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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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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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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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Hydrolysis01:15

Hydrolysis

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Overview
Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
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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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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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Enzymes' Power for Plastics Degradation.

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Enzyme-based biocatalysis offers a promising bio-based solution for plastic waste. These polymer-assimilating enzymes are key to developing a circular plastic economy and reducing environmental pollution.

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Polymer Science

Background:

  • Increasing global plastic production poses significant environmental challenges.
  • Current plastic waste management relies heavily on landfilling and incineration, with limited recycling.
  • There is a growing need for sustainable, bio-based solutions for plastic waste treatment.

Purpose of the Study:

  • To review recent advancements in enzyme-based biocatalysis for plastic waste.
  • To discuss the design of biocatalytic processes for recycling and upcycling commodity plastics.
  • To explore the scope, limitations, challenges, and opportunities in enzyme-based plastic degradation.

Main Methods:

  • Comprehensive literature review of enzyme-based biocatalysis for plastics.
  • Analysis of recent progress in degrading polyesters, polyamides, polyurethanes, and polyolefins.
  • Discussion of biocatalytic process design for plastic recycling and upcycling.

Main Results:

  • Significant progress has been made in developing enzyme-based methods for plastic degradation over the past decade.
  • Enzyme-based biocatalysis is applicable to a range of commodity plastics.
  • Various biocatalytic approaches show potential for plastic recycling and upcycling.

Conclusions:

  • Enzyme-based biocatalysis is a viable and emerging strategy for sustainable plastic waste management.
  • Polymer-assimilating enzymes are crucial for achieving a circular plastic economy.
  • Further research and development are needed to overcome challenges and fully realize the opportunities in this field.