Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Gels, Polymer Networks and Elastomers II

CPP 29.4: Vortrag

Mittwoch, 20. März 2024, 15:45–16:00, H 0106

Structure-Property Relationships of Biobased High-Performance Vitrimers — •Paulina Szymoniak¹, De-Yi Wang², and Andreas Schönhals¹ — ¹Federal Institute for Materials Research and Testing (BAM) Unter den Eichen 87, 12205 Berlin, Germany — ²IMDEA Materials Institute, Eric Kandel 2, 28906 Getafe, Madrid, Spain

Epoxy vitrimers are a novel class of materials, showing great potential as sustainable replacement to classical epoxy thermosets within the frames of circular economy. Vitrimers are based on covalent adaptive networks (CANs), where dynamic bonds can break/reform and reshuffle upon a suitable stimulus, endowing polymers with unprecedented properties, such as shape-memory, self-healing, and recyclability. Here, the relationships between the microscopic structure and molecular mobility with thermomechanical performance of a novel vitrimer are studied. The material is based on glycerol triglycidyl ether (GTE) and vanillin-derivative hardener (VA), which represents an ideal biobased substitute for fossil-derived epoxy resins. The applied methodology comprises X-ray scattering, dielectric and mechanical spectroscopy, as well as calorimetry. Dielectric investigations of the materials revealed two dielectrically active processes, i.e., one related to segmental mobility, and a second broad process related to topology reshuffle. Further, GTE-VA is considered in the 'as-prepared' and 'healed' state, where the thermomechanical properties are studied as a function of recycling cycles, showing weak dependency on the healing procedure.

Keywords: vitrimers; biobased polymers; covalent adaptive networks