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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.
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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: 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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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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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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Recycling Polyurethanes through Transcarbamoylation.

Liang Zhao1, Vincent Semetey1

  • 1Chimie ParisTech, PSL University, CNRS, Institut de Recherche de Chimie Paris, 11 Rue Pierre et Marie Curie, 75005 Paris, France.

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|March 1, 2021
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Summary
This summary is machine-generated.

This study introduces a novel base-catalyzed transcarbamoylation method for recycling polyurethanes (PUs). The process efficiently depolymerizes PUs into valuable components for synthesizing new materials or recovering original monomers.

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Chemical Recycling

Background:

  • Polyurethanes (PUs) are widely used polymers facing recycling challenges.
  • Current recycling methods often lack efficiency or generate undesirable byproducts.
  • Developing sustainable and effective PU recycling strategies is crucial for environmental conservation.

Purpose of the Study:

  • To present a new base-catalyzed transcarbamoylation strategy for polyurethane recycling.
  • To demonstrate the depolymerization of PUs into useful chemical intermediates.
  • To evaluate the potential of this method for creating new PUs or recovering monomers.

Main Methods:

  • Depolymerization of polyurethanes using methanol/tetrahydrofuran as solvent.
  • Employing tert-butoxide as a base catalyst for transcarbamoylation.
  • Analysis of the depolymerized mixture containing O-dimethylcarbamates and polyols.

Main Results:

  • Successful qualitative depolymerization of polyurethanes was achieved.
  • The method yields a mixture of O-dimethylcarbamates and polyols.
  • These products can be utilized for synthesizing new PUs or recovering polyols and diisocyanates.

Conclusions:

  • The base-catalyzed transcarbamoylation offers a versatile and scalable approach for PU recycling.
  • High depolymerization outcomes indicate the method's efficiency.
  • This strategy presents an attractive solution for sustainable polyurethane waste management.