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SUMMARY:IMX Seminar Series - Co-continuous Nanostructures in Charged Polym
 er Materials
DTSTART:20210322T131500
DTEND:20210322T141500
DTSTAMP:20260413T212240Z
UID:b1d36b706b7999285efe74305db21a326fb89c24690e8556f51cbd61
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Timothy Lodge\, University of Minnesota\, USA\nNanostruc
 tured materials with co-continuous structures\, in which each discrete dom
 ain is independently interconnected\, can simultaneously optimize “ortho
 gonal” properties such as ion transport and mechanical strength. Potenti
 al applications include porous membranes\, fuel cells\, and rechargeable m
 etal batteries. Block polymers have been exploited as templating agents to
  access such morphologies\, for example via ordered periodic phases such a
 s the double gyroid\, or by polymerization-induced microphase separation. 
 In such cases the conducting domains are typically ≤ 20 nm in size\, whi
 ch can compromise both mobility and strength. An alternate route involves 
 blending an A–B diblock copolymer with the constituent A and B homopolym
 ers\, leading to a disordered bicontinuous microemulsion (BmE) state. We h
 ave shown that charge-free ternary A–B/A/B polymer blends universally se
 lf-assemble into the thermodynamically stable BmE phase\, albeit with care
 fully designed molecular weights and compositions. The BmE displays global
 ly disordered but locally correlated domains\, with tunable characteristic
  length scales in the range of ca. 20–100 nm\, well beyond the domain si
 zes typically associated with pure diblocks. The interesting question that
  arises is whether this phase can also be accessed in blends containing ch
 arge\, where in general the intermolecular interactions are stronger and m
 ore long-ranged. We are exploring this issue in two cases: an A–B/A/B te
 rnary system with added salt\, and an A–B/A/B system in which one of the
  polymers is ionomeric.\n 
LOCATION:https://epfl.zoom.us/j/95940364570
STATUS:CONFIRMED
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