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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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Structure and Nomenclature of Ethers02:28

Structure and Nomenclature of Ethers

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Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent...
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Physical Properties of Ethers02:17

Physical Properties of Ethers

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Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
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Structure and Nomenclature of Epoxides02:38

Structure and Nomenclature of Epoxides

8.1K
Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain...
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Characteristics and Nomenclature of Homopolymers01:00

Characteristics and Nomenclature of Homopolymers

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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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Related Experiment Video

Updated: Mar 3, 2026

Extraction of Lignin with High &#946;-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

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Structure-Property Relationships of Lignin-Derived Semiaromatic Poly(ether ester)s.

Ryan K Maynard1,2, Kush G Patel3,2, Huiming Wu1,2

  • 1Department of Chemistry, Franklin College of Arts and Sciences, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States.

Macromolecules
|March 2, 2026
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Summary

Researchers developed novel bioderived semiaromatic polyesters from lignin, offering a sustainable alternative to petroleum-based polymers. These materials show excellent thermal stability and recyclability.

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Quantitative 31P NMR Analysis of Lignins and Tannins
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Quantitative 31P NMR Analysis of Lignins and Tannins
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Petroleum-derived semiaromatic polyesters are widely used but face sustainability challenges.
  • Replacing petroleum-based aromatics with cost-competitive bioderived monomers is a significant hurdle in polymer science.

Purpose of the Study:

  • To synthesize and characterize novel semiaromatic polyesters from bioderived monomers.
  • To evaluate the thermal, mechanical, and rheological properties of these new polymers.
  • To demonstrate the chemical recyclability of the synthesized polyesters.

Main Methods:

  • Synthesis of nine different polyesters from lignin-derived AB monomers (phloretic, coumaric, ferulic acids and derivatives) at >50 g scale.
  • Comprehensive characterization including thermal analysis, tensile testing, and melt rheology.
  • Construction of time-temperature superposition (TTS) master curves for seven polyesters.

Main Results:

  • Polymers exhibit excellent thermal stability with glass transition temperatures (Tg) ranging from 16-65 °C.
  • Tensile moduli varied from 4.6 to 1200 MPa, and elongation at break ranged from 7.5% to over 3800%.
  • Analysis revealed insights into packing length and characteristic ratio, with successful chemical recycling to monomer in high yield.

Conclusions:

  • Bioderived semiaromatic polyesters synthesized from lignin offer a promising sustainable alternative.
  • The synthesized polymers possess a wide range of tunable thermal and mechanical properties.
  • These polyesters are readily chemically recyclable, contributing to a circular economy.