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Related Concept Videos

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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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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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...
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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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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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Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Chemically Recyclable and Biodegradable Vulcanized Rubber.

Simon T Schwab1, Taylor F Nelson1, Stefan Mecking1

  • 1Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany.

ACS Sustainable Chemistry & Engineering
|April 26, 2024
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel recyclable and biodegradable rubber from unsaturated polyesters. This innovative material can be broken down into monomers, achieving over 90% recovery and demonstrating depolymerization and partial mineralization.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Sustainable Chemistry

Background:

  • Traditional vulcanized rubbers are difficult to recycle due to their cross-linked structure.
  • Vulcanization also hinders the biodegradation of rubber materials.
  • Existing recycling methods for rubber are often inefficient and environmentally taxing.

Purpose of the Study:

  • To develop a novel rubber material that is both recyclable and biodegradable.
  • To investigate the solvolysis and recovery of monomers from the new rubber.
  • To assess the biodegradation potential of the vulcanized polyester rubber.

Main Methods:

  • Vulcanization of amorphous, unsaturated polyesters to create elastic materials.
  • Solvolysis process to break down the rubber into constituent monomers.
  • Respirometric biodegradation experiments using 13CO2 tracking.
  • Recovery and quantification of monomers after solvolysis.

Main Results:

  • Achieved overall recycling rates exceeding 90% for the saturated monomers.
  • Demonstrated effective breakdown of the elastic material via solvolysis.
  • Confirmed depolymerization and partial mineralization through biodegradation experiments.

Conclusions:

  • The developed polyester-based rubber offers a viable alternative to traditional vulcanized rubbers.
  • This new material exhibits excellent recyclability and biodegradability.
  • The findings pave the way for more sustainable rubber applications in industries like tire manufacturing.