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

Autor(es)

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]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 8, SEP 7 2018.
• Citações Web of Science: 0

Resumo

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)

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