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Materials 2016, 9(3), 192; doi:10.3390/ma9030192

Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix

Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Terrassa 08222, Barcelona, Spain
These authors contributed equally to this work.
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Academic Editor: Jun-ichi Anzai
Received: 21 December 2015 / Accepted: 10 March 2016 / Published: 15 March 2016
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The molecular mobility related to the glass transition and secondary relaxations in a hyperbranched polyethyleneimine, HBPEI, and its relaxation behaviour when incorporated into an epoxy resin matrix are investigated by dielectric relaxation spectroscopy (DRS) and dynamic mechanical analysis (DMA). Three systems are analysed: HBPEI, epoxy and an epoxy/HBPEI mixture, denoted ELP. The DRS behaviour is monitored in the ELP system in three stages: prior to curing, during curing, and in the fully cured system. In the stage prior to curing, DRS measurements show three dipolar relaxations: γ, β and α, for all systems (HBPEI, epoxy and ELP). The α-relaxation for the ELP system deviates significantly from that for HBPEI, but superposes on that for the epoxy resin. The fully cured thermoset displays both β- and α-relaxations. In DMA measurements, both α- and β-relaxations are observed in all systems and in both the uncured and fully cured systems, similar to the behaviour identified by DRS. View Full-Text
Keywords: dielectric relaxation spectroscopy (DRS); differential scanning calorimetry (DSC); dynamic mechanical analysis (DMA); hyperbranched polymer; epoxy; poly(ethyleneimine) dielectric relaxation spectroscopy (DRS); differential scanning calorimetry (DSC); dynamic mechanical analysis (DMA); hyperbranched polymer; epoxy; poly(ethyleneimine)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Román, F.; Colomer, P.; Calventus, Y.; Hutchinson, J.M. Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix. Materials 2016, 9, 192.

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