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Related Concept Videos

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

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

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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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Step-Growth Polymerization: Overview01:03

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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.
Many natural and synthetic polymers are produced by...
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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: Overview01:13

Olefin Metathesis Polymerization: Overview

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Amino Acid Platform for Poly(amino ester)s: Controlled Ring-Opening Polymerization, Complete Recyclability, and

Shi Ou1, Yu Dai1, Zhaolin Ding1

  • 1College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, P. R. China.

Angewandte Chemie (International Ed. in English)
|January 12, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a versatile platform for synthesizing diverse poly(amino esters) (PAEs) from amino acids via azalactone monomers. This method enables tunable polymer properties and efficient depolymerization, offering insights into polymer design.

Keywords:
AzalactonePoly(amino ester)Polymerizability/depolymerizabilityRing‐opening polymerizationStructure‐activity relationship

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Poly(amino esters) (PAEs) offer biodegradability and tunable functionality but lack versatile synthesis platforms.
  • Developing efficient methods for creating diverse PAE libraries is crucial for expanding their applications.

Purpose of the Study:

  • To establish a readily available and versatile platform for synthesizing diverse PAEs from amino acids.
  • To investigate the structure-activity relationships governing the ring-opening polymerization (ROP) and depolymerization of azalactone monomers.

Main Methods:

  • Synthesized azalactone monomers from renewable amino acids and epoxides in a two-step process.
  • Utilized organocatalytic controlled ROP to polymerize azalactone monomers.
  • Conducted depolymerization studies to assess monomer recovery and kinetics.
  • Investigated the influence of monomer structure (N-substituents, core substituents, stereoconfiguration, ring size) on polymerization and depolymerization.

Main Results:

  • Successfully synthesized a range of azalactone monomers with tailored properties.
  • Achieved controlled ROP of azalactone monomers, yielding diverse PAEs.
  • Demonstrated quantitative depolymerization of PAEs into their original monomers with first-order kinetics.
  • Established an inverse correlation between depolymerization and polymerization rate constants.
  • Showcased the ability to regulate polymerizability and depolymerizability by tuning azalactone structure and ceiling temperature (-20 to 37 °C).

Conclusions:

  • The developed platform provides a versatile route to diverse PAEs from amino acids.
  • Monomer structure significantly impacts ROP reactivity, polymerizability, and depolymerizability.
  • The tunable ceiling temperature offers control over polymerization and depolymerization, enabling recyclable polymer systems.