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Estimation of the storage life of dimethylol urea using non-isothermal accelerated testing
- Publication Year :
- 2011
- Publisher :
- Springer Verlag, 2011.
-
Abstract
- The mechanism and stability of dimethylol urea (DMU) to polycondensation were investigated using thermogravimetric analysis coupled with mass spectroscopy (TG-MS) for evolved gas analysis and a non-isothermal model-free induction period kinetic analysis using three temperature functions; the Arrhenius function and two non-Arrhenian functions. The polycondensation was observed to occur through a two-step process of condensation followed by elimination of formaldehyde during structural rearrangement as has been reported in the literature. The rate equations for each temperature function were evaluated and extrapolated to room (23 °C) and refrigerator (4 °C) temperature to estimate the length of the induction period for the onset of polycondensation for storage life prediction. Based on experience, estimates of the length of the induction periods and, hence, storage life, were most realistically predicted by the non-Arrhenian temperature functions.
- Subjects :
- Thermogravimetric analysis
Condensation polymer
Evolved gas analysis
Chemistry
Induction period
Condensation
Formaldehyde
Thermodynamics
Rate equation
Condensed Matter Physics
Physical Chemistry
Isothermal process
chemistry.chemical_compound
Polymer chemistry
Physical and Theoretical Chemistry
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....27b7b3dc65e65d6b2927d23aeae2ddb0