Euler-Romberg integration method

The concentration of each chemical species, as a function of time, during cure can be calculated numerically from Equations 3-6 using the Euler-Romberg Integration method if the initial concentrations of blocked isocyanate and hydroxyl functionality are known. It is a self-starting technique and is generally well behaved under a wide variety of conditions. Details of this numerical procedure are given by McCalla (12). 

Each trial curve generated by the Euler-Romberg integration method is similarly normalized by dividing each of its points by a value corresponding to the time at which the experimental curve reached its maximum. 

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