RESUMEN
Solid state transformation of crude poly (ethylene terephthalate)(PET) and PET/nano-CaCO3 (MPET) composites were studied by variable temperature FTIR spectroscopy during the heating process from 40 to 250 degrees C. The effects of nanometer calcium carbonate(nano-CaCO3) on the solid state transformation and crystal correlation bands of MPET composites were analyzed by the curves of the ratio of 1 342 and 1 410 cm(-1) absorbency(A1 342/A1 410) with temperature increasing, and together with DSC curves in the same condition. The results showed that the crystallization degrees of crude PET and MPET are obviously different in this condition by adding nano-CaCO3 particles as inhomogeneous nucleating agents.
RESUMEN
Variable temperature FTIR spectra method was used to study the crystalline spectra of crystal compounds. In the present paper, the sample of L-LA was synthesized and characterized by FTIR, NMR and DSC. It was found that the two peaks in therange of 800-770 cm(-1) changed sharply at 95 degrees C after being investigated by FTIR spectra between 15-120 degrees C. When the temperature increased, these peaks remained almost unchanged, but they returned to the original state after annealing. It was deduced that these two peaks are linked to the crystalline of L-LA.
Asunto(s)
Ácido Láctico/química , Polímeros/química , Espectroscopía Infrarroja por Transformada de Fourier/métodos , Temperatura , Cristalización , Ácido Láctico/síntesis química , Espectroscopía de Resonancia Magnética , Poliésteres/química , Polímeros/síntesis químicaRESUMEN
The title complexes shown as cationic fenugreek gum were prepared. The thermal decomposition process of fenugreek gum and cationic fenugreek gum was studied quantitatively by means of thermogravimetric analysis an dinfrared spectroscopic measurement of samples after heating at different temperatures. Additionally, according to the fact that the absorbance peak changes and theanalysis of TG-IR of cationic fenugreek gum at different temperatures, it can be drawn that the thermal decomposition of the cationic fenugreek gum might lead to a possible thermal-cracking process.
Asunto(s)
Polisacáridos/análisis , Espectrofotometría Infrarroja/métodos , Trigonella/química , Cationes/química , Estructura Molecular , Polisacáridos/química , TemperaturaRESUMEN
The Bis (diphenylphosphino) alkane series ligands and its series of complexes formed from Cu(BF4)2 and Cu(C3H7COO)2 respectively were studied by infrared spectral analysis. This paper discusses the spectral classification and the change regularity of related spectra before and after the Cu(I) complexes were formed. The possible structure model of the formed complexes was discussed, based on the element analysis, powder X-ray diffraction analysis, and thermal gravity analysis.
Asunto(s)
Boratos/química , Butiratos/química , Cobre/química , Compuestos Organofosforados/química , Compuestos de Boro/química , Quelantes/química , Fenómenos Químicos , Química Física , Modelos Químicos , Estructura Molecular , Compuestos Organometálicos/química , Espectrofotometría Infrarroja , Espectroscopía Infrarroja por Transformada de FourierRESUMEN
The miscibility of CPP with alkyd resin in the specified mixing ratios has been studied by FTIR spectra. The results obtained indicate that the bands of hydroxyl groups noticeably shifted in the FTIR spectra of the blends in contrast with the infrared spectrum of alkyd resin, and the blends were miscible when the weight fraction of alkyd resin in the blends of CPP and alkyd resin was less than 0.5, and immiscible when greater than 0.5, which were proved by the glossiness of their films.
