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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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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,...
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Synthesis of Functional Water-Soluble Polyesters Based on Citric Acid and Dimethylolpropionic Acid.

Anna Kruglhuber1, Clemens Bernhard1, Susanne Boye2

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|April 13, 2026
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Summary

Researchers developed new water-soluble polyesters from citric acid, offering potential for biodegradable and recyclable materials. These functional polymers can be modified for applications in agriculture and biomedicine.

Keywords:
biobased monomerscharged polyestercitric acidfunctional polyestersulfonationwater-soluble polyester

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Sustainable Chemistry

Background:

  • Polyesters are promising renewable polymers due to biobased monomers and hydrolyzable ester bonds.
  • Citric acid is a readily available, biobased resource for synthesizing functional polyesters.
  • Developing recyclable and biodegradable polymers is crucial for environmental sustainability.

Purpose of the Study:

  • To synthesize water-soluble polyesters using citric acid and dimethylolpropionic acid.
  • To functionalize these polyesters by introducing carboxylate or sulfonate groups to enhance hydrophilicity.
  • To explore the potential of these polymers in agriculture and biomedicine.

Main Methods:

  • Melt polycondensation of citric acid and dimethylolpropionic acid at 150 °C.
  • Post-synthetic neutralization with KOH to introduce carboxylate moieties.
  • Synthesis of unsaturated polyesters with maleic anhydride followed by Michael addition of sodium sulfite for sulfonation.

Main Results:

  • Synthesized water-soluble polyesters with high amounts of free carboxylic acid groups (8 mmol g⁻¹) and molar masses up to 5200 g mol⁻¹.
  • Successfully incorporated tunable carboxylate and sulfonate groups to increase hydrophilicity.
  • Minimized molar mass reduction during aqueous neutralization and sulfonation procedures.

Conclusions:

  • Water-soluble polyesters with substantial functional groups were synthesized using biobased monomers.
  • The tunable nature of these polymers allows for modification for specific applications.
  • These polyesters show high potential as precondensates for biodegradable, water-absorbing materials in agriculture and biomedicine.