Scaling laws between the hydrodynamic parameters and molecular weight of linear poly(2-ethyl-2-oxazoline)

Abstract

Scaling laws between the hydrodynamic parameters and molecular weight of linear poly(2-ethyl-2oxazoline)3

Synthesis and Conformational Characteristics of Thermosensitive Star-Shaped Six-Arm Polypeptoids

“…The values of ¯ for investigated stars differed slightly ( Table 1). The obtained values of ¯ for the CPh6-PEtOx are close to those reported in the literature for linear PEtOx, to reported values from Schubert and Nischang et al [26] of ¯ = 0.84 cm 3 g −1 , from Ye et al [42] of ¯ = 0.85 cm 3 g −1 , and ¯ = 0.87 cm 3 g −1 from Chen et al [43]. In addition, the specific partial volumes for CPh6-PAlOx are in good agreement with the values of ¯ for star-shaped PEtOx and PiPrOx [44][45][46].…”

Viscosity Measurements of Dilute Poly(2-ethyl-2-oxazoline) Aqueous Solutions Near Theta Temperature Analyzed within the Joint Rouse-Zimm Model

“…The equation gives = 20.8 nm, close to the Zimm value 19.4 nm at ℎ → ∞. Both these values lie in the interval of from 18.0 nm to 24.7 nm, obtained from the dependence of the hydrodynamic radius on molecular weight, as it was empirically determined for PEOX polymers in [43], with the use of a combination of analytical ultracentrifugation and laser light scattering (note that the scaling law found in [43] again indicates that PEOX polymers adopt a random coil conformation in aqueous solution at room temperatures). Within the joint Rouse-Zimm theory for a finite ℎ it holds 1/2 / = 8/3 + 2 1/2 /ℎ, so that one obtains a lower value = 16.4 nm.…”

Characterization of mixed solutions of hyperbranched and linear polystyrenes by a combination of size‐exclusion chromatography and analytical ultracentrifugation

“…However, only a few research studies have been done to characterize polymers by a combination of SEC and AUC. Previously, we have used this coupled method to investigate the scaling laws between the sedimentation coefficient and the molar mass of a series of linear poly(2‐ethyl‐2‐oxazoline) . In this study, we mainly used this combined method to separate polymers with different topologies, that is, linear and hyperbranched polystyrenes.…”

“…[18] In addition to liquid chromatography, analytical ultracentrifugation (AUC) is also a good tool for separation of solutes based on the molar mass and the size of the solutes in solutions. [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] It has been widely used to characterize polymers and nanoparticles, [19][20][21][22][23][24][25][26] proteins, [27][28][29][30] and DNA. [31][32][33][34][35] However, only a few research studies have been done to characterize polymers by a combination of SEC and AUC.…”

“…Previously, we have used this coupled method to investigate the scaling laws between the sedimentation coefficient and the molar mass of a series of linear poly(2-ethyl-2-oxazoline). [23] In this study, we mainly used this combined method to separate polymers with different topologies, that is, linear and hyperbranched polystyrenes. In the first dimension separation, SEC was used to separate the polymer mixtures according to the hydrodynamic volume, and in the second dimension separation, AUC was used to fractionate and characterize the polymers mainly with respect to the molar mass.…”