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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
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α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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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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Structurally Enhanced Colloidal Molecules via Carbene-Mediated Covalent C─H Insertion Crosslinking.

Liwei Dai1, Chongyang Yao1, Xiancheng Zhang1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, People's Republic of China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 23, 2026
PubMed
Summary

Researchers developed a universal strategy using covalent crosslinking to enhance the structural stability of colloidal molecules (CMs). This method improves resistance to harsh conditions while preserving CM properties, enabling new material applications.

Keywords:
colloidal moleculesphoto‐crosslinkingpolymer ligandsself‐assembly of nanoparticlesstructural stability

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Area of Science:

  • Materials Science
  • Colloid Chemistry

Background:

  • Achieving high structural stability in colloidal molecules (CMs) is essential for their use in advanced materials and devices.
  • Current methods for stabilizing CMs often face limitations in preserving their integrity and properties.

Purpose of the Study:

  • To develop a universal strategy for significantly enhancing the structural stability of CMs.
  • To maintain the structural integrity and physicochemical properties of CMs after stabilization.

Main Methods:

  • A novel strategy involving nonspecific covalent crosslinking of surface ligands on CMs was developed.
  • A specifically designed crosslinker, 3G, was utilized, featuring shielded C-H bonds and optimized spacing for efficient particle bridging.
  • The crosslinking process was performed under mild reaction conditions.

Main Results:

  • The resulting crosslinked CMs demonstrated exceptional stability against alkaline conditions (pH 12), high salt concentrations (150 mM), electric fields, and hydrogen-bonding disruptions.
  • The crosslinking strategy successfully preserved the structural integrity and physicochemical properties of the CMs.
  • The 3G crosslinker's design facilitated efficient bridging of adjacent particles.

Conclusions:

  • Nonspecific covalent crosslinking offers a universal and effective method for stabilizing CMs.
  • This approach broadens the applicability of CMs, including those with complex 3D architectures, for diverse applications.
  • The method overcomes limitations of conventional stabilization techniques requiring specialized ligands.