Abstract
A comprehensive survey is presented of the development of tensile drawing, hydrostatic extrusion and die drawing processes for the manufacture of ultra high modulus polyethylene and polypropylene in the form of fibres, films and extruded shapes. The properties of the highly drawn products are described, including mechanical stiffness, creep, strength, melting behaviour, shrinkage, thermal expansion, thermal conductivity, barrier properties and chemical resistance. Finally, there is an account of recent research into possible applications of these materials with particular attention to the reinforcement of brittle matrices, including polymer resins, cement and concrete.
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