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Crystallization Behavior of Poly(3‐hydroxybutyrate) (PHB), Poly(ε‐caprolactone) (PCL) and Their Blend (50:50 wt.%) Studied by 2D FT‐IR Correlation Spectroscopy
Author(s) -
Unger Miriam,
Sato Harumi,
Ozaki Yukihiro,
Siesler Heinz W.
Publication year - 2011
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201000135
Subject(s) - crystallization , crystallinity , caprolactone , materials science , polymer , chemical engineering , fourier transform infrared spectroscopy , polymer chemistry , two dimensional nuclear magnetic resonance spectroscopy , infrared spectroscopy , chemistry , composite material , polymerization , organic chemistry , stereochemistry , engineering
Variable‐temperature FT‐IR spectra of poly(3‐hydroxybutyrate) (PHB), poly(ε‐caprolactone) (PCL) and a PHB/PCL (50:50 wt.%) blend were analyzed by two‐dimensional correlation spectroscopy (2DCOS). For this purpose the ν(CO) region was employed to characterize in some detail the crystallization behavior of the investigated polymer systems during cooling from the melt. The asynchronous 2D correlation spectra clearly captured the existence of three components in the crystallinity‐sensitive region of the CO stretching mode for PHB and PCL, respectively: a well‐ordered, an inter‐mediate and a less ordered crystalline state. Furthermore, by 2DCOS application a sequential order of the observed structural changes could be proposed for the whole temperature range during the crystallization of both polymers. In the case of the PHB/PCL (50:50 wt.%) polymer blend, we have split up the spectral data set in the sub‐sets between 200–120 °C and 70–30 °C for a more detailed 2DCOS analysis. In this way we could separate the crystallization process of PHB and PCL in the polymer blend.