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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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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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Branched Acid-Degradable, Biocompatible Polyether Copolymers via Anionic Ring-Opening Polymerization Using an Epoxide

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Researchers developed new acid-degradable branched polyethers using a novel monomer, 1-(glycidyloxy)ethyl ethylene glycol ether (GEGE). These polymers, synthesized via anionic ring-opening polymerization, offer tunable degradation for advanced material applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Developing degradable polymers is crucial for sustainable materials.
  • Polyethers offer versatile properties but often lack inherent degradability.

Purpose of the Study:

  • To synthesize novel acid-degradable branched polyethers.
  • To incorporate acid-cleavable acetal moieties into polyether backbones.
  • To create multiarm star copolymers with degradable cores.

Main Methods:

  • Anionic ring-opening polymerization (AROP) of a novel degradable inimer, 1-(glycidyloxy)ethyl ethylene glycol ether (GEGE), with ethylene oxide (EO) or glycidol (G).
  • Synthesis of multiarm star copolymers using P(G-co-GEGE) as macroinitiators for EO polymerization.
  • Characterization using size exclusion chromatography (SEC) and 1H NMR spectroscopy.

Main Results:

  • Successfully synthesized branched polyethers P(EO-co-GEGE) and P(G-co-GEGE) with tunable acetal content.
  • Developed novel multiarm star copolymers P(G-co-GEGE-g-EO) with acid-labile cores and PEG side chains.
  • Materials exhibited narrow to moderate molecular weight distributions.
  • Demonstrated acid-triggered degradation of the synthesized polymers.

Conclusions:

  • The novel GEGE monomer enables the creation of acid-degradable branched polyethers and star copolymers.
  • These materials possess tunable degradation properties, opening avenues for advanced applications.
  • The synthetic strategy provides a versatile platform for designing functional degradable polymers.