The degree of reaction of glycidyl epoxy ring along the curing cycle selected was obtained from the infrared spectra. A peak-height method based on the ratio of the height of the characteristic to reference absorbance peak was used. The curing kinetic of different blends was obtained by ...
In the first decomposition step of all four investigated samples, the FTIR spectrum is dominated by rotational-vibrational bands in the region 2200–2400 cm−1 and an intense band at 668 cm−1. These bands clearly indicate CO2. Minor absorbances are observed in the region 900–1800 ...
All spectra are normalized to the peak absorbance value of the internal standard (AIS, located at wavenumber 2120 cm−1). The normalized height of the soil samples’ main absorption peak (at 1035 cm−1) decreases steadily as the firing temperature is increased from 150 to 900 °C (see ...
It is clear that the absorbances of the groups, especially C–H, CO, and C–O–C groups, increased significantly as the heating condition increased due to increase in the generated heat flux and all the complex organic molecules decomposed into hydrocarbons compounds [46,48,49]. These ...
The influence of the hardener/resin ratio, temperature, and curing time have been determined. This article discusses which bands of the infrared spectrum and what relation of their absorbances are most convenient to monitor the resin-curing process....
Two explanations accounting for this faster degradation in the first hours of exposure are drawn from ultraviolet absorbance analysis and degradation mechanisms considerations. After 40 h of irradiation, the disappearance rate of the aromatic groups depends only on their initial concentration, whereas the...
Two explanations accounting for this faster degradation in the first hours of exposure are drawn from ultraviolet absorbance analysis and degradation mechanisms considerations. After 40 h of irradiation, the disappearance rate of the aromatic groups depends only on their initial concentration, wher...
The following equation allows quantification of H2O in silicate glasses that range in composition from basalt to rhyolite: wt% H2O = (ωA3450/ρ) + b where ω = 550 ±21, b = -0.19 ± 0.03, ρ = density, in g/cm, and A3450 is the ATR absorbance at 345...
Trying to remove the contribution of the casting resin from the spectra or from an absorbance map, for example by subtracting or deconvolving the reference spectrum of the casting resin is not the best solution. This is because the operation can remove some of the overlapping peaks that belong...
another application of FTIR in composites quality control is the determination of resin and hardener mix ratio. This can be done with liquid resin just after mixing or on a cured part. As mix ratio changes the hardening reactions will perform differently. Absorbance peaks of reactive bonds will ...