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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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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

Anionic Chain-Growth Polymerization: Overview

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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

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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Updated: Sep 13, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Directional Depolymerization of Poly(ε-caprolactone) with High Monomer Selectivity.

Rulin Yang1,2, Wei Wei1,2, Guangqiang Xu1,2,3

  • 1Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.

Angewandte Chemie (International Ed. in English)
|July 27, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces novel (BisSalen)Al catalysts for the selective chemical recycling to monomer (CRM) of poly(ε-caprolactone) (PCL). These catalysts achieve high yields of ε-caprolactone monomer, advancing sustainable polymer recycling.

Keywords:
Biodegradable polyesterChain‐end backbitingChemical recycling to monomerClose‐loopPoly(ε‐caprolactone)Selective depolymerization

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Area of Science:

  • Polymer Chemistry
  • Catalysis
  • Sustainable Materials

Background:

  • Chemical recycling to monomer (CRM) offers closed-loop polymer utilization but often yields byproducts alongside desired monomers.
  • Directional depolymerization to monomers is crucial for efficient polymer recycling without property loss.
  • Poly(ε-caprolactone) (PCL) depolymerization is a key target for sustainable plastic management.

Purpose of the Study:

  • To develop a catalyst system for highly selective chemical recycling of PCL to its monomer, ε-caprolactone (ε-CL).
  • To investigate the structure-activity relationship of catalysts in controlling depolymerization selectivity.
  • To provide theoretical insights into the mechanism of selective PCL depolymerization.

Main Methods:

  • Synthesis and application of innovative (BisSalen)Al catalysts with confined cavity structures.
  • Solution-phase depolymerization of PCL.
  • Analysis of depolymerization products using Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Computational investigation using Density Functional Theory (DFT) calculations.

Main Results:

  • The (BisSalen)Al catalysts achieved highly selective depolymerization of PCL to ε-CL with >99% monomer selectivity.
  • Excellent monomer yield of 93% was obtained under optimized conditions.
  • NMR and DFT studies elucidated the mechanism behind the catalyst's high selectivity.

Conclusions:

  • The designed (BisSalen)Al catalysts enable efficient and selective chemical recycling of PCL to ε-CL.
  • Catalyst structure, specifically the confined cavity, is critical for directing depolymerization selectivity.
  • This research offers valuable guidance for designing advanced catalysts for targeted polymer monomer recovery.