Process infrared

In addition to the simple chemical methods for following these processes, infrared spectroscopy may also be used. In Fig. 9 is shown the spectrum of silica dried at 200°C before and after reaction with Zr(allyl)4- The characteristic absorption bands of the transition metal-allyl group are clearly displayed, also a significant reduction in the number of hydroxyl groups (3740 cm-1) is also clearly evident. 

ASTM D6122-09 Standard practice for validation of the performance of multivariate process infrared spectrophotometers, m Annual Book of Standards, vol. 5.03, ASTM International, West Conshohocken, PA, 2009. 

E.H. Sargent, Solution-processed infrared optoelectronics Photovoltaics, sensors, and sources, lEEEJ. Sel. Top. Quant. Electr., 14, 1223-1229 (2008). 

Chemical methods based on the study of extractant distribution (TBP) on TVEX-TBP resins were used to demonstrate that TBP is adsorbed by the TVEX porous matrix by physical adsorption. Extractant wash-out from the TVEX matrix is an important characteristic for metal extraction applications of solid adsorbents as TVEX since it may influence the physical-chemical properties of the extraction process. Infrared (IR) spectroscopy analysis of TVEX-TPB resins show the absence of shift for stretching frequency of the P = O group in comparison to the stretching frequency assignment for liquid TBP as an indication that TBP is hold by matrix surface due to physical adsorption as was confirmed from the by enthalpy values of TBP distribution from the TVEX matrix of 45.0 0.5 kJ/mol [10]. 

Weight yield after aromatizatlon of homopolymer and copolymers is much closer to theory as shown in Table 4. This probably indicates less or no MW degradation as is observed in the base catalyzed processes. Infrared spectra and degree of aromatizatlon is essentially the same (with the more volatile acids) as for the uncatalyzed aromatizations. 

Backer, S.L., Campbell, ).R., Stevenson, B.D. and Limberger, T.R. (2004) Hazard assessment testing of in-process infrared decoy composition. Crane Division, Naval Surface Warfare Center, Crane, IN. 

The uncured epoxy system described above was analyzed by DSC/FT-IR as a function of activator/resin ratio. These samples were cured in the DSC cell. DSC traces were generated to characterize the curing process. Infrared spectra were collected simultaneously to monitor the cross-linking activity. The generated spectra for each mix were analyzed and compared to explain differences noted in the DSC curves. 

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