caa a22 4500 605466483 CHVBK 20210128100307.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00397-014-0827-6 doi (NATIONALLICENCE)springer-10.1007/s00397-014-0827-6 Onset of entanglement and reptation in melts of linear homopolymers: consistent rheological simulations of experiments from oligomers to high polymers [Elektronische Daten] [Fabio Zulli, Marco Giordano, Laura Andreozzi] The shear rheological behavior is investigated in this work for a series of poly(ethyl acrylate) samples, whose molar mass ranges from oligomers to high polymers. The focus was on studying the onset of entanglement effects over selected reptation models in order to ascertain their ability to reproduce the complex shear modulus of the polymers and to provide consistent values of the microscopic parameters driving the structural relaxation of the polymer system. Among ordinary reptation topological models, we found that the Doi-Edward model, implemented with contour length fluctuation and constraint release mechanism for the tube relaxation, better reproduced the rheological response of the materials. Most importantly, we were able to simulate material functions to obtain consistent microscopic information on the materials, such as Rouse time and entanglement molar mass, over the whole range of investigated molar masses, therefore overcoming the discrepancy usually found, mostly in the mass region of partial entanglement. Finally, descriptions of the polymer entanglement features, in agreement with the experimental and microscopic model findings, are provided in the framework of the packing-length phenomenological model and by means of analytical calculations of the polymer viscosity according to the Milner-McLeish-Likhtman model. Springer-Verlag Berlin Heidelberg, 2014 Reptation and tube theories nationallicence Rheology of polymers nationallicence Polymer melts nationallicence Properties of macromolecules nationallicence Linear viscoelasticity nationallicence Poly(ethyl acrylate) nationallicence Zulli Fabio Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut Giordano Marco Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut Andreozzi Laura Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut Rheologica Acta Springer Berlin Heidelberg 54/3(2015-03-01), 185-205 0035-4511 54:3<185 2015 54 397 https://doi.org/10.1007/s00397-014-0827-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-014-0827-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zulli Fabio Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut NATIONALLICENCE 700 1- Giordano Marco Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut NATIONALLICENCE 700 1- Andreozzi Laura Department of Physics "E. Fermi”, University of Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/3(2015-03-01), 185-205 0035-4511 54:3<185 2015 54 397