ISSN:
0021-8995
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
We describe here a relatively new analytical method1-3 for following the thermal reaction history of polymers by quantitatively detecting the evolution of gases and some volatiles by flowing-afterglow spectroscopy. The thermal and oxidative stability of common plastics in many industrial and defense applications is of wide interest. We have studied the evolution of moisture and carbon dioxide from Li2CO3/Orlon-filled diallyl phthalate (DAP) composites and have briefly examined the thermal stability of Estane 5703, a polyester-based thermoplastic polyurethane. The results of these preliminary studies have shown the utility of FLAG spectroscopy as a means toward our understanding polymer stability and lifetimes in specified environments. FLAG data, combined with differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) data, have extended our knowledge of Li2CO3/Orlon/DAP and Estane aging processes. The DAP composites evolve H2O and CO2 at near ambient temperatures, and we have described the kinetics of gas evolution and have attempted to describe the mechanism of thermal degradation. In the 25-120°C temperature range Estane 5703 evolves CO2 as a decomposition product and some adsorbed moisture.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/app.1982.070270211
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