while for rodlike polymers α = 2 [41]. van Krevelen [41] also provides some criteria to estimate α, which is based on the solubility parameters of the polymer and the solvent.
while for rodlikepolymers α = 2 [41]. van Krevelen [41] also providessome criteria to estimate α, which is based on the solubilityparameters of the polymer and the solvent.