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Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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Aggregate classification is generally based on its size, petrographic characteristics, weight, and source. Size classification ranges from coarse to fine aggregates, defined by the size of the particles. Coarse aggregates are particles that do not pass through ASTM sieve No. 4, and aggregates that pass through the sieve are fine aggregates.
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Interface-Dependent Aggregation-Induced Delayed Fluorescence in Bottlebrush Polymer Nanofibers.

Christopher M Tonge1, Zachary M Hudson1

  • 1Department of Chemistry , The University of British Columbia , 2036 Main Mall , Vancouver , British Columbia V6T 1Z1 , Canada.

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|August 24, 2019
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Bottlebrush nanofibers offer a way to control interactions between optoelectronic polymers. This allows tuning of thermally activated delayed fluorescence (TADF) properties for advanced materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Optoelectronics

Background:

  • Bottlebrush copolymers enable the creation of multicompartment nanomaterials with inherent nanosegregation.
  • Controlling interfaces between distinct polymers is crucial for optoelectronic device performance.

Purpose of the Study:

  • To synthesize and characterize bottlebrush nanofibers using an acridine- and triazine-based donor/acceptor pair.
  • To investigate the influence of bottlebrush morphology on through-space charge transfer (TSCT) and thermally activated delayed fluorescence (TADF) properties.
  • To demonstrate the ability to control polymer interactions for optoelectronic applications.

Main Methods:

  • Synthesis of bottlebrush nanofibers with varying donor and acceptor domain morphologies (random, miktoarm, block).
  • Characterization of material properties including TSCT and TADF.
  • Fabrication of thin films and investigation of fiber aggregation effects.

Main Results:

  • Achieved control over donor and acceptor domain arrangement within bottlebrush nanofibers.
  • Demonstrated nanofibers exhibiting strong TSCT TADF, switchable TSCT TADF upon aggregation, or preserved individual component properties.
  • Showcased the ability to either promote or suppress interactions between dissimilar optoelectronic polymers.

Conclusions:

  • Bottlebrush strategy provides a versatile route to engineer interfaces in multicomponent polymer systems.
  • This method allows precise control over optoelectronic properties by manipulating polymer interactions.
  • Offers a convenient approach for maximizing or minimizing donor-acceptor interactions in semiconductor polymer blends.