Changes in the Structure and Mechanical Properties of Hard Elastic and Porous Polypropylene Films upon Annealing and Orientation

The effect of the annealing temperature on the characteristics of hard elastic polypropylene samples obtained by annealing of extruded films and having an oriented lamellar structure is studied. It is established using the methods of X-ray scattering and differential scanning calorimetry that the la...

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Bibliographic Details
Published in:Physics of the solid state 2018-10, Vol.60 (10), p.2019-2025
Main Authors: Elyashevich, G. K., Kuryndin, I. S., Lavrentyev, V. K., Popova, E. N., Bukošek, V.
Format: Article
Language:English
Subjects:
ANNEALING
CALORIMETRY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Elastic properties
ELONGATION
ENTHALPY
Extrusion
LAMELLAE
Lamellar structure
MECHANICAL PROPERTIES
Melt temperature
MELTING POINTS
MICROSTRUCTURE
Modulus of elasticity
Orientation effects
PERMEABILITY
Physics
Physics and Astronomy
Physics of Strength
Plasticity
POLYPROPYLENE
POROSITY
POROUS MATERIALS
Solid State Physics
THICKNESS
X-RAY DIFFRACTION
X-ray scattering
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Summary:The effect of the annealing temperature on the characteristics of hard elastic polypropylene samples obtained by annealing of extruded films and having an oriented lamellar structure is studied. It is established using the methods of X-ray scattering and differential scanning calorimetry that the lamellae thickness, the large period, and the degree of orientation of the folded lamellae increase with an increase in the annealing temperature, which is accompanied by an increase in the melting temperature and enthalpy. Porous films are obtained by uniaxial extension of the annealed samples in the orientation direction. It is shown that the porosity and permeability of the porous films increase with an increase in the annealing temperature, owing to an increase in the number and sizes of the through channels. The mechanical characteristics (strength, elastic modulus, and break elongation) of the hard elastic and porous films are measured, and their relationship with changes in the structure and orientation of the samples, depending on the annealing temperature, is established.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418100074