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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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: 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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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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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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Updated: Jun 24, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Regioselective enzymatic depolymerization of aromatic-aliphatic polyester revealed by computational modelling.

Mingna Zheng1, Yanwei Li1, Weiliang Dong2

  • 1Environment Research Institute, Shandong University, Qingdao 266237, PR China.

Journal of Hazardous Materials
|June 12, 2024
PubMed
Summary
This summary is machine-generated.

Enzymatic recycling of Poly(butylene adipate-co-terephthalate) (PBAT) plastic waste is explored. Computational analysis revealed a specific binding mode crucial for regioselective depolymerization by cutinase TfCutSI.

Keywords:
BiodegradationEnzyme engineeringHydrolasePoly(butylene adipate-co-terephthalate)Regioselectivity

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Area of Science:

  • Biochemistry and Materials Science
  • Focus on enzymatic degradation of polymers
  • Application in plastic waste management

Background:

  • Poly(butylene adipate-co-terephthalate) (PBAT) is a common plastic in packaging and films, contributing to global waste.
  • Enzymatic recycling offers a sustainable solution for PBAT waste management.
  • Understanding the depolymerization mechanism is key to optimizing enzyme-based recycling.

Purpose of the Study:

  • To systematically investigate the depolymerization mechanism of PBAT catalyzed by cutinase TfCutSI.
  • To elucidate the role of binding modes and enzyme-substrate interactions in regioselectivity.
  • To provide molecular insights for enhancing enzyme engineering for plastic recycling.

Main Methods:

  • Utilized molecular docking, molecular dynamics simulations, and QM/MM calculations.
  • Analyzed binding affinities and structural parameters influencing regioselectivity.
  • Compared experimental X-ray crystallography data with computational predictions.

Main Results:

  • Identified a regioselective depolymerization mechanism for PBAT with a 'chain-length' effect.
  • Specific substrate-enzyme distances (Substrate@O4-Met@H7 and Substrate@C1-Ser@O1) dictate regioselectivity.
  • A computationally predicted binding mode, not observed in X-ray crystallography, is critical for depolymerization.
  • Hydrogen bonding and the enzyme's electric field significantly influence product formation.

Conclusions:

  • Computational modeling is vital for refining experimental findings in enzyme-catalyzed plastic degradation.
  • Novel molecular insights into PBAT depolymerization provide a basis for enzyme engineering.
  • Optimized enzyme-PTAT interactions can enhance the efficiency of industrial plastic recycling.