Macroscopic and crystallographic density of solid-state extruded polyethylene |
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Authors: | Raúl E De Micheli Haydee M Vidal Edgardo M Macchi |
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Affiliation: | (1) Centro de Investigaciones Tecnológicas para la Industria Plástica-INTI, Casilla de Correo 157, 1650 San Martín, Argentina;(2) Departamento de Química-INTI, Casilla de Correo 157, 1650 San Martín, Argentina;(3) Division Macromoléculas-INIFTA, Cassila de Correo 16, Suc. 4, 1900 La Plata, Argentina |
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Abstract: | Summary The influence of draw ratio on macroscopic and crystallographic density of polyethylene with different initial morphologies, has been investigated by solid-state extrusion. An initial drop followed by an increase in macroscopic density as a function of draw ratio has been observed. Since precision X-ray measurements of unit cell parameters showed no variation of crystallographic density, it was concluded that plastic deformation of polyethylene upon drawing proceeds with a decrease of the degree of crystallinity. This was confirmed by differential scanning calorimetry. |
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