Tacticity sequence statistics in vinyl polymers

At the next level of complexity, the first-order Markov level (see chapter 2), 

only two of the probabilities are independent. For simplicity, the independent probabilities are defined as w = P r) Ar m) ll sequence 

Higher-order Markov models can also be applied [65]. In second-order Markov statistics, the probability of forming m or r depends on the structure of the previous two dyads. There is a total of eight conditional probabilities, of which four are independent. In order to confirm that this model is correct, it is necessary to have accurate pentad probabilities or longer. 

Other propagation models are also possible. An example is an adaptation [48,55,65] of the Coleman-Fox [66] mechanism in which the polymerisation is considered to take place at two active sites, each with a different Bernoullian propagation probability (see chapter 2). 

---