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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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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.
Many natural and synthetic polymers are produced by...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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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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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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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Updated: Nov 17, 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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Current Technologies in Depolymerization Process and the Road Ahead.

Yu Miao1, Annette von Jouanne2, Alexandre Yokochi2

  • 1School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.

Polymers
|February 12, 2021
PubMed
Summary
This summary is machine-generated.

Plastic pollution demands innovative solutions. This paper explores depolymerization methods to convert waste plastics into fuels or monomers, offering a sustainable alternative to landfilling and reducing fossil fuel dependence.

Keywords:
plastic depolymerization and recyclingplastic depolymerization challengesplastic pollution

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Area of Science:

  • Environmental Science
  • Materials Science
  • Chemical Engineering

Background:

  • Plastic pollution is a significant global environmental issue due to high accumulation rates and inadequate management.
  • International policies, like the Chinese import ban on plastic waste, necessitate advanced waste management strategies.
  • Current plastic waste management faces challenges, driving the need for effective recycling and disposal solutions.

Purpose of the Study:

  • To critically assess the current state of plastic pollution.
  • To review diverse plastic depolymerization techniques categorized by polymer type (SPI codes).
  • To analyze future opportunities and challenges in plastic waste management and recycling.

Main Methods:

  • Literature review of plastic pollution and its environmental impact.
  • Analysis of various depolymerization methods for different plastic resin types (SPI codes).
  • Examination of energy recovery and chemical recycling pathways for plastic waste.

Main Results:

  • Depolymerization offers a viable route to convert waste plastics into valuable fuels and monomers.
  • Different polymer types require specific depolymerization approaches for optimal efficiency.
  • Successful implementation faces technical, economic, and logistical challenges.

Conclusions:

  • Plastic depolymerization presents a promising solution for mitigating plastic pollution and reducing reliance on fossil fuels.
  • Further research and development are crucial to overcome existing challenges and scale up depolymerization technologies.
  • A circular economy approach, integrating depolymerization, is essential for sustainable plastic waste management.