Hydrodynamic and Optical Properties of Homologous Series of Styrene-Methyl Methacrylate Graft Copolymers

Molecular characteristics of poly(propylene imine) dendrimers as studied with translational diffusion and viscometry

“…The thermodynamic quality of the solvent may change on passing from one generation to another, and the h conditions not will be the same for the different generations likes the behaviour of short- (Figs. 2, 3) branched comblike molecules and star molecules [51][52][53]. The contributions of these effects can change depending on the number of end groups.…”

“…4 The dependence of the Huggins parameter k¢ on the number of end groups in DAB dendrimers: 1 DAB-dend-(CN) x , 2 DAB-dend-(C15) x , 3 DAB-dend-(lacto) x [29,30] dendron (L ¼ 25 · 10 )8 cm) comparable with the Kuhn segment length. It is necessary to take into account a possible increase in the equilibrium rigidity, A, caused by the interaction between side chains [8,29,53] in the dendron and by electrostatic interaction [55], which can lead to l/A ( 1. This implies that the increase in the hybrid dendrimer size due to core swelling is unlikely and that to a first approximation all changes can be considered to be caused by the contribution of end groups.…”

Hydrodynamic and Molecular Study of Poly{4‐[4‐(hexyloxy)phenyl]ethynylphenyl methacrylate} in Dilute Solutions and Conformational Peculiarities of Brush‐Like Macromolecules

“…It is interesting to compare the macromolecular size of different comb‐like polymers studied earlier: poly(lauryl methacrylate),5 graft polystyrene,77 graft copolymers of poly(methyl methacrylate) and polystyrene,8, 9 graft polymers resulting from the reaction of the poly( m ‐halomethylstyrene) backbone with polystyrene,78 poly( n ‐alkyl methacrylates),11 poly(fluoroalkyl methacrylate)s,79 poly[ N ‐octadecylmaleimide],75 polystyrene macromonomers,80 poly( ω ‐norbornenylpolystyrene) polymacromonomers,81 cylindrical dendrimers based on L ‐aspartic acid,82, 83 arborescent graft polybutadienes,84 and PHPhEPhM studied in this paper. For this purpose, the approach proposed earlier85 can be used, which does not require a priori knowledge of any hydrodynamic parameters and deals only with the experimental values (molar mass and intrinsic viscosity).…”

“…There are different classes of brush‐like (comb‐like) macromolecules, for instance: (1) macromolecules having non‐interacting side‐groups, such as graft copolymers of poly(methyl methacrylate) and polystyrene, alkyl acrylates or alkyl methacrylates,5–10 (2) macromolecules having side groups, which can specifically interact, in particular side groups containing the mesogenic fragments or liquid‐crystal fragments,11–13 and (3) proteoglycans, which are brush‐like biomacromolecular systems with very dense packing of the side chains 14–16…”

“…The first comb‐shaped polymers were synthesized, starting in the 1950s to 1960s, their properties in solution and in the bulk were extensively studied experimentally5–13, 17–19 and theoretically 20–24…”