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SUMMARY:Dynamic Polymer Thin Film Rheology - Ellie Porath (Université PSL
 )
DTSTART:20250911T140000Z
DTEND:20250911T140500Z
UID:TALK233332@talks.cam.ac.uk
DESCRIPTION:Dynamic covalent polymer networks are viscoelastic\, self-heal
 ing materials that have applications in soft robotics\, adhesives\, 3D pri
 nting\, and reusable plastics\, including coatings. Using poly(dimethyl si
 loxane)-based dynamic polymer networks\, we designed an ultra-thin polymer
  coating. The PDMS thin film is superhydrophobic\, transparent\, and adapt
 able to rough or curved surfaces\, making it ideal for multiple applicatio
 ns from the energy sector for solar panels to the commercial sector for ca
 rs or as screen protectors. This gel network can be applied to various sur
 faces (glass\, metals\, silicon) at heights of 10 nm &ndash\; 1 micron and
  still achieve self-healing from pinholes and cuts\, prevent delamination 
 of the coating\, and promote dropwise condensation for multiple weeks. To 
 unite the dynamic polymer mechanical behavior on the macroscale to the mic
 roscale\, the relaxation time of the dynamic polymer measured via rheology
  is compared to the self-healing behavior of a cut in the dynamic thin fil
 m using ellipsometry and Atomic Force Microscopy (AFM) as thin film polyme
 r rheology. For non-dynamic glassy thin polymer films\, the width of the c
 ut with time follows a power law. This and other models dictating relation
 ships between cut width and self-healing success are investigated for our 
 dynamic polymer network. Factors such as film thickness\, cut length and s
 hape\, and crosslinking density of the polymer are also used to tune the r
 elaxation response of the material.  &nbsp\;
LOCATION:External
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