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

Author(s)

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]

Affiliation

^[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

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 8, SEP 7 2018.
• Web of Science Citations: 0

Abstract

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 Opportunities: 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 Opportunities: 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 Opportunities: 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 Opportunities: Scholarships in Brazil - Post-Doctoral