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Terminal Model Revisited

Let s start by considering the probability of adding an A to a growing chain end that also has an A as its terminal group. This is simply (Equation 6-46)  [Pg.156]

The other two independent conditional probabilities, P A/B and P B/A are now readily obtained from (Equations 6-50)  [Pg.156]

We can now derive the copolymer equation from these simple conditional probabilities. [Pg.156]

Terminal Group Added Group Rate Final Product [Pg.156]

We can express % (a measure of the departure from randomness) and the other parameters we have defined in terms of both conditional probabilities and then reactivity ratios and molar feed ratios. For example, % is given by Equation 6-53  [Pg.157]


Regarding the question of alternative copolymerization kinetic models, as mentioned earlier, in the event of discriminating between competing models (e.g., terminal model kinetics vs penultimate model kinetics), a set of equidistant monomer feed compositions along the entire composition range can serve as an appropriate design of experiments. Once one has determined that an alternative model is operative, the same four questions noted for the terminal model above should be revisited. There are several examples of the estimation of penultimate unit kinetic parameters in the literature [125, 112]. [Pg.115]


See other pages where Terminal Model Revisited is mentioned: [Pg.156]    [Pg.156]    [Pg.78]   


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