Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks
dc.contributor.author | Miranda, Maria Inez Graf de | pt_BR |
dc.contributor.author | Samios, Dimitrios | pt_BR |
dc.contributor.author | Freitas, Liane Lucy de Lucca | pt_BR |
dc.contributor.author | Bica, Clara Ismeria Damiani | pt_BR |
dc.date.accessioned | 2013-07-09T01:52:08Z | pt_BR |
dc.date.issued | 2013 | pt_BR |
dc.identifier.issn | 0104-1428 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/75729 | pt_BR |
dc.description.abstract | A dynamic mechanical analysis (DMTA) study was conducted on epoxy-amine networks crosslinked in the presence of low contents of hydroxypropyl cellulose (HPC). The epoxy resin chosen was diglycidylether of bisphenol-A (DGEBA) and the crosslinker was 4,4’-diaminodiphenylmethane (DDM). In the glassy region, primary (α) and secondary (β,γ) relaxations originating from the epoxy and HPC components were well detected. Two primary relaxations of neat epoxy and epoxy/HPC systems, referred to as α epoxy and α epoxy, could be detected, showing a particular glassy behavior for the systems studied in comparison with systems cured in bulk. The main relaxation temperature Tα (at the peak of α epoxy relaxation) of the epoxy systems increased slightly with the addition of HPC. The activation energy for this transition (Tα) of the epoxy-amine networks was determined both from tan δ and the peak temperatures for the loss modulus measured at various frequencies. The activation energy of the α epoxy relaxation determined from the loss modulus was more reliable than that based on tan δ. The addition of HPC lowered the activation energy of this α epoxy relaxation. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Polímeros (São Carlos): ciência e tecnologia. São Carlos, SP. Vol. 23, n. 1 (jan./fev. 2013), p. 1-6 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Epoxy | en |
dc.subject | Hidroxipropilcelulose | pt_BR |
dc.subject | Energia de ativação | pt_BR |
dc.subject | Relaxations | en |
dc.subject | Hydroxypropylcellulose | en |
dc.subject | Copolímeros | pt_BR |
dc.subject | Activation energy | en |
dc.subject | Resina epóxi | pt_BR |
dc.title | Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 000878703 | pt_BR |
dc.type.origin | Nacional | pt_BR |
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