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Ebi
17th April 2004 - 09:33 PM
Hi! Actually I have found a paper about thermal degradation of PMMA.
In that paper activation energies for first, second and third
degrdation peaks have been calculated by Fridman method. Intrestingly
activation energy for first peak (H-H linkages) shows higher
value(130kJ) than second peak (non saturated bonds)(125kJ). But
degradation temperature for first peak is 400°K while for second peak
the value is 500°K. How come? Why is activation energy for second peak
not higher since degradation temperature of second peak is much
grater?

Can you give me some information
I appreciate
Michael Dahms
17th April 2004 - 09:33 PM
Look to the mathematical fundamentals of the Friedman method!
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