Fourier-transform infrared hydrolysis

Many methods are currently available for the qualitative analysis of anthocyanins including hydrolysis procedures," evaluation of spectral characteristics, mass spectroscopy (MS), " nuclear magnetic resonance (NMR), and Fourier transform infrared (FTIR) spectroscopy. - Frequently a multi-step procedure will be used for... 

The flame retardant mechanism of PC/ABS compositions using bisphenol A bis(diphenyl phosphate) (BDP) and zinc borate have been investigated (54). BDP affects the decomposition of PC/ABS and acts as a flame retardant in both the gas and the condensed phase. The pyrolysis was studied by thermogravimetry coupled with fourier transform infrared spectroscopy (FUR) and nuclear magnetic-resonance spectroscopy. Zinc borate effects an additional hydrolysis of the PC and contributes to a borate network on the residue. 

Keywords Alkoxysilanes hydrolysis Fourier transform infrared spectroscopy. 

Regarding the spatial aspects of the enzymatic degradation of CA-g-PLLA, a surface characterization [30] was carried out for melt-molded films by atomic force microscopy (AFM) and attenuated total-reflection Fourier-transform infrared spectroscopy (ATR-FTIR) before and after the hydrolysis test with proteinase K. As exemplified in Fig. 3 for a copolymer of MS = 22, the AFM study showed that hydrolysis for a few weeks caused a transformation of the original smooth surface of the test specimen (Fig. 3a) into a more undulated surface with a number of protuberances of 50-300 nm in height and less than a few micrometers in width (Fig. 3b). The ATR-FTIR measurements proved a selective release of lactyl units in the surface region of the hydrolyzed films, and the absorption intensity data monitored as a function of time was explicable in accordance with the AFM result. 

Transition metal coordination of Cu(II) carboxylate groups and pyridine groups was employed as a means of coupling a telechelic butadiene-base polymer with a randomly functionalized styrenic polymer. Dynamic mechanical analysis (DMA) and differential scanning calorimetry (DSC) indicated partial miscibility of the two polymers and Fourier transform infrared (FTIR) spectroscopy demonstrated that interactions occurred on a molecular level. When compared with blends of PSVP and the free acid derivative of CTB, the compositions based on the transition metal complex had improved dimensional stability at elevated temperatures, though there remains some question as to the stability of the copper salt to hydrolysis. Electron spin resonance (ESR) spectroscopy showed that only the... 

PBX-9404 (94% HMX, 3% NC, 3% CEF) was chosen as the base material for hydrolysis, since much of the prior research by LANL was with this explosive formulation. Analysis of the base hydrolysis products required the use of several instruments and techniques including Fourier transform infrared, nuclear magnetic resonance, and mass spectrometers. Product identification included gas, liquid, and solid products. 

Although it will be discussed in more detail later, it is important to note that treatment of oxiranes with aqueous acid (H3O ) results in protonation of the oxygen of the epoxide and ring opening in an ""anti-" or an antarafacial fashion with production of the corresponding diol. Thus, in contrast to the results of permanganate (MnOi) and osmium tetroxide (OsOd oxidation of alkenes, this two-step process (epoxidation followed by aqueous acid hydrolysis) yields the (E)- or trans-diol (Equation 6.20). The H NMR and Fourier transform infrared (FT-IR) spectra for cyclohexene and the (E)- and (Z)-diols are shown in Figure 6.4. 

Balfe et al. [115] combined Raman and Fourier transform infrared spectroscopy to determine the hydrolysis behavior of model linear and cyclosilicate compounds under neutral conditions. They observed that all linear as well as cyclotetra- and cyclopentaorganosiloxanes (which have little or no bond strain resulting from reduced Si-O-Si bond angles, 0, or... 

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