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Related Concept Videos

Polymers02:34

Polymers

35.7K
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...
35.7K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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...
2.7K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.8K
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.
7.8K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
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...
2.1K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.5K
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...
3.5K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.2K
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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Updated: Jun 28, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Polymers from Plant Oils Linked by Siloxane Bonds for Programmed Depolymerization.

Chen Cheng1, Jake X Shi1,2, Eun-Hye Kang1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|April 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces novel, biobased polymers incorporating siloxane bonds for controlled depolymerization and repolymerization, offering a circular economy approach to plastic waste reduction and sustainable material development.

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Growing plastic waste and reliance on fossil fuels necessitate sustainable alternatives.
  • Development of polymers from renewable resources is crucial for environmental protection.
  • Controlled depolymerization and repolymerization are key to achieving polymer circularity.

Purpose of the Study:

  • To synthesize novel polymers from renewable feedstocks using siloxane linkages.
  • To investigate the controlled depolymerization and repolymerization of these polymers.
  • To evaluate the environmental degradation and microbial metabolism of the developed polymers.

Main Methods:

  • Synthesis of siloxane-containing α,ω-diesters and α,ω-diols from castor oil-derived alkenoic esters.
  • Polymerization with biobased monomers and ring-opening polymerization of macrolactones.
  • Programmed depolymerization in protic solvents or with acid catalysis.
  • Enzymatic degradation assays and 13C-labeled monomer metabolism studies.

Main Results:

  • Successfully synthesized and polymerized siloxane-containing monomers and copolymers.
  • Achieved controlled depolymerization into monomers, enabling repolymerization and demonstrating circularity.
  • Demonstrated enzymatic hydrolysis by a fungal cutinase and differential microbial metabolism of polymer components.

Conclusions:

  • The developed siloxane-containing polymers offer a promising route to sustainable and circular plastics.
  • These materials exhibit controlled degradation pathways, addressing plastic waste accumulation.
  • The study highlights the potential of biobased feedstocks and innovative polymer design for a circular economy.