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)....
Main Authors: | , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2016-03-01
|
Series: | Materials |
Subjects: | |
Online Access: | http://www.mdpi.com/1996-1944/9/3/192 |
id |
doaj-8a5aa9e6c8e244c6a55917b10c2f55b9 |
---|---|
record_format |
Article |
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 |
work_keys_str_mv |
AT fridaroman molecularmobilityinhyperbranchedpolymersandtheirinteractionwithanepoxymatrix AT perecolomer molecularmobilityinhyperbranchedpolymersandtheirinteractionwithanepoxymatrix AT yolandacalventus molecularmobilityinhyperbranchedpolymersandtheirinteractionwithanepoxymatrix AT johnmhutchinson molecularmobilityinhyperbranchedpolymersandtheirinteractionwithanepoxymatrix |
_version_ |
1725637243293401088 |