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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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Molecular Weight of Step-Growth Polymers01:08

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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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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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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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Microphase separation in random multiblock copolymers.

E N Govorun1, A V Chertovich1

  • 1Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory 1-2, Moscow 119991, Russia.

The Journal of Chemical Physics
|January 23, 2017
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Summary

Short blocks in random multiblock copolymers influence microphase separation by penetrating alien domains and altering interfacial tension. Increased block size dispersity leads to larger domain sizes, impacting material properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Statistical Mechanics

Background:

  • Random multiblock copolymers exhibit complex microphase separation behavior.
  • Strong segregation of long blocks is typical, but short blocks can interact with adjacent domains.

Purpose of the Study:

  • To investigate the role of short blocks in the microphase separation of bidisperse random multiblock copolymers.
  • To model multiblock copolymers with high block size polydispersity using a bidisperse approach.

Main Methods:

  • Mean-field theory is employed to analyze the copolymer system.
  • The study considers a bidisperse copolymer model with long and short blocks.

Main Results:

  • Short blocks penetrate "alien" domains, forming joint long blocks and modifying interfacial tension.
  • The penetration is governed by the Flory-Huggins interaction parameter (χ) and short block length (Nsh).
  • Domain size increases with block size dispersity, especially at lower χNsh values.

Conclusions:

  • Short blocks significantly influence microphase separation and domain morphology in random multiblock copolymers.
  • Block size dispersity is a critical factor controlling domain size and copolymer behavior.