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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Anionic Chain-Growth Polymerization: Overview01:20

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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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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Self-oscillating AB diblock copolymer developed by post modification strategy.

Takeshi Ueki1, Michika Onoda1, Ryota Tamate1

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

Chaos (Woodbury, N.Y.)
|June 29, 2015
PubMed
Summary
This summary is machine-generated.

We developed self-oscillating polymer block copolymers using ruthenium tris(2,2-bipyridine) for controlled assembly and disassembly. Post-modification synthesis yields enhanced bistable temperature regions for stable self-oscillation.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Self-oscillating polymers offer dynamic control over material properties.
  • Ruthenium tris(2,2'-bipyridine) (Ru(bpy)3) acts as a catalyst for the Belousov-Zhabotinsky reaction, enabling oscillation.
  • AB diblock copolymers combine hydrophilic and self-oscillating segments for tunable self-assembly.

Purpose of the Study:

  • To synthesize and characterize AB diblock copolymers with self-oscillating capabilities.
  • To investigate the effect of Ru(bpy)3 incorporation methods on copolymer behavior.
  • To explore the self-assembly, disassembly, and macroscopic property oscillations of these novel polymers.

Main Methods:

  • Synthesis of AB diblock copolymers via direct polymerization (DP) and post-modification (PM).
  • Incorporation of Ru(bpy)3 into N-isopropylacrylamide (NIPAAm)-based polymer segments.
  • Characterization using dynamic light scattering (DLS) and viscosity measurements.

Main Results:

  • Increasing Ru(bpy)3 content monotonically expands the bistable temperature region (ΔTm).
  • Post-modification (PM) synthesis resulted in a larger ΔTm compared to direct polymerization (DP).
  • Stable self-oscillation was achieved with a ΔTm of approximately 25°C using the PM method.
  • Periodic structural transitions and macroscopic viscosity oscillations were observed.

Conclusions:

  • The PM method enables the preparation of well-defined diblock copolymers with significant ΔTm for stable self-oscillation.
  • These self-oscillating polymers exhibit tunable self-assembly and disassembly behavior.
  • The study demonstrates potential for creating materials with dynamic, responsive properties through controlled polymer architecture.