Supplementary information files for article: 'Entanglement dynamics in ultra-high molecular weight polyethylene as revealed by dielectric spectroscopy' DrakopoulosStavros PsarrasGeorgios C. ForteGiuseppe Martín-FabianiIgnacio RoncaSara 2018 Supplementary information files for article: 'Entanglement dynamics in ultra-high molecular weight polyethylene as revealed by dielectric spectroscopy'.<div><br><u>Abstract: </u><div>With the help of Broadband <a href="https://www.sciencedirect.com/topics/chemistry/impedance-spectroscopy">Dielectric Spectroscopy</a>, it has been possible to study the <a href="https://www.sciencedirect.com/topics/chemistry/molecular-dynamics">molecular dynamics</a> of disentangled Ultra High Molecular Weight <a href="https://www.sciencedirect.com/topics/materials-science/polyethylene">Polyethylene</a> in a wide temperature and frequency range. Catalytic ashes of <a href="https://www.sciencedirect.com/topics/materials-science/aluminum-oxide">aluminum oxide</a> act as <a href="https://www.sciencedirect.com/topics/chemistry/dielectric-material">dielectric</a> probes, allowing the identification of five different processes: an αc-process due to movements in the <a href="https://www.sciencedirect.com/topics/materials-science/crystalline-material">crystalline</a> phase, two γ-processes attributed to amorphous chain portions close to the crystalline lamellae, and two β-processes that we have attributed to the disentangled and entangled amorphous phases. The entanglement formation has been followed by isothermal runs and a model that predicts the energy spent to form entanglements as a function of time and temperature is thereby proposed. This model allowed us to calculate the associated <a href="https://www.sciencedirect.com/topics/chemistry/activation-energy">activation energy</a> of the entanglement process.<p>Our work advances further the understanding of entanglement dynamics of ultra-high molecular weight <a href="https://www.sciencedirect.com/topics/materials-science/polymer">polymers</a>, and the proposed model could prove useful to describe other similar processes such as cross-linking.</p><p>In the supporting information provided for this article, the comparison between the loss <a href="https://www.sciencedirect.com/topics/chemistry/permittivity">permittivity</a> and <a href="https://www.sciencedirect.com/topics/chemistry/loss-modulus">loss modulus</a> as a function of frequency varying the temperature, the superposition lines of the Havriliak-Negami fits against the experimental data for all the measured temperatures and the tables for the fittings are present.<br></p></div></div>