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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.
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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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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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Updated: Jul 9, 2025

Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase
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The programmed sequence-based oxygenase screening for polypropylene degradation.

Qianlong Tan1, Wentao Chen1, Hong Liu1

  • 1Life and Science Department, Central South University of Forestry and Technology, Changsha, Hunan 410004, China; National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, Hunan 410004, China.

Journal of Hazardous Materials
|December 7, 2023
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new enzyme, HIS1, that can biodegrade polypropylene (PP) plastic. This breakthrough offers a promising solution for plastic recycling and reducing pollution from this resistant material.

Keywords:
Enzyme degradable plasticsMicroplasticMolecular dynamicsPolypropylene

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Area of Science:

  • Biotechnology
  • Environmental Science
  • Polymer Science

Background:

  • Polypropylene (PP) plastic is highly resistant to degradation due to its chemical inertness.
  • Effective recycling and pollution control methods for PP are urgently needed.

Purpose of the Study:

  • To identify and characterize novel enzymes capable of degrading polypropylene.
  • To investigate the mechanism of enzymatic polypropylene oxidation.

Main Methods:

  • Sequence screening using Hidden Markov Model (HMM) to identify potential enzymes.
  • Characterization of the identified dioxygenase (HIS1) for PP degradation.
  • Analysis of PP products treated with HIS1 to observe degradation effects.

Main Results:

  • A novel dioxygenase, HIS1, was identified and shown to be effective in oxidizing polypropylene.
  • HIS1 treatment resulted in surface damage (cracks and holes) on various PP products like films and microplastics.
  • Hydrophobic binding within the HIS1 enzyme's cavity was identified as the key driver for oxidative degradation.

Conclusions:

  • The discovery of HIS1 represents a significant advancement in the biodegradation of polypropylene.
  • HIS1 provides a promising candidate for enzyme evolution and selection in plastic recycling and pollution control efforts.