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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 polymer...
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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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Polymers02:34

Polymers

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Polymers

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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.
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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.
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Modulation of Depolymerizable Poly(thioether-thioester) Properties in Reversible Covalent Composites.

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    This study introduces a novel recyclable plastic using thiol-functionalized silica particles and thiolactone polymerization. The resulting composite material demonstrates tunable properties and can be chemically recycled into its original monomer.

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    Area of Science:

    • Materials Science
    • Polymer Chemistry
    • Sustainable Plastics

    Background:

    • Developing recyclable polymer composites is crucial for reducing plastic waste.
    • Thiol-functionalized silica particles offer potential as macroinitiators for controlled polymerization.

    Purpose of the Study:

    • To create a novel, recyclable polymer composite material using thiol-functionalized silica particles and thiolactone ring-opening polymerization.
    • To investigate the tunability of material properties and the recyclability of the composite.

    Main Methods:

    • Incorporation of thiol-functionalized silica particles as macroinitiators.
    • Ring-opening polymerization of thiolactones.
    • Photochemical cross-linking for enhanced stability.
    • Chemical depolymerization and monomer recovery using thiol and DBU base.
    • Repolymerization and photo-cross-linking of recovered monomer.

    Main Results:

    • Successful synthesis of polymer composites with tunable thermal and mechanical properties.
    • Demonstration of 3D printability for a representative formulation.
    • Efficient chemical recycling yielding substantial monomer recovery.
    • Repolymerized material exhibited mechanical properties similar to the virgin composite.

    Conclusions:

    • The developed system offers a modular approach to creating recyclable polymer composites.
    • The reliable bond-forming and bond-breaking steps highlight its potential as a new class of recyclable plastics.