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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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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Design principles for metamorphic block copolymer assemblies.

Alessandro Ianiro1, Steven P Armes2, Remco Tuinier1

  • 1Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands. r.tuinier@tue.nl and Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands.

Soft Matter
|February 15, 2020
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Summary
This summary is machine-generated.

Block copolymer assemblies exhibit temperature-dependent shape changes (metamorphism). Researchers identified an optimal block length ratio for controlling these transitions, enabling design of new thermoresponsive materials.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Block copolymer assemblies can undergo temperature-induced morphology transitions, known as metamorphism.
  • Understanding the relationship between copolymer composition and metamorphic behavior is crucial for applications but currently limited.

Purpose of the Study:

  • To investigate the relationship between block copolymer composition and thermally-induced metamorphic behavior.
  • To develop design principles for thermoresponsive diblock copolymers using self-consistent field theory.

Main Methods:

  • Application of Scheutjens-Fleer Self-Consistent Field (SF-SCF) theory.
  • Analysis of block length ratios and solvency effects on morphology.
  • Identification of optimal parameters for controlled transitions.

Main Results:

  • Metamorphism arises from changes in lyophobic block stretching due to solvency variations.
  • An optimal lyophobic/lyophilic block length ratio (fB) of 3.5–5.5 was identified for morphology switching.
  • Controlled transitions between spheres, cylinders, and vesicles are achievable within this fB window.

Conclusions:

  • Fundamental design principles for thermoresponsive diblock copolymers exhibiting metamorphism were established.
  • The study provides a framework for predicting and controlling copolymer morphologies by tuning composition and solvency.
  • Empirical relationships were derived to bridge theoretical predictions with experimental outcomes.