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N-th Order Kinetics model

The n-th order reaction kinetics (Kamal model) is used to calculate the curing behavior of a thermoset material in the following analyses:

  • Reactive Molding
  • Microchip Encapsulation
  • Underfill Encapsulation
  • Chemical Foam Molding analysis

The n-th order reaction kinetics model is given by the equation:

nth order kinetics where

  • degree of cure is the degree of cure (0-1),
  • temperature is temperature (K),
  • time is time (s),
  • K1
  • K2
  • and where constant m, constant n, constant A1, constant A2, constant E1 and constant E2 are constants.

The model also includes induction time. Some materials undergo an induction period before curing starts to take place. The length of this induction period (induction time) can be calculated from the following equation:

induction time eq

where

induction time is the induction time,

temperature T is temperature (K),

constant B1 (s), and constant B2 (K) are constants associated with the induction time, induction time tz.

During curing kinetics measurement, the heat of reaction is also measured. The heat of reaction is represented by heat of reaction (J/kg).This heat of reaction appears on the Reaction Kinetics Properties tab of the Thermoset material dialog.

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