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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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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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Polymers02:34

Polymers

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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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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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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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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Block Copolymer Vitrimers.

Jacob J Lessard1, Georg M Scheutz1, Seung Hyun Sung2

  • 1George and Josephine Butler Polymer Research Laboratory, Center of Macromolecular Science, Department of Chemistry , University of Florida , Gainesville , Florida 32611 , United States.

Journal of the American Chemical Society
|December 4, 2019
PubMed
Summary
This summary is machine-generated.

Block copolymers merged with vitrimers offer nanoscale control over flow and deformation. This new class of block vitrimers shows enhanced creep resistance due to controlled topology and microphase separation.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Rheology

Background:

  • Vitrimers are dynamic polymer networks with associative cross-links enabling flow and reprocessing.
  • Block copolymers offer precise control over polymer architecture and self-assembly into nanostructures.
  • Combining these materials could lead to advanced polymers with tunable viscoelastic properties.

Purpose of the Study:

  • To merge block copolymers with vitrimers for nanoscale control over associative cross-link dynamics and flow.
  • To investigate the structure-property relationships in these novel block vitrimers.
  • To explore the potential for topology control over viscoelastic behavior.

Main Methods:

  • Utilized controlled polymerization techniques to synthesize block copolymers with defined architectures and molecular weights.
  • Formulated vitrimers from these self-assembling block copolymers.
  • Characterized the viscoelastic properties and resistance to macroscopic deformation.

Main Results:

  • Vitrimers derived from block copolymers demonstrated superior resistance to macroscopic deformation compared to statistical copolymer analogs.
  • Controlled polymerization allowed precise tuning of polymer architecture and molecular weight, impacting structure-property effects.
  • Enhanced creep resistance was observed in block vitrimers, attributed to controlled chain topology and microphase separation.

Conclusions:

  • Block vitrimers represent a new class of materials with topology-controlled viscoelastic flow.
  • The microphase-separated structure in block vitrimers is key to their enhanced resistance to deformation.
  • These findings open avenues for designing advanced materials with tailored viscoelastic properties for specific applications.