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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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Hydrolysis01:15

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Hydrolysis is a chemical reaction in which the addition of water breaks down a polymer into its simpler monomer units. For example, peptides break into amino acids, carbohydrates into simple sugars, and DNA into nucleotides. Enzymes often facilitate these processes.
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Dehydration Synthesis01:15

Dehydration Synthesis

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Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
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Step-Growth Polymerization: Overview01:03

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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.
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Phosphodiester Linkages01:01

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Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
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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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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Complete Depolymerization and Repolymerization of a Sugar Poly(orthoester).

Lingyao Li1, Sampa Maiti1, Nicole A Thompson1

  • 1Department of Chemistry and Biochemistry, Science of Advanced Materials, Central Michigan University, Mount Pleasant, MI, 48858, USA.

Chemsuschem
|November 10, 2017
PubMed
Summary
This summary is machine-generated.

Sugar poly(orthoesters) can depolymerize into monomers for sustainable recycling. Acidic conditions typically yield a cyclic product, but this can be controlled to regenerate the original monomer for efficient repolymerization.

Keywords:
biopolymersdegradabledepolymerizationrepolymerizationsugar poly(orthoesters)

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Area of Science:

  • Polymer Chemistry
  • Sustainable Materials Science
  • Glycochemistry

Background:

  • The development of sustainable polymers is crucial for reducing environmental impact.
  • Sugar-based polymers, or glycopolymers, offer a renewable alternative to traditional plastics.
  • Poly(orthoesters) are a class of glycopolymers known for their acid-labile linkages, making them interesting for controlled degradation studies.

Purpose of the Study:

  • To investigate the acid-catalyzed depolymerization of sugar poly(orthoesters).
  • To identify the products formed during depolymerization and understand the underlying mechanisms.
  • To explore methods for controlling depolymerization to favor monomer regeneration for recycling.

Main Methods:

  • Acidolysis of a model sugar poly(orthoester).
  • Analysis of depolymerization products using spectroscopic and chromatographic techniques.
  • Chemical modification of intermediates to influence reaction pathways.
  • Demonstration of repolymerization of regenerated monomers.

Main Results:

  • Complete depolymerization of the sugar poly(orthoester) under acidic conditions was achieved.
  • The primary depolymerization product was a stable cyclic sugar derivative (1,6-anhydro glucopyranose), favored kinetically and thermodynamically.
  • A strategy involving chemical deactivation of a key intermediate successfully inhibited cyclic product formation, favoring the regeneration of the original monomer.
  • The regenerated monomer was efficiently repolymerized, demonstrating a viable recycling pathway.

Conclusions:

  • Sugar poly(orthoesters) can be effectively depolymerized under acidic conditions.
  • The depolymerization pathway can be steered to yield either a cyclic product or the original monomer.
  • Controlling depolymerization to regenerate the monomer enables sustainable recycling of these glycopolymers.