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13 (provided that a value of 19,124 g/mol is taken as [bar.M.sub.n0], in place of the actual value of 19,760 g/mol, to account for the lower initial torque), which can be associated with the esterolysis reaction of PEN.
On the contrary, the experiments done by adding B into PET showed that esterolysis reactions are much slower.
Other reactions such as acidolysis, alcoholysis and esterolysis are disregarded for simplicity.