Differential Thermal Analysis Apparatus.

Abstract

fore, a theoretical injection time was established from the CI peak by comparison with C, injections. Retention times were then calcu1:tted relative to the C, peak.Reproducibility of Pyrolysis. Early in the investigation the reproducibility of the cracking procedure was determined. Separations were made on a 1-meter dinonyl phthalate column. Eight consecutive runs were made on a copolymer containing 15 wt. methyl acrylate. Peak areas were determined relative to the CT peak. The results are shown in Table 11. Separation Procedure. The precut column was sized to pass pyrolyzates np to Clo hydrocarbons in 4 minutes.The ODPN column then selectively retained the polar tcomponents such that the Clo peak eluted before methanol. Since all the materials boiling above Clo were retained by the precut column and back-flushed, the alcohol and estrr peaks were? free from inter-Di f f e re n ti CI I The r m a I

Polymer analysis by thermofractography

“…ABS-terpolymers, yield characteristic pyrograms and even modified polymer components present in low concentration can be detected 8 ' 71,4s, 54,62, 70,64, 56), Of the vinyl polymers which interest us (see Chapter V.4.3. ), poly-acrylates46, 60,62,68,167,168), polyalkylacrylatesS4, s6, 68,[165][166][167]169) and polyvinyl carboxylates46, s4, s6,68,165) have been subjected many times to pyrolysis-GC and the pyrograms thus obtained used for characterisation. Supplementary information can be obtained from direct IR-spectroscopic study of the vinyl polymers and IR-identification of their pyrolysates s' 8).…”

Coatings

“…A report is available (38) on the application of pyrolytic gas chromatography to the analysis of thermosetting acrylic coating resins. A technique for determining polymer ratios of poly (ethylene ethyl acrylate) and polyethylene vinyl acetate) from pyrolyzates was described (10). An extensive investigation of polymer characterization by the application of pyrolytic gas chromatography was presented by Groten (41), in which the identification of 150 polymers was described and quantitative data for some of the cellulosics and styrene in vulcanizates were given.…”

Thermal Analysis

“…A number of equipments have been described. They include low temperature equipment for temperature ranges from -50°to 100°( 79) and -100°to 500° ( 11); borosilicate glass tube sample holders, etc., for studying propellant systems (187); equipment for use with toxic compounds (156); apparatus for thermal and differential thermal analysis to 1500° ( 78); and controlled atmosphere and vacuum equipment (231). Apparatus for simultaneous DTA and gas evolution analysis has been developed by Wendlandt (229).…”