Thermal volatilization analysis of high polymers

✍ Scribed by I.C. McNeill

• Publisher: Elsevier Science
• Year: 1967
• Tongue: English
• Weight: 659 KB
• Volume: 3
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(67)90011-0

✦ Synopsis

In thermal volatilization analysis, the small pressure which exists in a continuously evacuated system between a hot sample, decomposing to volatile products, and a cold trap placed some distance away is recorded continuously as the temperature of the sample is increased in a linear manner. The thermograrn indicates the variation of rate of volatilization of the sample with temperature. The apparatus required is discussed in detail, and the problems of temperature calibration, control of sensitivity and the factors affecting the pressure gauge response are examined. A number of applications of TVA are considered, including the identification of rubbers, the change in thermogram on vulcanization of natural rubber, and the simultaneous recording of thermograms for total volatiles and noncondensable volatiles for the same sample. Cases are considered in which different heating rates have very little, or very great, effect, respectively, on the TVA thermogram.