Differential Thermal Studies with Simultaneous Gas Evolution Profiles

Effects of exposure of chloroquine picrate to the sun: A differential scanning calorimetric study

“…1). This property makes organic compounds with a high proportion of nitro groups excellent explosives [4]. This property makes organic compounds with a high proportion of nitro groups excellent explosives [4].…”

Thermal Analysis

“…Fluorescence under ultraviolet light was used to identify some of the condensates. Vassallo ( 217) discussed pyrolysis of polymers and suggested that mass spectrometry and thermal conductivity could be employed for analysis of gaseous products evolved, a method proved to be successful in DTA (7,90,229). Infrared analysis (5, 39, 67, 97) and x-ray diffraction have been found particularly useful in identification of stable phases found in TGA.…”

“…Vassallo (217) has generalized that isothermal pyrolysis of polymers in N2 is about 10°h igher than in vacuum, while a programmed temperature rise can produce a difference as high as 50°to 60°. However, Anderson (7) stated that although TGA measurements may not be as accurate and as precise as isothermal gravimetry for kinetic experiments, they are less time-consuming and probably give more representative values for the pyrolysis of complex substances such as cross-linked epoxide polymers. A plot of In In wjw vs. gives a straight line with a slope of E/RTS-The method was applied to dehydration of CaC204 H20 and reasonable agreement with previous results (85) was obtained.…”

“…Apparatus for simultaneous DTA and gas evolution analysis has been developed by Wendlandt (229). The measurement of gas evolution is made by thermal conductivity measurement of a carrier gas (He), a technique previously described (7,92). Similar equipment has been used by Chamberlain and Green (42).…”

Effluence Analysis as an Aid to Thermal Analysis

“…The technique of Rogers, Yasuda, and Zinn (10) has some distinct advantages. A continuous plot is obtained, but the composition indication is no better than that of Ayres and Bens (1). The desire for information concerning thermal effects might lead the hasty reader to ignore the possibilities.…”