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

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)....

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Main Authors: Frida Román, Pere Colomer, Yolanda Calventus, John M. Hutchinson
Format: Article
Language:English
Published: MDPI AG 2016-03-01
Series:Materials
Subjects:
Online Access:http://www.mdpi.com/1996-1944/9/3/192
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spelling doaj-8a5aa9e6c8e244c6a55917b10c2f55b92020-11-24T23:02:08ZengMDPI AGMaterials1996-19442016-03-019319210.3390/ma9030192ma9030192Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy MatrixFrida Román0Pere Colomer1Yolanda Calventus2John M. Hutchinson3Departament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Terrassa 08222, Barcelona, SpainDepartament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Terrassa 08222, Barcelona, SpainDepartament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Terrassa 08222, Barcelona, SpainDepartament de Màquines i Motors Tèrmics, ESEIAAT, Universitat Politècnica de Catalunya, Terrassa 08222, Barcelona, SpainThe 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.http://www.mdpi.com/1996-1944/9/3/192dielectric relaxation spectroscopy (DRS)differential scanning calorimetry (DSC)dynamic mechanical analysis (DMA)hyperbranched polymerepoxypoly(ethyleneimine)
collection DOAJ
language English
format Article
sources DOAJ
author Frida Román
Pere Colomer
Yolanda Calventus
John M. Hutchinson
spellingShingle Frida Román
Pere Colomer
Yolanda Calventus
John M. Hutchinson
Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
Materials
dielectric relaxation spectroscopy (DRS)
differential scanning calorimetry (DSC)
dynamic mechanical analysis (DMA)
hyperbranched polymer
epoxy
poly(ethyleneimine)
author_facet Frida Román
Pere Colomer
Yolanda Calventus
John M. Hutchinson
author_sort Frida Román
title Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
title_short Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
title_full Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
title_fullStr Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
title_full_unstemmed Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
title_sort molecular mobility in hyperbranched polymers and their interaction with an epoxy matrix
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2016-03-01
description 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.
topic dielectric relaxation spectroscopy (DRS)
differential scanning calorimetry (DSC)
dynamic mechanical analysis (DMA)
hyperbranched polymer
epoxy
poly(ethyleneimine)
url http://www.mdpi.com/1996-1944/9/3/192
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