Two-Dimensional Fourier Transform Infrared (FT-IR) Correlation Spectroscopy Study of the Imidization Reaction from Polyamic Acid to Polyimide

2014 ◽  
Vol 68 (6) ◽  
pp. 657-662 ◽  
Author(s):  
Yuan Xu ◽  
Qinghua Zhang
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Spectroscopy Study ◽  
Polyamic Acid ◽  
Ft Ir

Variable-Temperature Fourier Transform Infrared Spectroscopic Investigations of Poly(3-Hydroxyalkanoates) and Perturbation-Correlation Moving-Window Two-Dimensional Correlation Analysis. Part I: Study of Non-Annealed and Annealed Poly(3-Hydroxybutyrate) Homopolymer

2009 ◽  
Vol 63 (9) ◽  
pp. 1027-1033 ◽  
Author(s):  
Miriam Unger ◽  
Shigeaki Morita ◽  
Harumi Sato ◽  
Yukihiro Ozaki ◽  
Heinz W. Siesler
Keyword(s):  
Fourier Transform ◽  
Correlation Analysis ◽  
Crystalline State ◽  
Variable Temperature ◽  
Fourier Transform Infrared ◽  
Melting Behavior ◽  
Correlation Spectroscopy ◽  
Moving Window ◽  
Two Dimensional ◽  
Ft Ir

Generalized two-dimensional correlation spectroscopy (2DCOS) and perturbation-correlation moving-window two-dimensional (PCMW2D) correlation spectroscopy were applied to explore the melting behavior of non-annealed and annealed poly(3-hydroxybutyrate) (PHB) homopolymer as studied by variable-temperature Fourier transform infrared (FT-IR) spectroscopy. The absorption band of the C=O stretching vibration was employed to investigate the structural changes during the heating process (30–200 °C). Non-annealed PHB showed a recrystallization process in the temperature range 30–120 °C. In the asynchronous 2D correlation spectrum we clearly captured the existence of two components in the crystallinity-sensitive wing of the C=O stretching mode: a well-ordered crystalline state at lower wavenumbers (1718 cm−1) and a less ordered crystalline state at higher wavenumbers (1724 cm−1). These crystallinity-sensitive bands at 1718 and 1724 cm−1, which are not readily detectable in the one-dimensional (1D) FT-IR spectra, share asynchronous cross-peaks with bands at around 1737 and 1747 cm−1 assignable to the C=O stretching absorptions due to the amorphous components. In the case of the melting process of non-annealed PHB in the temperature range 120–200 °C, it is helpful to use the PCMW2D correlation analysis, which indicates the recrystallization between 40 and 110 °C by the shift of the C=O stretching band from 1726 cm−1 to 1722 cm−1 and the sharp change to the broad amorphous C=O stretching absorption at 1747 cm−1 at the melting temperature of PHB around 190 °C. For an annealed sample of PHB only the melting behavior was observed in the PCMW2D correlation analysis by the sharp transition from the crystalline to the amorphous C=O stretching band.

Application of Step-Scan Interferometry to Two-Dimensional Fourier Transform Infrared (2D FT-IR) Correlation Spectroscopy

1991 ◽  
Vol 45 (1) ◽  
pp. 12-17 ◽  
Author(s):  
Richard A. Palmer ◽  
Christopher J. Manning ◽  
James L. Chao ◽  
Isao Noda ◽  
Anthony E. Dowrey ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Ft Ir

Two-dimensional Fourier-transform infrared correlation spectroscopy study of the high-pressure tuning of proteins

2000 ◽  
Vol 22 (1-2) ◽  
pp. 119-125 ◽  
Author(s):  
L. Smeller ◽  
P. Rubens ◽  
J. Frank ◽  
J. Fidy ◽  
K. Heremans
Keyword(s):  
High Pressure ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional ◽  
Spectroscopy Study ◽  
Pressure Tuning

Thermal Degradation of Poly(3-hydroxybutyrate) and Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) in Nitrogen and Oxygen Studied by Thermogravimetric–Fourier Transform Infrared Spectroscopy

2007 ◽  
Vol 61 (7) ◽  
pp. 755-764 ◽  
Author(s):  
Christian Vogel ◽  
Shigeaki Morita ◽  
Harumi Sato ◽  
Isao Noda ◽  
Yukihiro Ozaki ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Fourier Transform ◽  
Thermal Degradation ◽  
Degradation Mechanism ◽  
Fourier Transform Infrared ◽  
Nitrogen Atmosphere ◽  
Correlation Spectroscopy ◽  
Ft Ir ◽  
Higher Temperature ◽  
Ir Spectroscopic

The thermal degradation behavior of poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxybutyrate- co-3-hydroxyhexanoate) (P(HB- co-HHx), HHx = 12 mol%) has been studied under different environmental conditions by thermogravimetric analysis (TGA) Fourier transform infrared (FT-IR) spectroscopy. It is reported that at higher temperature (>400 °C) carbon dioxide and propene are formed from the decomposition product crotonic acid in a nitrogen atmosphere, whereas in an oxygen atmosphere propene oxidizes in a further step to carbon dioxide, carbon monoxide and hydrogen. It was also found that PHB and P(HB- co-HHx) have a similar thermal degradation mechanism. The analysis of the FT-IR-spectroscopic data was performed with 2D and perturbation-correlation moving-window 2D (PCMW2D) correlation spectroscopy.

Study of microbial polyhydroxyalkanoates using two-dimensional Fourier-transform infrared correlation spectroscopy

2001 ◽  
Vol 82 (4) ◽  
pp. 934-940 ◽  
Author(s):  
Qiong Wu ◽  
Ge Tian ◽  
Suqin Sun ◽  
Isao Noda ◽  
Guo-Qiang Chen
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional

Water Uptake of Poly(2-N-Alkyl-2-Oxazoline)s: Temperature-Dependent Fourier Transform Infrared (FT-IR) Spectroscopy and Two-Dimensional Correlation Analysis (2DCOS)

2012 ◽  
Vol 66 (10) ◽  
pp. 1145-1155 ◽  
Author(s):  
Erik F.-J. Rettler ◽  
Miriam V. Unger ◽  
Richard Hoogenboom ◽  
Heinz W. Siesler ◽  
Ulrich S. Schubert
Keyword(s):  
Fourier Transform ◽  
Ir Spectroscopy ◽  
Correlation Analysis ◽  
Water Uptake ◽  
Fourier Transform Infrared ◽  
Two Dimensional ◽  
Temperature Dependent ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

One- and two-dimensional Fourier transform infrared correlation spectroscopy of Phyllagathis rotundifolia

2011 ◽  
Vol 1006 (1-3) ◽  
pp. 297-302 ◽  
Author(s):  
Hooi Poay Tan ◽  
Sui Kiong Ling ◽  
Cheng Hock Chuah
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Correlation Spectroscopy ◽  
Two Dimensional
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