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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Interplay of alpha/beta-Relaxation Dynamics and the Shape of Ionomer Building Blocks

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Matos, Bruno R. [1] ; Politano, Rodolfo [1] ; Rey, Jose Fernando Q. [2, 3] ; Hermida-Merino, Daniel [2] ; Schade, Ulrich [4, 5] ; Puskar, Ljiljana [4, 5] ; Fonseca, Fabio C. [1]
Total Authors: 7
[1] CNEN SP, IPEN, BR-05508000 Sao Paulo - Brazil
[2] DUBBLE ESRF, Netherlands Org Sci Res NWO, F-38000 Grenoble - France
[3] Univ Fed ABC, UFABC, BR-09219170 Santo Andre - Brazil
[4] Helmholtz Zentrum Mat, Methoden Mat Entwicklung, D-12489 Berlin - Germany
[5] EnergieGmbH, D-12489 Berlin - Germany
Total Affiliations: 5
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 8, SEP 7 2018.
Web of Science Citations: 0

The relation between the alpha/beta relaxations and the shape of the building blocks of ionomer materials is a key factor for programming an important temperature-dependent property: the memory of shape. However, the morphology of ionomers is indirectly obtained via modeling of small angle X-ray scattering (SAXS) data owing to the hardly accessible image characterization of the nanometric building blocks-micelle-like cylindrical polymeric aggregates (radius similar to 2-6 nm and length >100 nm). Herein, broadband dielectric spectroscopy (BDS) measurements, free from electrode polarization effects, allowed identifying the time and temperature dependence of the polarization of different length scales of the ionomer matrix, and more importantly, by directly providing the aspect ratio of the radius and length of the polymeric aggregates for each desired temperature. This finding is essential for controlling the shape of ionomer based functional products under several stimuli conditions, thereby advancing remarkable applications, such as four dimensional (4D) printing. (AU)

FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support type: Research Grants - Research Centers in Engineering Program
FAPESP's process: 16/14785-8 - 1st International Conference on advanced energy materials
Grantee:Bruno Ribeiro de Matos
Support type: Research Grants - Meeting - Abroad
FAPESP's process: 14/09087-4 - Studies on the use of bioethanol in proton exchange membrane and solid oxide fuel cells
Grantee:Marcelo Linardi
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/50151-5 - Development of composite electrolytes containing inorganic particles of high proton conductivity for direct ethanol fuel cells
Grantee:Bruno Ribeiro de Matos
Support type: Scholarships in Brazil - Post-Doctorate