Next Article in Journal
Preparation and Characterization of All-Biomass Soy Protein Isolate-Based Films Enhanced by Epoxy Castor Oil Acid Sodium and Hydroxypropyl Cellulose
Previous Article in Journal
Nanotextured Shrink Wrap Superhydrophobic Surfaces by Argon Plasma Etching
Open AccessArticle

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
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Jun-ichi Anzai
Materials 2016, 9(3), 192; https://doi.org/10.3390/ma9030192
Received: 21 December 2015 / Accepted: 10 March 2016 / Published: 15 March 2016
(This article belongs to the Section Structure Analysis and Characterization)
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)
Show Figures

Figure 1

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop