Influence of branching regularity on the behavior of hyperbranched polymers in solution

Abstract

The molecular and hydrodynamic properties of carbosilane pseudo‐dendrimer are investigated. The comparison with solution behavior of analogues, namely, hyperbranched polymer and “perfect” dendrimer, are carried out.

“Hard” Sphere Behavior of “Soft”, Globular-like, Hyperbranched Polyglycerols – Extensive Molecular Hydrodynamic and Light Scattering Studies

“…The statistical "density" of the A 0 values is reflected by the color intensity in Figure 4 (see the "density" bar) and shows that the majority of the experimental values of A 0 calculated over the entire set of the available literature data are, as a rule of thumb, found to be A 0 = (2.6 ± 0.4) × 10 −10 [g cm 2 s −2 K −1 mol −1/3 ]. 18,23,29,31,32,57,[60][61][62]64 Up to now, we believe that this is the most completed experimental value for the basically all-inclusive family of branched polymer systems. An experimental error of ±0.4 corresponds to an approximately 20% error of the sample molar masses.…”

“…1,16,19 The combination of classical hydrodynamic methods such as (intrinsic) viscosity measurements, sedimentation velocity analysis by analytical ultracentrifugation (AUC), and the fundamental translational diffusion studies have rarely been applied for hyperbranched macromolecular structures in solution in a systematic and combined manner. 29,31,32 Our previous research that is related to hyperbranched poly-(ethylene glycol) copolymers 31 introduced the concept of hydrodynamic homology, which basically assumes indifferentiability in the scaling behavior of all basic hydrodynamic characteristics vs the molar mass − the situation that is typical for structural homologies with the known repeating unit.…”

“…The study of related macromolecular systems comprises hyperbranched polystyrenes, − poly­(pyridyl-phenylene)­s, or glycogens of natural origin in typically utilized organic solvents. The predominant analytical techniques employed to study branched or hyperbranched macromolecular structures in solution are light scattering and solution viscometric studies. ,, The combination of classical hydrodynamic methods such as (intrinsic) viscosity measurements, sedimentation velocity analysis by analytical ultracentrifugation (AUC), and the fundamental translational diffusion studies have rarely been applied for hyperbranched macromolecular structures in solution in a systematic and combined manner. ,, Our previous research that is related to hyperbranched poly­(ethylene glycol) copolymers introduced the concept of hydrodynamic homology, which basically assumes indifferentiability in the scaling behavior of all basic hydrodynamic characteristics vs the molar mass – the situation that is typical for structural homologies with the known repeating unit.…”

Multiarm Star-Shaped Polydimethylsiloxanes with a Dendritic Branching Center

“…Changes in the shape of diffusion attenuation were not observed for t d in the range of 100–500 ms. Thus, the restricted in-cage motion, which is characteristic of the behavior of colloidal suspensions [ 26 ], was not observed on the considered timescale. On the other hand, the appearance of nonexponential diffusion attenuations in melts contrasted the exponential attenuations in diluted solutions, indicating the presence of dynamical heterogeneities.…”

“…The boundary between low-arm stars that belong to branched polymers and multiarm stars can be determined using the α coefficient of the Mark–Kuhn–Houwink equation [η] = K η M α . Its magnitude and, more importantly, the absence of the dependence of its magnitude on the molecular weight of the arm within the experimentally obtained values make it possible to unambiguously refer to the new objects as one or another classification group [ 23 , 24 , 25 , 26 ]. If a star-shaped polymer has a number of arms f > 30, the value of the α coefficient decreases with the number of arms to very low values for such systems (at f > 100, α = 0.06) [ 24 ], which characterizes the object as a rigid and compact globule.…”