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[16:10] MST colloquium
- Description:
- Wednesday, May 3, 2017
Speaker: Dr. E. Glynos
Affiliation: FORTH/IESL
Title: Designing Materials at the Macromolecular Level: From Controlling the Polymer Behavior at
Surfaces and Interfaces to High Performance Solid Polymer Electrolytes for Energy Storage
Location: 3rd Floor Seminar Room (Physics Building)
Time: 16:15 (sharp)
Language: English
Abstract:
The macroscopic properties of a polymer material are intimately related and are encrypted to its macromolecular structure. By adjusting the chemical structures of the constituent monomers, the molecular weight, and the linear or non-linear/branched architecture of the polymers, it is possible to formulate materials with an amazing variety of physical properties. To this end, advances in polymer chemistry have led to the synthesis of a wide range of well-defined non-linear polymers with controlled architectures (stars-shaped, H-shaped, pom-pom, ring, comb), compositions, and degree of polymerization, have provided material scientists the ability to design materials with desired/on-demand properties that meet the requirements of specific applications.
In the first part, I will provide evidence that several macroscopic properties of polymeric material, where polymer-interface interactions play a significant role, may be readily controlled simply by changing the macromolecular architecture and without changing the monomer or the interface chemistry. In particular, I will show that the equilibrium contact angles of macroscopic droplets of star-shaped polystyrene (SPS) molecules on oxidized silicon substrates, may be as much as one order of magnitude smaller than that of their linear analogues (linear polystyrene, LPS) on the same substrates. I will show how the aforementioned enhanced interfacial properties of star-shaped polymer are manifested on the vitrification behavior of supported polymer films and on the mechanical properties of polymer nanocomposite materials.
In the second part, I will introduce the use of polymer nanostructured nanoparticles of asymmetric mikto-arm copolymers, in which stiff insulating arms complement ion-conducting arms, as additives to liquid electrolytes for the synthesis of solid polymer electrolytes that exhibit an unprecedented combination of high modulus (G' ~ 0.1 GPa) and ionic-conductivity at room temperature (σ ~ 10-4 S/cm), necessary for practical applications. I will demonstrate that the final/desired morphology and phase dimension of the nanostructured solid-polymer electrolytes may be precisely controlled as the final morphology is encrypted within the macromolecular characteristics and the chemical composition of the "nanoparticles". Our strategy offers tremendous potential for the design of all-polymer nanostructured materials with optimized mechanical properties and ionic conductivity over a wide temperature window for advanced lithium battery technology.
For forthcoming colloquia, please visit:
http://www.materials.uoc.gr/en/colloquia
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May 2017
