000057813 001__ 57813
000057813 005__ 20191105115758.0
000057813 0247_ $$2doi$$a10.3390/ma7021384
000057813 0248_ $$2sideral$$a85320
000057813 037__ $$aART-2014-85320
000057813 041__ $$aeng
000057813 100__ $$aKielmann, U.
000057813 245__ $$aStructural characterization of polymer-clay nanocomposites prepared by co-precipitation using EPR techniques
000057813 260__ $$c2014
000057813 5060_ $$aAccess copy available to the general public$$fUnrestricted
000057813 5203_ $$aPolymer-clay nanocomposites (PCNCs) containing either a rubber or an acrylate polymer were prepared by drying or co-precipitating polymer latex and nanolayered clay (synthetic and natural) suspensions. The interface between the polymer and the clay nanoparticles was studied by electron paramagnetic resonance (EPR) techniques by selectively addressing spin probes either to the surfactant layer (labeled stearic acid) or the clay surface (labeled catamine). Continuous-wave (CW) EPR studies of the surfactant dynamics allow to define a transition temperature T* which was tentatively assigned to the order-disorder transition of the surfactant layer. CW EPR studies of PCNC showed that completely exfoliated nanoparticles coexist with agglomerates. HYSCORE spectroscopy in PCNCs showed couplings within the probe -assigned with DFT computations- and couplings with nuclei of the environment, 1H and 23Na for the surfactant layer probe, and 29Si, 7Li, 19F and 23Na for the clay surface probe. Analysis of these couplings indicates that the integrity of the surfactant layer is conserved and that there are sizeable ionic regions containing sodium ions directly beyond the surfactant layer. Simulations of the very weak couplings demonstrated that the HYSCORE spectra are sensitive to the composition of the clay and whether or not clay platelets stack.
000057813 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000057813 590__ $$a2.651$$b2014
000057813 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b55 / 260 = 0.212$$c2014$$dQ1$$eT1
000057813 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000057813 700__ $$aJeschke, G.
000057813 700__ $$0(orcid)0000-0002-1827-1250$$aGarcía-Rubio, I.
000057813 773__ $$g7, 2 (2014), 1384-1408$$pMATERIALS$$tMATERIALS$$x1996-1944
000057813 8564_ $$s918661$$uhttps://zaguan.unizar.es/record/57813/files/texto_completo.pdf$$yVersión publicada
000057813 8564_ $$s90999$$uhttps://zaguan.unizar.es/record/57813/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000057813 909CO $$ooai:zaguan.unizar.es:57813$$particulos$$pdriver
000057813 951__ $$a2019-11-05-11:49:42
000057813 980__ $$aARTICLE