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Related Concept Videos

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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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Environment-friendly transesterification to seawater-degradable polymers expanded: Computational construction guide

Mateusz Pokora1, Timo Rheinberger2, Frederik R Wurm2

  • 1International Center for Research on Innovative Biobased Materials (ICRI-BioM)-International Research Agenda, Lodz University of Technology, Żeromskiego 116, 90-924, Lodz, Poland.

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Researchers designed new biodegradable polyesters to combat marine plastic pollution. By incorporating specific "breaking points," these materials are engineered to degrade effectively in seawater, preventing microplastic formation.

Keywords:
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Area of Science:

  • Polymer Chemistry
  • Environmental Science
  • Computational Chemistry

Background:

  • Marine plastic pollution from non-biodegradable polymers is a significant global environmental issue.
  • Many current biodegradable polyesters exhibit slow degradation rates in marine environments, failing to mitigate plastic pollution effectively.

Purpose of the Study:

  • To design and computationally investigate novel biodegradable polyesters with enhanced seawater degradation capabilities.
  • To identify specific chemical structures and degradation mechanisms that promote rapid breakdown of polyesters in marine environments.

Main Methods:

  • Systematic design of a polylactide backbone incorporating various "breaking points" (phosphoesters, silicones, side-chain functional polyesters).
  • Simulation of degradation mechanisms, including SN2, Addition-Elimination (AE), and RNA-inspired pathways.
  • Computational analysis of the energetic favorability of different degradation mechanisms based on linker chemistry and pendant chain length.

Main Results:

  • Phosphorus-containing breaking points predominantly degrade via an RNA-inspired mechanism.
  • Silicon-containing linkers decompose through the Addition-Elimination (AE) mechanism.
  • Carbon-containing linkers degrade via the RNA-inspired mechanism with longer pendant chains (4 carbons) and AE with shorter chains.

Conclusions:

  • The study provides a computational framework for designing polyesters with tunable seawater degradability.
  • Incorporating specific breaking points, like phosphoesters or optimized carbon linkers, can lead to rapid degradation in marine environments.
  • These findings pave the way for developing advanced biodegradable materials to mitigate microplastic pollution.