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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

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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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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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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Olefin Metathesis Polymerization: Overview01:13

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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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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.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Monomer-Recyclable Polyester from CO2 and 1,3-Butadiene.

Jialin Xu1, Yuxuan Niu1, Bo-Lin Lin1

  • 1School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, China.

Macromolecular Rapid Communications
|May 1, 2024
PubMed
Summary

This study presents a novel catalytic system for the selective ring-opening polymerization of a CO2-derived lactone, enabling the creation of recyclable polyesters. This breakthrough addresses challenges in plastic pollution and CO2 reduction.

Keywords:
CO2 based polyesterCO2 utilizationdisubtituted six‐membered lactone with conjugated olefinring‐opening polymerization

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials
  • Catalysis

Background:

  • CO2 utilization for polyester synthesis offers a sustainable alternative to traditional plastics.
  • Direct copolymerization of CO2 and olefins is kinetically challenging.
  • Ring-opening polymerization (ROP) of a lactone intermediate (δ-L) is a promising route, but faces Michael addition side reactions.

Purpose of the Study:

  • To develop a selective ROP method for the δ-L lactone.
  • To overcome Michael addition side reactions during polymerization.
  • To enable efficient monomer recycling for CO2-derived polyesters.

Main Methods:

  • Utilized a catalytic system combining an organobase and a specific urea derivative.
  • Investigated the effect of urea substituent modifications on catalytic selectivity.
  • Performed ROP of the δ-L lactone intermediate.

Main Results:

  • Achieved the first example of selective ROP of the δ-L lactone.
  • Demonstrated that electron-deficient aryl groups on the urea catalyst enhance selectivity.
  • Successfully recovered the monomer from oligo(δ-L) under mild conditions.

Conclusions:

  • Developed a highly selective catalytic system for ROP of CO2-derived lactones.
  • The findings pave the way for producing monomer-recyclable polyesters from CO2.
  • This research contributes to reducing plastic pollution and CO2 emissions.