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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 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.
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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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Updated: Mar 15, 2026

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Hierarchical Layer Engineering Using Supramolecular Double-Comb Diblock Copolymers.

Anton H Hofman1, Mehedi Reza2, Janne Ruokolainen2

  • 1Macromolecular Chemistry & New Polymeric Materials, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands.

Angewandte Chemie (International Ed. in English)
|September 17, 2016
PubMed
Summary
This summary is machine-generated.

Researchers discovered unique multilayered structures in supramolecular double-comb diblock copolymers. The number of internal layers precisely scales with molecular weight, enabling controlled design of complex materials.

Keywords:
block copolymersmorphologysupramolecular self-assembly

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Diblock copolymers self-assemble into various nanostructures.
  • Supramolecular chemistry offers routes to complex polymer architectures.

Purpose of the Study:

  • To investigate the formation of unusual multilayered lamellae-in-lamellae structures.
  • To explore the relationship between molecular weight and structural complexity.

Main Methods:

  • Synthesis of symmetric supramolecular double-comb diblock copolymers.
  • Characterization of self-assembled nanostructures using microscopy and scattering techniques.
  • Systematic variation of molecular weight (M) while maintaining fixed surfactant concentration.

Main Results:

  • Formation of unprecedented multilayered parallel lamellae-in-lamellae structures observed.
  • The number of internal layers increased with molecular weight, reaching up to 34 layers.
  • A precise scaling relationship (n ∝ M0.67) was established between the number of internal structures (n) and molecular weight (M).

Conclusions:

  • The study demonstrates precise control over the formation of complex multilayered nanostructures in block copolymers.
  • The established scaling law facilitates the rational design of materials with tailored internal layer numbers.
  • This work opens avenues for developing advanced functional materials based on controlled supramolecular assembly.