Characterization of molecular orientation under tensile deformation by near infrared spectroscopy

We present a novel method for characterizing orientation behavior of typical polyethylene (PE) materials such as HDPE, LLDPE, and LDPE. The chain orientation to the stretching direction was examined under uniaxial deformation by near infrared spectroscopy. Then we obtained directly the orientation f...

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Bibliographic Details
Published in:e-Polymers 2012-12, Vol.12 (1), p.803-813
Main Authors: Mizushima, Masami, Kawamura, Takanobu, Takahashi, Kenji, Nitta, Koh-hei
Format: Article
Language:English
Subjects:
Chains
Deformation
High density polyethylenes
Infrared spectroscopy
Low density polyethylenes
Materials science
Near infrared radiation
Orientation
Polymers
Spectrum analysis
Strain
Stretching
Tensile deformation
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Summary:We present a novel method for characterizing orientation behavior of typical polyethylene (PE) materials such as HDPE, LLDPE, and LDPE. The chain orientation to the stretching direction was examined under uniaxial deformation by near infrared spectroscopy. Then we obtained directly the orientation function of PE chain axis ( -axis) from the CH stretching vibration of NIR spectra as a function of extension time or strain. We compared the present method with the conventional infrared IR method where the orientation function of PE -axis (chain-axis) has been indirectly obtained from the -and -axis’s assuming the orthogonal crystal form by using the CH rocking vibrations in IR spectra
ISSN:2197-4586
1618-7229
1618-7229
DOI:10.1515/epoly.2012.12.1.803