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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.
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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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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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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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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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Updated: Mar 17, 2026

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Tailoring enzymes for polyester-plastic depolymerization.

Yuantao Chen1, Xijing He1, Jinyuan Yan1

  • 1Key Laboratory for Waste Plastics Biocatalytic Degradation and Recycling, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211800, PR China.

Journal of Hazardous Materials
|March 15, 2026
PubMed
Summary
This summary is machine-generated.

Protein engineering enhances plastic-degrading enzymes for efficient recycling. This review details advances in enzymes for polyethylene terephthalate (PET) and other plastics, crucial for tackling pollution.

Keywords:
Catalytic efficiencyPolyester-plastic biodegradationProtein engineeringProtein expressionThermostability

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Polymer Science

Background:

  • Plastic waste accumulation presents a significant global environmental challenge.
  • Enzymatic depolymerization offers a sustainable and green approach to plastic waste management.
  • Protein engineering is vital for optimizing enzymes to improve plastic degradation efficiency.

Purpose of the Study:

  • To review recent advancements in engineering enzymes for the depolymerization of plastics.
  • To highlight improvements in enzyme thermal stability, catalytic efficiency, and protein expression.
  • To identify future research directions for developing effective biocatalysts for plastic pollution.

Main Methods:

  • Review of literature on protein engineering of plastic-degrading enzymes.
  • Analysis of modifications enhancing enzyme performance for PET, PU, PLA, and PBAT.
  • Identification of strategies for improving recombinant protein expression and stability.

Main Results:

  • Engineered enzymes show enhanced thermal stability and catalytic efficiency for various plastics.
  • Improvements in recombinant protein expression facilitate large-scale enzyme production.
  • Specific examples of engineered enzymes for PET, PU, PLA, and PBAT depolymerization are discussed.

Conclusions:

  • Protein engineering is a powerful tool for creating efficient biocatalysts for plastic recycling.
  • Optimized enzymes are essential for the industrial viability of enzymatic plastic depolymerization.
  • Further research into enzyme modification is critical to address the plastic pollution crisis.