Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix
AbstractThe 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
Scifeed alert for new publicationsNever miss any articles matching your research from any publisher
- Get alerts for new papers matching your research
- Find out the new papers from selected authors
- Updated daily for 49'000+ journals and 6000+ publishers
- Define your Scifeed now
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.
Román F, Colomer P, Calventus Y, Hutchinson JM. Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix. Materials. 2016; 9(3):192.Chicago/Turabian Style
Román, Frida; Colomer, Pere; Calventus, Yolanda; Hutchinson, John M. 2016. "Molecular Mobility in Hyperbranched Polymers and Their Interaction with an Epoxy Matrix." Materials 9, no. 3: 192.
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.