Layers of Distinct Mobility in Densely Grafted Dendrimer Arborescent Polymer Hybrids
Panagiotis Kardasis1, Nikolaos Kalafatakis2,3, Mario Gauthier4
1Department of Physics, University of Ioannina, 45110 Ioannina, Greece.
Abstract:
Melts of multiarm stars of 1,4-polybutadiene (dendrimer arborescent hybrids) with very high branching functionality (f) and small arm molar mass behave as jammed colloids and show distinct layers of segmental mobility. Three mobility layers were identified, comprising outer, intermediate, and near-core segments, all displaying a Vogel-Fulcher-Tammann temperature dependence. The respective glass temperatures increase as f^{1/2}. Our findings pave the way for further progress in this field by reconsidering previous theoretical treatments based on a single friction coefficient in hybrid nanoparticles such as densely grafted stars.
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