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Entanglement Transition in Hyperbranched Polyether‐Polyols
Author(s) -
Tonhauser Christoph,
Wilms Daniel,
Korth Yasmin,
Frey Holger,
Friedrich Christian
Publication year - 2010
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201000473
Subject(s) - molar mass , branching (polymer chemistry) , quantum entanglement , polymer chemistry , viscoelasticity , polymer , polymerization , molecular mass , molar mass distribution , scaling , molecular dynamics , materials science , shear viscosity , intrinsic viscosity , polymer science , viscosity , chemistry , computational chemistry , composite material , physics , organic chemistry , geometry , mathematics , quantum mechanics , quantum , enzyme
Are hyperbranched polymers capable of forming entanglements? This is the central issue of this contribution. Hyperbranched polyglycerol ( hb PG) samples with different molecular weights (600–106 000 g · mol −1 ), narrow polydispersities (1.2–1.8) and high degrees of branching (≈0.6) were prepared by anionic ring‐opening polymerization. The viscoelastic properties of these polymers with respect to molecular architecture and molar mass were investigated. At low molecular weights “classical” scaling behavior between zero shear viscosity and molecular weight can be observed, whereas between 3 000 and 10 000 g · mol −1 a plateau‐like area is found. The results indicate entanglement dynamics when exceeding a critical molar mass ( $\overline {M} _{{\rm c}}^{*} $ ≈ 20 000 g · mol −1 ) due to entangled hyperbranched polyglycerols.