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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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.
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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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.
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Radical Chain-Growth Polymerization: Mechanism01:09

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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...
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Core-Shell Hyperbranched Polymers via Catalytic Ring-Opening Metathesis Polymerization.

Indradip Mandal1, Ijaj Ahmed1, Bettina Tran1

  • 1Department of Chemistry, University of Fribourg, Chemin du Musée 9, Fribourg, 1700, Switzerland.

Angewandte Chemie (International Ed. in English)
|April 14, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed hyperbranched polymers (HBPs) using ring-opening metathesis polymerization (ROMP). These polymers exhibit controlled structures, globular shapes, and enable efficient encapsulation and release, showing promise for drug delivery and sustainable materials.

Keywords:
Catalytic polymerizationGrubbs catalystHyperbranched polymersRing‐opening metathesis polymerizationUnimolecular micelles

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Hyperbranched polymers (HBPs) offer unique properties due to their complex architectures.
  • Ring-opening metathesis polymerization (ROMP) is a versatile technique for polymer synthesis.
  • Controlled synthesis of HBPs with defined structures remains a challenge.

Purpose of the Study:

  • To develop a divergent ROMP approach for synthesizing well-defined HBPs.
  • To characterize the structural and solution properties of the synthesized HBPs.
  • To explore the application of functionalized HBPs as core-shell materials for encapsulation and release.

Main Methods:

  • Synthesis of an ABB'-type hyperbranching monomer for divergent ROMP.
  • Copolymerization of the hyperbranching monomer with linear comonomers.
  • Characterization using dynamic light scattering (DLS) and X-ray scattering.
  • Functionalization of HBPs to create core-shell structures for guest molecule encapsulation.

Main Results:

  • Controlled molar mass and dispersity of branched polymers were achieved.
  • Globular structures of HBPs in solution were confirmed by DLS and X-ray scattering.
  • Functionalized HBPs formed core-shell particles with efficient encapsulation of organic dyes.
  • Demonstrated degradation under mild acidic conditions, highlighting sustainability.

Conclusions:

  • The divergent ROMP approach provides a viable route to controlled HBP synthesis.
  • Synthesized HBPs possess globular architectures suitable for encapsulation applications.
  • Core-shell particles derived from HBPs show potential for controlled release applications, including drug delivery.
  • The degradable nature of these polymers supports sustainable polymer design principles.