 538. Tensile storage modulus of Vectran liquid crystalline film samples as a function of temperature the number at each curve indicates the angle between the measurement strain direction and the direction of polymer chain orientation (from Menczel et al., 1997a, with permission of Akad miai Kiadb, Hungary). 

Fig. 13.1 Molecular structure of aromatic polyester based liquid crystalline polymer, Vectran (Calundann 1980)...

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