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Synchrotron small-angle x-ray scattering study of linear low-density polyethylene under uniaxial deformation

Published online by Cambridge University Press:  11 April 2012

Angel Romo-Uribe ,
Angel Manzur  and
Roberto Olayo
Angel Romo-Uribe*
Affiliation:
Laboratorio de Nanopolimeros y Coloides, Instituto de Ciencias Físicas, Universidad Nacional Autonoma de Mexico, Cuernavaca Mor. 62210, Mexico
Angel Manzur
Affiliation:
Departamento de Física, Universidad Autonoma Metropolitana-Iztapalapa, Apartado Postal 55-534, Mexico D. F. 09340, Mexico
Roberto Olayo
Affiliation:
Departamento de Física, Universidad Autonoma Metropolitana-Iztapalapa, Apartado Postal 55-534, Mexico D. F. 09340, Mexico
*
a)Address all correspondence to this author. e-mail: aromo-uribe@fis.unam.mx
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Abstract

Synchrotron time-resolved small-angle x-ray scattering studies were carried out on extruded sheets of linear low-density polyethylene (LLDPE) under tension. Stress–strain traces obtained simultaneously exhibited a double yield behavior. LLDPE initially exhibited lamellar morphology with a long period of 21.5 nm. Initial deformation increased the long period due to flow-induced crystallization. Between the first and second yield points, the lamellae were axially deformed by a slip process toward the tensile direction; off-meridional scattering was produced. In the second yield point region, there was a gradual rotation and thinning of the off-meridional scattering indicating that a shear process was destroying the lamellae. Simultaneously, amorphous scattering arise due to microvoids. Second, a weak meridional scattering was also produced. Strikingly, further deformation in the second yield region (SYR) increased the meridional long period suggesting a recrystallization process. From the cold-drawing region the long period decreased monotonically. The results suggest a melting and recrystallization process in the SYR.

Keywords

X-ray diffractionStress/strain relationshipNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 10: Focus Issue: Crystallization Processes in Polymer-Based Materials , 28 May 2012 , pp. 1351 - 1359
Copyright
Copyright © Materials Research Society 2012

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