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Related Concept Videos

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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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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

Anionic Chain-Growth Polymerization: Overview

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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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Phase manipulation of topologically engineered AB-type multi-block copolymers.

Sai Li1, Wei Tao1, Ke Gao1

  • 1Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology People's Republic of China lj200321039@163.com.

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|May 11, 2022
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This study uses molecular dynamics simulations to explore multi-block copolymers (MBCPs). Findings reveal how composition and nanoparticles influence ordered phases and transitions, guiding the design of advanced materials.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Polymer Science
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding the ordered phases of multi-block copolymers (MBCPs) at a molecular level is crucial for developing advanced materials.
  • Recent scientific interest has focused on the fundamental properties and phase behaviors of various MBCP architectures.

Purpose of the Study:

  • To investigate the phase behavior and order-to-order transitions (OOT) in different multi-block copolymer systems using molecular dynamics simulations.
  • To establish phase diagrams for linear tetrablock copolymers and explore the effects of composition, interaction strength, temperature, and shearing.
  • To analyze the influence of branching density and nanoparticle inclusion on copolymer phase transitions and morphology.

Main Methods:

  • Molecular dynamics simulations were employed to model and analyze four distinct multi-block copolymer systems.
  • Phase diagrams were established for linear tetrablock copolymers (ABAB) based on composition ratios.
  • The effects of repulsive interaction strength, temperature, dynamic shearing, branch density, and nanoparticle filling were systematically studied.

Main Results:

  • A phase diagram for linear ABAB tetrablock copolymers was established, showing six typical phase states.
  • Order-to-order transitions (OOT) were observed with increasing interaction strength, temperature, and shearing, leading to sphere merging.
  • Branch density in branched copolymers induced phase transitions, and sphere configurations were described by tail, loop, and bridge conformations.
  • Nanoparticle-filled copolymers exhibited OOT from spheres to double gyroid or cylinders, influenced by block distribution around nanoparticles.

Conclusions:

  • The study provides fundamental insights into the phase behavior and OOT of multi-block copolymers.
  • The findings offer guidelines for designing and fabricating high-performance copolymers by controlling ordered phase formation.
  • Understanding chain conformations and nanoparticle interactions is key to tailoring copolymer morphologies for specific applications.