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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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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: 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: 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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Hydroboration-Oxidation of Alkenes03:08

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Carbamate-bond breaking on bulk oxides realizes highly efficient polyurethane depolymerization.

Xinbang Wu1, Roland C Turnell-Ritson1, Peijie Han2

  • 1Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.

Nature Communications
|May 9, 2025
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Summary
This summary is machine-generated.

This study introduces cerium oxide (CeO2) as a highly effective heterogeneous catalyst for polyurethane chemical recycling. CeO2 efficiently converts carbamate bonds, yielding valuable anilines and polyols for sustainable material recovery.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Catalysis

Background:

  • Polyurethane (PU) is a widely used plastic in various industries.
  • Chemical recycling of PU via catalytic hydrogenation offers a sustainable route to recover valuable monomers like anilines and polyols.
  • A lack of practical heterogeneous catalysts hinders the industrial-scale chemical recycling of PU.

Purpose of the Study:

  • To investigate heterogeneous metal-oxide catalysts for the chemical recycling of polyurethane.
  • To identify efficient catalysts for the cleavage of carbamate bonds in PU.
  • To propose a catalytic mechanism for PU depolymerization.

Main Methods:

  • Screening of various metal-oxide catalysts for the conversion of model carbamate compounds.
  • Activity testing under solvent-free hydrogenation and hydrogen-free transfer hydrogenation conditions.
  • In situ Nuclear Magnetic Resonance (NMR) studies and control reactions to elucidate the reaction mechanism.

Main Results:

  • Cerium oxide (CeO2) demonstrated superior catalytic activity, achieving 100% conversion and up to 92% yield of aniline products.
  • A volcano correlation was observed between catalyst acidity and carbamate bond cleavage activity.
  • CeO2's high performance is attributed to low oxygen vacancy formation energy and active Ce3+/Ce4+ redox pairs.

Conclusions:

  • CeO2 is a highly effective heterogeneous catalyst for the chemical recycling of polyurethanes.
  • The study proposes a mechanism for carbamate bond dissociation on CeO2.
  • CeO2 enables both solvent-free and transfer hydrogenation methods for depolymerizing thermoplastic and thermoset polyurethanes.