Transport Coefficients of Poly(diisopropyl fumarate) in Dilute Solution

Abstract

Top of pageAbstract The intrinsic viscosity [η] was determined for 13 samples of poly(diisopropyl fumarate), each with the fraction of racemo diads fr = 0.22, in the range of weight-average molecular weight Mw from 4.02 × 104 to 8.59 × 105 in tetrahydrofuran at 30.0 °C. The translational diffusion coefficient D was also determined from dynamic light scattering measurements for 12 of them in the range of Mw from 4.95 × 104 to 8.59 × 105 under the same solvent condition. The data so obtained were analyzed on the basis of the corresponding transport theories for the unperturbed Kratky–Porod (KP) wormlike cylinder model combined with the quasi-two-parameter theory for the intramolecular excluded–volume effect. It is shown that the experimental values are in quantitative agreement with the perturbed KP theory ones by the use of the model parameter values consistent with those determined previously from analyses of the mean-square radius of gyration (S2) and second virial coefficient A2. An examination was also made of behavior of the Flory–Fox factor Φ and reduced hydrodynamic radius ρ−l as functions of Mw. Keywords: Poly(diisopropyl fumarate), Intrinsic Viscosity, Translational Diffusion Coefficient, Kratky–Porod Wormlike Chain Model, Excluded-Volume Effect, Quasi-Two-Parameter Theory