Many papers i was read for solving this calculation but i can not understand the calculation. So please tell me the answer or give any model calculations about this question.
Dear Sathiskumar,
The following publication describes all available methods and the parameters to be calculated in a very clear manner. I have copied some text for quick view:
METHODS OF ANALYSIS
Most polymers degrade in a highly complex manner. These complex degradation
mechanisms are generally not understood sufficiently to formulate exact analytical
expressions.
Therefore, empirical homogeneous kinetics are normally used to describe the degradation.
The thermal degradation mass-loss reactions, if assumed to be irreversible, may
be described by the form of the psuedo-order classical rate expression.
EQUATIONS 1-4.
The kinetic parameters - activation energy E, frequency factor A, and order n - may be determined from this rate equation by using thermogravimetric-analysis data. There are numerous techniques for evaluating these parameters. The five methods used in this paper are representative of the different techniques in current use and are described in detail in appendix A.These methods are as follows: (1) Direct-solution method, (2) Integral method, (3) Maximum-decomposition method, (4) Multiple -heating-rate method, and (5) Difference method. These methods are as follows: (1) Direct-solution method, In order to determine the kinetic parameters E and A by the direct-solution,
To view the whole text along with the appropriate figures and equations, please use the following link:
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19670013969.pdf
Hoping this will be helpful,
Rafik
Differentiate the mass lass with respect to temperature and calculate the area under curve... Thist technique is widely used in understanding the folding/unfolding mechanisms of protein
Dear Sathiskumar
There is a software, you can calculate the activation energy in a just a few seconds, its name is AKTS (Advanced Kinetic and Technology Solution) all what you need is to load your different heating rates TGA or DSC curves ( heating rates should be below 8 K/min i.e. 1, 2, 4, 6 ,8 K/min)
http://www.akts.com/
However, if you still interesting in calculating the Ea using Excel, please let me know
Hope this helping
Have a very good day
Ahmed
- Badges
- Science topic
- Similar topics
- Papers