Oriented sheets and films

Several methods have been developed for the manufacture of films and sheets from thermotropic LCP materials. Bayer has presented a technique to form oriented sheets and films from fibres by pressing at a temperature at which the fibres melt to form a matrix without losing their molecular orientation. For unidirectional mouldings moduli of the order of 50-60 GPa at a tensile strength of 400-500 MPa were obtained [Pg.455]

In a process developed by Hoechst-Celanese, a biaxially oriented film is produced by extruding an anisotropic dope consisting of a polymerization solution of a LCP and a suitable solvent. This film is oriented transversely to the extrusion direction to enhance the transverse strength, after which the film is solidified and the solvent removed. [Pg.456]

In addition to their good mechanical properties, LCP films have very low coefficients of diffusion which make them interesting as high-performance packaging materials. [Pg.456]

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