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The rank of Lower Cretaceous Baganuur coal from Mongolia ranges from lignite to subbituminous coal, indicating transition from biochemical to physico-chemical coalification stages. The changes in the chemical structure of coal were studied using solid-state C-13 CP/MAS NMR. The predominant change du
Thermal dehydration process of PMAA was investigated by solid-state 13 C NMR. For heat-treated PMAA at 150ยฐC, at which the dehydration goes very slowly, we observed three 13 C peaks at 172, 178, and 187 ppm in the carboxyl group region. The peak at 172 ppm is due to the intramolecular cyclic anhydri
13 C labeling was used to enhance the sensitivity of 13 C solid-state NMR to study the effect of tabletting on the polymorphism of a steroidal drug. The steroidal drug Org OD 14 was 13 C labeled and formulated into tablets containing only 0.5-2.5% active ingredient. The tablets were subsequently
Using differential scanning calorimetry, we have investigated three difunctional cyanate monomers differing by their central group: bisphenol A dicyanate (BADCy), bisphenol E dicyanate (BEDCy), and hexafluorinated bisphenol A dicyanate (BAFDCy), to determine the effect of the central group on the mo