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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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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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Anionic Chain-Growth Polymerization: Overview01:20

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Polymer Classification: Crystallinity01:21

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Recyclable and Degradable Ionic-Substituted Long-Chain Polyesters.

Anne Saumer1, Stefan Mecking1

  • 1Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78457 Konstanz, Germany.

ACS Sustainable Chemistry & Engineering
|August 25, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed recyclable, plant-oil-based polyesters with polyethylene-like properties. These ion-containing polymers offer tunable mechanical and surface characteristics, enabling easier printing and chemical recycling.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Polymers

Background:

  • Apolar polymers like polyethylene can gain desirable properties, such as adhesion, through ionic groups.
  • Current ethylene copolymers lack degradability and chemical recyclability due to their all-carbon backbones.

Purpose of the Study:

  • To synthesize and characterize ion-containing long-chain polyesters from plant oils.
  • To investigate the impact of ionic groups and cation counterions on polymer properties.
  • To assess the degradability and chemical recyclability of these novel polyesters.

Main Methods:

  • Synthesis of ion-containing long-chain polyesters with low ionic content (<0.5 mol %).
  • Characterization of structural and mechanical properties, including HDPE-like behavior.
  • Evaluation of cation counterion effects (Mg2+, Ca2+, Zn2+) on mechanical properties and melt rheology.
  • Assessment of water absorption, abiotic degradation, surface wettability, and printability.
  • Demonstration of chemical recyclability via methanolysis.

Main Results:

  • Polyesters synthesized from plant oils exhibit HDPE-like structural and mechanical properties.
  • Cation counterions significantly influence mechanical properties and melt rheology.
  • Acid-containing polyesters show water absorption and abiotic degradation.
  • Enhanced surface wettability facilitates printing.
  • Methanolysis allows for depolymerization into neat long-chain monomers, indicating recyclability.
  • Neutralized sulfonate polyesters demonstrate improved surface properties and adsorption capability.

Conclusions:

  • Tunable, recyclable polyethylene-like polymers can be synthesized from plant oils.
  • The incorporation of ionic groups and careful selection of cations allow for property modification.
  • These materials offer a sustainable alternative with potential for diverse applications.