Thermogravimetric analysis sample examination

We have examined temperatured-programmed desorption (TPD) and thermogravimetric analysis (TGA) of isopropyiamine on a series of Si-, Co-, and Mg-substituted AIPO-5 samples. The TPD-TGA results on the substituted samples show ammonia and propene desorbing in a well-defined feature between 575 and 650K, a feature not observed on pure AIPO-5. The results suggest that TPD-TGA measurements of isopropyiamine may be useful in determining the framework concentrations and acid site densities for SAPO-5, CoAPO-5, and MAPO-5. 

Characterization of Polymers. The characterization of polymers Ifi - 21 was mainly spectroscopic in nature, FTIR and NMR, but some thermal analyses were also performed. The thermal analyses consisted of differential scanning calorimetry, DSC, and thermogravimetric analysis, TGA. Although the thermal analyses were in no way exhaustive, a few interesting features were found in the different polymers. The molecular weights of samples were examined by GPC and are based on polystyrene standards. 

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