I have read your PhD thesis but there is some background I am missing.
What represented the need for modelling originating from the characterization of the behaviour at a molecular scale ( 8 chains, the treatment of reptational dynamics in yours model, etc.)?
In other words, what can not be captured by a sufficiently complex viscoelastic model? A witty answer could be that such a complex model can not exist, but I am sure you have a much deeper explanation, for which I would be the most grateful.
Have a nice weekend and my apologies if the frequently (excessively?) abstract nature of my queries clashes with the general style of this forum, whicj I evidently enjoy a lot.