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Polymers02:34

Polymers

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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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Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
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Cellulose and Pectic Polysaccharides01:15

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
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Conjugation is a form of horizontal gene transfer that primarily occurs in bacteria and some archaea, promoting genetic diversity and adaptation. Bacteria can acquire resistance genes through conjugative plasmids, allowing them to survive antibiotic treatments that would otherwise be lethal. This process involves direct contact between cells through specialized structures such as the sex pilus and is mediated by conjugative plasmids, including the F (fertility) factor.Conjugation requires...
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Updated: Jan 22, 2026

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Functionalized Cellulose Nanocrystal-Mediated Conjugated Polymer Aggregation.

Bailey Risteen, Michael McBride, Miguel Gonzalez

    ACS Applied Materials & Interfaces
    |July 3, 2019
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    Summary
    This summary is machine-generated.

    Bioderived cellulose nanocrystals (CNCs) guide the self-assembly of semiconducting polymers for improved organic electronics. Polymer-grafted CNCs enhance poly(3-hexylthiophene) (P3HT) aggregation, boosting device performance and sustainability.

    Keywords:
    OFET devicesSI-ATRPcellulose nanocrystalsconjugated polymerscrystallization

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    Area of Science:

    • Organic electronics
    • Materials science
    • Polymer chemistry

    Background:

    • Self-assembly of π-conjugated polymers into semicrystalline aggregates is crucial for organic electronics.
    • Current methods often require energy-intensive processing.

    Purpose of the Study:

    • To investigate cellulose nanocrystals (CNCs) as structure-directing agents for poly(3-hexylthiophene) (P3HT) self-assembly.
    • To enhance the performance and sustainability of organic electronic materials.

    Main Methods:

    • Grafting CNCs with different polymers (polystyrene, P3HT, poly(N-isopropylacrylamide)).
    • Blending polymer-grafted CNCs with P3HT in solution.
    • Characterizing P3HT aggregation using UV-vis spectroscopy and fitting to the Avrami crystallization model.
    • Measuring surface energies via contact angles.
    • Fabricating and testing organic field-effect transistors (OFETs).

    Main Results:

    • Polymer-grafted CNCs increased P3HT semicrystalline aggregate formation.
    • Aggregation degree correlated with the surface free energy of the grafted polymer.
    • Unfavorable polymer-polymer interactions and phase separation enhanced P3HT aggregation.
    • OFETs with P3HT/CNC films showed up to a 6-fold increase in charge-carrier mobility.

    Conclusions:

    • Bioderived CNCs effectively direct conjugated polymer self-assembly.
    • This approach improves the electronic performance of organic semiconductors.
    • Utilizing CNCs offers a cost-effective and sustainable method for advancing organic electronics.