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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
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...
2.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
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...
3.6K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.2K
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.
8.2K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.0K
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...
3.0K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.2K

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Related Experiment Video

Updated: Sep 13, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

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Sustainable and Orthogonally Closed-Loop Recyclable Acetal-Based Long-Chain Polyesters.

Xiaomeng Li1, Zhitao Hu1, Mengxue Zhang1

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States.

Journal of the American Chemical Society
|July 28, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed new biobased poly(ester)acetals with tunable degradation for sustainable recycling. These polymers mimic polyethylene

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Polymers

Background:

  • Growing demand for biobased polymers to replace conventional plastics.
  • Need for novel polymers with enhanced functionalities like controlled degradation and recyclability.
  • Limitations of traditional recycling methods for commodity plastics.

Purpose of the Study:

  • To synthesize long-chain aliphatic poly(ester)acetals (PEAc) with orthogonal degradability.
  • To investigate the mechanical properties and adhesion characteristics of the synthesized PEAc.
  • To demonstrate a novel closed-loop recycling pathway for PEAc.

Main Methods:

  • Two-step synthesis: polycondensation of C18-diester with diols, followed by polytransacetalization.
  • Characterization of polymer mechanical properties, comparing them to low-density polyethylene.
  • Selective degradation studies under acidic, basic, and neutral conditions.
  • Repolymerization experiments to assess recyclability.

Main Results:

  • Synthesized PEAc with mechanical properties comparable to low-density polyethylene.
  • Achieved orthogonal depolymerization controllable by pH: acetal cleavage (acidic), ester hydrolysis (basic), and complete degradation (neutral).
  • Demonstrated strong adhesion (up to 17 MPa shear strength) and reusability on polar substrates like steel and wood.
  • Confirmed feasibility of closed-loop recycling via an "oligomer-polymer-oligomer" pathway.

Conclusions:

  • Developed high-performance, orthogonally recyclable biobased polymers.
  • PEAc offer a sustainable alternative to commodity plastics with tunable degradation and enhanced adhesion.
  • The novel recycling strategy reduces energy input and purification requirements compared to conventional methods.