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Characteristics and Nomenclature of Copolymers01:24

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Multiblock copolymers exhibiting spatio-temporal structure with autonomous viscosity oscillation.

Michika Onoda1, Takeshi Ueki1, Mitsuhiro Shibayama2

  • 1Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

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This study introduces a novel ABA triblock copolymer that exhibits autonomous self-oscillation. This dynamic material forms and breaks aggregates, creating macroscopic viscoelastic behavior for advanced soft materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Soft Matter Physics

Background:

  • Designing dynamic soft materials with controllable structures is a key challenge in materials science.
  • Autonomous systems that respond to chemical stimuli offer pathways to create responsive materials.

Purpose of the Study:

  • To develop an ABA triblock copolymer capable of autonomous formation and break-up of aggregates.
  • To achieve macroscopic viscoelastic self-oscillation in polymer solutions through microscopic dynamic processes.
  • To integrate a chemical oscillatory reaction as a chemomechanical transducer for polymer aggregation control.

Main Methods:

  • Synthesis of ABA triblock copolymer using RAFT copolymerization, incorporating a hydrophilic B segment and self-oscillating A segments.
  • Introduction of a metal catalyst for the Belousov-Zhabotinsky (BZ) reaction within the A segments.
  • Time-resolved Dynamic Light Scattering (DLS) measurements to analyze structural changes.

Main Results:

  • Demonstrated autonomous formation and break-up of microscopic aggregates in the ABA triblock copolymer solution under constant conditions.
  • Observed macroscopic viscoelastic self-oscillation driven by the copolymer's dynamic aggregation behavior.
  • Confirmed transitional network structure of micelle aggregations (reduced state) and unimer structure (oxidized state) via DLS.

Conclusions:

  • The designed ABA triblock copolymer successfully exhibits autonomous viscoelastic self-oscillation.
  • The integration of the Belousov-Zhabotinsky reaction as a chemomechanical transducer enables redox-dependent structural changes.
  • This work paves the way for creating dynamic biomimetic soft materials with controllable spatio-temporal structures.