22/10/2021 03:00 PM


22/10/2021 04:30 PM



see webconference link below

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Bundesanstalt für Materialforschung und -prüfung, Department Materials Engineering

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Source: BAM

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Lecture on 22 October 2021

Prof. Nancy R. Sottos
UIUC, Illinois, USA

DateFriday, 22 October 2021, 3:00 pm
Type of EventLecture (Webex)
TopicControl of Reaction Fronts for Rapid Energy-Efficient Manufacturing of Multifunctional Polymers and Composites

Prof. Nancy R. Sottos

UIUC, Illinois, USA

SummaryThis lecture describes a new manufacturing platform technology that allows for near net-zero energy fabrication of structural polymers and composites. The approach is predicated on the exploitation of a self-propagating polymerization reaction occurring in a system undergoing reaction and diffusion of its components. The system uses the exothermic release of energy to provide a positive feedback to the reaction. In turn, this stimulates further exothermic energy release, and a self-propagating reaction front that rapidly moves through the material – a process called frontal polymerization. The frontal ring opening metathesis polymerization of endo-dicyclopentadiene using a thermally activated ruthenium catalyst exhibits the high energy density, high reactivity, and low viscosity required for the synthesis of high-performance thermosets. The resulting polydicyclopentadiene is a cross-linked thermoset polymer suitable for the fabrication of durable resin and fiber-reinforced composites. Composite parts are fabricated in less than 5 min by frontal ring opening metathesis polymerization of woven carbon fibers infused with monomer solution. The total energy to create a 30x30 cm panel is 50 J compared to approximately 500 MJ by conventional autoclave curing – a seven order of magnitude decrease in required energy. Tuning the resin chemistry allows access to a range of rheological profiles between low-viscosity liquid and free-standing elastomeric gel – all of which frontally polymerize upon thermal activation. The gel is amenable to 3D printing by extruding from a print head and frontally polymerizing immediately upon exiting the nozzle, thereby allowing for the simultaneous freeform printing and curing of thermoset polymers. Frontal polymerization enables the manufacture of complex architectures, in situ fabrication of vascular networks and the seamless addition of functional additives not possible with traditional processing approaches.
ContactRobert.Maass [at]