English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/21899
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Relaxation response of polymers containing highly flexible side groups monitored by broadband dielectric spectroscopy

AuthorsÁlvarez, Cristina; Lorenzo, Vicente; Riande, Evaristo
Issue Date16-May-2005
PublisherAmerican Institute of Physics
CitationJournal of Chemical Physics 122(19): 194905 (2005)
AbstractThe relaxation behavior of poly(5-acryloxymethyl-5-methyl-1,3-dioxacyclohexane), a polymer containing highly flexible side groups, is studied by broadband dielectric spectroscopy in the frequency and temperature ranges 10–1–109 Hz and 123–473 K, respectively. Above the glass transition temperature Tg the dielectric loss in the frequency domain exhibits a prominent absorption, followed in increasing order of frequencies by two secondary absorptions called and . At temperatures slightly higher than Tg, the relaxation is well separated from the , but as temperature increases overlapping between both relaxations augments forming an absorption in the vicinity of 420 K. This latter absorption displays a shoulder on its high-frequency side corresponding to the relaxation. The strength of the relaxation decreases with increasing temperature, eventually vanishing at the temperature at which the absorption is formed. The time retardation spectra of the isotherms are calculated and further used to facilitate the deconvolution of the overlapping relaxations. The fact that the temperature dependence of the relaxation also describes that of the absorption suggests that both relaxations have the same nature. It seems that as temperature increases, the relaxation feeds on the absorption until its complete disappearance. The relaxation, in turn, seems to increase at the expense of the process at high temperature.
Description9 pages, 10 figures.
Publisher version (URL)http://dx.doi.org/10.1063/1.1900064
Appears in Collections:(ICTP) Artículos
Files in This Item:
File Description SizeFormat 
GetPDFServlet.pdf163,52 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.