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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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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: 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.
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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Radical Chain-Growth Polymerization: Mechanism01:09

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Radical Chain-Growth Polymerization: Overview01:10

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radical Chain-Growth Polymerization: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Dynamic shift of internal electric field accelerates enzymatic polyethylene terephthalate depolymerization.

Mingna Zheng1, Jinfeng Chen2, Weiliang Dong3

  • 1Academician Workstation for Big Data in Ecology and Environment, Environment Research Institute, Shandong University, Qingdao, PR China.

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Summary
This summary is machine-generated.

Enzymatic recycling of polyethylene terephthalate (PET) using the LCCICCG hydrolase involves energy barriers for binding and release. The enzyme

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Area of Science:

  • Biochemistry and Molecular Biology
  • Computational Chemistry
  • Environmental Science

Background:

  • Enzymatic recycling of polyethylene terephthalate (PET) offers an eco-friendly solution to plastic waste.
  • Understanding the catalytic mechanism of PET-degrading enzymes is crucial for developing efficient biocatalysts.

Purpose of the Study:

  • To systematically explore the depolymerization mechanism of PET by the hydrolase LCCICCG using computational simulations.
  • To elucidate the role of the enzyme's internal electric field in catalysis.

Main Methods:

  • Quantum mechanics/molecular mechanics (QM/MM) molecular dynamics simulations were employed.
  • Free energy calculations were performed to map the reaction pathway.
  • Analysis of the enzyme's internal electric field dynamics was conducted.

Main Results:

  • Both PET chain binding and product release steps exhibit free energy barriers.
  • The rate-determining step is a catalytic process with a free energy barrier of 20.4 kcal·mol-1.
  • Dynamic variations in the enzyme's internal electric field stabilize the transition state, lowering the energy barrier.

Conclusions:

  • The study provides a detailed mechanistic insight into PET depolymerization by LCCICCG.
  • The dynamic internal electric field plays a significant role in enhancing catalytic efficiency.
  • These findings can guide the rational engineering of PET hydrolases for improved plastic recycling.