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Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks

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Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks

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Título Influence of hydroxypropyl cellulose on molecular relaxations of epoxy-amine networks
Autor Miranda, Maria Inez Graf de
Samios, Dimitrios
Freitas, Liane Lucy de Lucca
Bica, Clara Ismeria Damiani
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.
Contido em Polímeros (São Carlos): ciência e tecnologia. São Carlos, SP. Vol. 23, n. 1 (jan./fev. 2013), p. 1-6
Assunto Copolímeros
Energia de ativação
Hidroxipropilcelulose
Resina epoxi
[en] Activation energy
[en] Epoxy
[en] Hydroxypropylcellulose
[en] Relaxations
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/75729
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