High-strain deformation of polyethylenes in plane-strain compression at elevated temperatures

被引：0

作者：

Lezak, E. ^{[1
]}

Bartczak, Z. ^{[1
]}

机构：

[1] Centre of Molecular Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland

来源：

Journal of Applied Polymer Science | 2007年 / 105卷 / 01期

关键词：

The deformation and recovery behavior of several polyethylenes and ethylene-based copolymers with various molecular architectures and a broad range of molecular masses and molecular mass distributions was studied. Because of the differences in the molecular characteristic; this series exhibited a relatively broad range of crystallite sizes and crystallinity levels. The samples were subjected to high strain compression under plane-strain conditions at the elevated temperature of 80°C. The unloading of the compressed samples led to substantial nonelastic recovery of the strain. The stress-strain and recovery behavior was related to the molecular parameters. The results confirmed the common deformation scheme with four crossover points related to the activation of subsequent deformation mechanisms; as proposed by Strobl. Although the critical strains; related to the activation of deformation of the crystalline component; are invariant; the critical strain of the last point; which is related to the activation of chain disentanglement in the amorphous component; depends on the temperature of deformation. That critical strain decreases from 1.0 to approximately 0.8-0.9 as the temperature of deformation increases from room temperature to 80°C. This shift results from an increase in the chain mobility with increasing temperature; and this makes modification of the molecular network through chain disentanglements easier. © 2007 Wiley Periodicals; Inc;

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