In situ near-infrared spectroscopic studies of the structural changes in polyethylene during tensile deformation

Structural and conformational changes occurring during tensile stretching of high-density, linear low-density, and low-density polyethylene materials were investigated with in-situ near-infrared (NIR) spectroscopy. Fragmentation releases the chain ends within crystalline lamellae and the cilia chain...

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Bibliographic Details
Published in:Polymer testing 2014-09, Vol.38, p.81-86
Main Authors: Mizushima, Masami, Kawamura, Takanobu, Takahashi, Kenji, Nitta, Koh-hei
Format: Article
Language:English
Subjects:
Applied sciences
Chains (polymeric)
Clusters
Crystal structure
Exact sciences and technology
Mechanical properties
Molecular conformation
Near-infrared
Physical properties
Plastic deformation
Polyethylene
Polyethylenes
Polymer industry, paints, wood
Properties and testing
Rheo-optics
Spectroscopy
Stretching
Technology of polymers
Tensile deformation
Yield
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Summary:Structural and conformational changes occurring during tensile stretching of high-density, linear low-density, and low-density polyethylene materials were investigated with in-situ near-infrared (NIR) spectroscopy. Fragmentation releases the chain ends within crystalline lamellae and the cilia chains that are embedded in crystalline lamellae, and enables changes from the trans to gauche conformation. Meanwhile, the inclusion of co-monomers in the crystal lattice of linear low-density polyethylene causes the lamellar cluster to soften and stretch. Plastic deformation such as chain unfolding and slippage occurs within lamellar clusters.
ISSN:0142-9418
1873-2348
DOI:10.1016/j.polymertesting.2014.07.002