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Dielectric relaxations of Acrylic-Polyurethane hybrid materials

AuthorsMartínez-Rugerio, G. ; Alegría, Ángel ; Colmenero de León, Juan
KeywordsDielectric relaxation
Polymer dynamics
Acrylic/Polyurethane hybrids
Issue Date2015
CitationPolymer 74: 21-29 (2015)
AbstractIn this work we present a dielectric relaxation study of Acrylic/Polyurethane polymers synthesized via miniemulsion photo-polymerization. Three different samples, both parts of the synthesized hybrid latex (SOL and GEL fractions) and a full acrylic sample as reference have been considered. Besides dielectric experiments using Broadband Dielectric Spectroscopy (BDS) technique, complementary Differential Scanning Calorimetry measurements have been performed. The thermodynamic characterization outcomes evidence very similar characteristics of the glass transition phenomena among the investigated samples without any signature of melting/crystallization. However BDS experiments show three well resolved dielectric relaxation processes above Tg, two of them evidence marked differences among the samples. A detail study allows us to provide a molecular origin for these three dielectric relaxation processes in connection with the sample characteristics. In particular, our results show that the characterization of these hybrid Acrylic/PU by BDS can provide access to some of the structural features that would ultimately influence the adhesives properties.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1016/j.polymer.2015.07.055
Identifiersdoi: 10.1016/j.polymer.2015.07.055
issn: 0032-3861
Appears in Collections:(CFM) Artículos
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