Journal
VIBRATIONAL SPECTROSCOPY
Volume 60, Issue -, Pages 154-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.vibspec.2011.11.007
Keywords
Polyethylene (PE); Density; Raman spectroscopy; Generalized two-dimensional (2D) correlation spectroscopy; Hetero correlation analysis
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Funding
- National Research Foundation (NRF)
- Ministry of Education. Science and Technology [2009-0075648]
- National Research Foundation of Korea [2009-0075648] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The thermal behavior of polyethylene (PE) below its melting temperature (T-m) in relation to the density variation was studied by Raman spectroscopy combined with two-dimensional (2D) correlation analysis. The Raman spectra of homo and 1-octene copolymerized PEs were collected by varying the sample temperature from 30 to 100 degrees C, where pre-melting would occur. The spectral variation upon temperature perturbation was dependent on the density. For a deeper understanding of the thermal behaviors, 2D hetero correlation analysis was performed for the temperature-dependent Raman spectra of homo and 1-octene copolymerized PEs. The hetero-sample correlation analysis revealed that even below T-m, co-monomer side chains excluded from the crystalline lattice of the PE underwent partial fusion, indicating that such a conformational defect was closely related to the pre-melting of PE. (C) 2011 Published by Elsevier B.V.
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