In blends of liquid crystalline polymers (LCP) with conventional thermoplastics, the development of infinite, thin and highly oriented LCP-fibrils is very important for a substantial mechanical reinforcement of the blends. Such fibrils can be produced by processing a coarse mixture of LCP and polyethyleneterephthalate (PET) powders in an extrusion apparatus in which preferentially elongational, but only weak shear flows occur. The rheological conditions for the success of this process are explained.
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