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Influence of solvent on the network structure formed by free radical polymerization of tri-ethylene glycol dimethacrylate: A dielectric study
dc.contributor.author | Sabater Serra, Roser | |
dc.contributor.author | Viciosa Plaza, M. T | |
dc.contributor.author | Dionísio, Madalena | |
dc.contributor.author | Andrio, Andreu | |
dc.contributor.author | Meseguer Dueñas, José María | |
dc.contributor.author | Gomez Ribelles, Jose Luis | |
dc.date.accessioned | 2012-10-22T11:17:37Z | |
dc.date.available | 2012-10-22T11:17:37Z | |
dc.date.issued | 2010 | |
dc.identifier | http://dx.doi.org/10.1016/j.jnoncrysol.2009.06.048 | |
dc.identifier.citation | Journal of Non-Crystalline Solids, 356, 17-nov, p. 616-620 | |
dc.identifier.issn | 223093 | |
dc.identifier.uri | http://hdl.handle.net/10234/49407 | |
dc.description.abstract | Molecular mobility of a series of tri-ethylene glycol dimethacrylate (TrEGDMA) samples polymerized with different amounts of ethyl acetate up to 40% (w/w) as diluent was investigated by dielectric relaxation spectroscopy. In the first measuring scan, the samples show three secondary relaxation processes: a γ process related to the twisting motions within the ethylene glycol moiety as found in the unreacted monomer, a β process assigned to hindered rotations of carboxylic groups residing in non-bonded ends of the monomers linked to the network only by one side of the molecule; and additionally, at higher temperatures, a third process was detected designated as β<sub>pol</sub>, ascribed to a π flip of the ester unit accompanied by a restricted main chain rearrangement. While the γ and the β<sub>pol</sub> processes remain in the second scan, the β relaxation goes to extinction due to post-polymerization that took place at the highest temperatures scanned in the previous run, leading to complete polymerization of the network. The strength of γ and β relaxation measured in the first scan increases with the amount of solvent present in the initial mixture, nevertheless, in any case, β relaxation completely disappears in the second scan. © 2009 Elsevier B.V. All rights reserved. | |
dc.language.iso | eng | |
dc.publisher | Elsevier | |
dc.rights.uri | http://rightsstatements.org/vocab/CNE/1.0/ | * |
dc.subject | Dielectric properties | |
dc.subject | Electric modulus | |
dc.subject | Relaxation | |
dc.title | Influence of solvent on the network structure formed by free radical polymerization of tri-ethylene glycol dimethacrylate: A dielectric study | |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | http://dx.doi.org/10.1016/j.jnoncrysol.2009.06.048 | |
dc.rights.accessRights | info:eu-repo/semantics/closedAccess | |
dc.type.version | info:eu-repo/semantics/publishedVersion |
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