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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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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 mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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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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Reverse Block Sequence in Self-Immolative Poly(benzyl ether)-Based Amphiphiles for Tailoring End Groups and

Ji Woo Kim1, Tae-Il Kang2, Eunpyo Choi3

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|April 30, 2025
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Summary
This summary is machine-generated.

This study introduces self-immolative poly(benzyl ether) (PBE) amphiphiles for controlled polymer structure and degradation. These functional surfactants enable tunable assembly, degradation, and drug delivery applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Development of advanced polymeric materials with controlled degradation is crucial for applications like drug delivery and nanotechnology.
  • Self-immolative polymers offer unique degradation pathways triggered by external stimuli.
  • Designing amphiphilic polymers with tunable self-assembly and degradation properties remains a challenge.

Purpose of the Study:

  • To report a modular design of self-immolative poly(benzyl ether) (PBE) amphiphiles.
  • To achieve precise control over polymer chain structure, end-group placement, and degradation behavior.
  • To demonstrate the potential for controlled cargo release using these novel amphiphiles.

Main Methods:

  • Synthesis of modular self-immolative poly(benzyl ether) (PBE) amphiphiles with varying block sequences and end groups.
  • Investigation of micelle formation and morphology influenced by structural variations and carboxylate content.
  • Evaluation of micelle degradation in aqueous environments and their transformation with conventional surfactants.
  • Demonstration of small-molecule cargo loading and on-demand release from mixed micelles.

Main Results:

  • A modular design for self-immolative PBE amphiphiles enabling precise control over structure and degradation was achieved.
  • Tuning of block sequences and end groups allowed for efficient head-to-tail depolymerization upon external stimuli.
  • Micelle formation with surface-displayed end groups and tunable morphology was observed.
  • Degradable micelles were formed, capable of transforming into spherical structures with surfactants and facilitating controlled cargo release.

Conclusions:

  • The developed PBE amphiphiles offer a versatile platform for creating functional, stimulus-responsive surfactants.
  • This design enables tunable self-assembly, degradation, and controlled release capabilities.
  • The modular approach provides a powerful tool for designing advanced polymeric materials for various applications.