Dynamic FTIR

Satsuma, A., Enjoji, T., Shimizu, K.I. et al. (1998) Reactivity of surface nitrate species in the selective reduction of NO with propene over Na-H-mordenite as investigated by dynamic FTIR spectroscopy,./. Chem. Soc., Faraday Trans., 94, 301. 

Dynamic FTIR Analysis of PE-n-MMT Thermal Oxidative Degradation... 

Simultaneously to TGA measurements, thermal oxidative degradation of non stabilized samples of PE and PE-n-MMT has been monitored in this work with the aid of a dynamic FTIR spectroscopy in a temperature range of 25 - 240°C. The overall evolution of the dynamic FTIR spectra in the course of thermal-oxidative degradation of PE and PE-n-MMT in the condensed phase is shown in Figure 15 (a, b). 

Figure 16. FTIR spectra of PE - (1) and of PE-n-MMT - (2) taken at 220°C in the course of the heating runs (Excerpted from the corresponding dynamic FTIR spectra sets).

Macromolecular Symposia Vol.94, May 1995, p.75-95 DYNAMIC FTIR SPECTROSCOPY OF POLYMER FILMS AND LIQUID CRYSTALS... 

R. C. Xie, B. J. Qu, and K. L. Hu, Dynamic FTIR studies of thermo-oxidation of expandable graphite-based halogen-free flame retardant LLDPE blends. Polymer Degradation and Stability, 72 (2001), 313-21. 

Morales et al. [323] prepared bionanocomposites of PEA (derived from glycohc acid and 6-aminohexanoic add by in situ polymerization) reinforced with OMMTs. The most dispersed structure was obtained by addition of C25A organoclay. Evaluation of thermal stability and crystallization behavior of these samples showed significant differences between the neat polymer and its nanocomposite with C25A. Isothermal and nonisothermal calorimetric analyses of the polymerization reaction revealed that the kinetics was highly influenced by the presence of the silicate particles. Crystallization of the polymer was observed to occur when the process was isothermally conducted at temperatures lower than 145 °C. In this case, dynamic FTIR spectra and WAXD profiles obtained with synchrotron radiation were essential to study the polymerization kinetics. Clay particles seemed to reduce chain mobility and the Arrhenius preexponential factor. 

Gregoriou, V.G., Rodman, S.E., Nair, B.R., and Hammond, P.T. (2006) Studying the Viscoelastic Behavior of Liquid Crystalhne Polyurethanes Using Static and Dynamic FTIR Spectroscopy, in Vibrational Spectroscopy of Biological and Polymeric Materials (eds V.G. Gregoriou and M.S. Braiman), CRC Press, Taylor Francis, Boca Raton, FL, USA, Ch. 1. 

In the identification of different polymorphs in polymers the FTIR technique presents, with respect to the diffraction techniques, the advantage of easier and more rapid measurements. In particular, the high speed of the measurements allows to study the polymorphic behavior under dynamic conditions. As an example let us recall the study of the transition from the a toward the P form of PBT induced by tensile stresses, evaluated by quantitative analysis of the infrared spectra [83],... 

A number of analytical techniques such as FTIR spectroscopy,65-66 13C NMR,67,68 solid-state 13 C NMR,69 GPC or size exclusion chromatography (SEC),67-72 HPLC,73 mass spectrometric analysis,74 differential scanning calorimetry (DSC),67 75 76 and dynamic mechanical analysis (DMA)77 78 have been utilized to characterize resole syntheses and crosslinking reactions. Packed-column supercritical fluid chromatography with a negative-ion atmospheric pressure chemical ionization mass spectrometric detector has also been used to separate and characterize resoles resins.79 This section provides some examples of how these techniques are used in practical applications. 

The ability of SFE-FTIR to perform a variety of extraction methods is a definite advantage, especially for the study of complex mixtures containing analytes of varying solubility. For analytes which are readily solubilised in C02, direct dynamic and direct static-dynamic SFE-FTIR methods are quite successful. Elimination of the trapping process reduces both analysis time and potential analyte loss arising from... 

Topspe, N.Y., Anstrom, M. and Dumesic, J.A. (2001) Raman, FTIR and theoretical evidence for dynamic structural rearrangements of vanadia/titania dcNOx catalysts, Catal. Lett., 76, 11. 

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