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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.
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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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Bioinspired All-Polyester Diblock Copolymers Made from Poly(pentadecalactone) and Poly(2-(2-hydroxyethoxy)benzoate):

Julia S Saar1, Karen Lienkamp1

  • 1Freiburg Center für Interactive Materials and Bioinspired Technologies (FIT) and Department of Microsystems Engineering (IMTEK), Albert-Ludwigs-Universität, Georges-Köhler-Allee 105, 79110 Freiburg, Germany.

Macromolecular Chemistry and Physics
|August 18, 2021
PubMed
Summary

Bioinspired diblock copolymers of poly(pentadecalactone) and poly(2-(2-hydroxyethoxy)-benzoate) were synthesized. These novel materials exhibit tunable mechanical properties and retained thermal characteristics of their parent homopolymers.

Keywords:
aliphatic-aromatic block copolymersbioinspired polymerscopper-catalyzed azide-alkyne cycloaddition reactionfilm formation

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Bioinspired Materials

Background:

  • Diblock copolymers offer unique properties by combining distinct polymer blocks.
  • Bioinspired polymers are of interest for advanced applications.
  • Controlled synthesis of well-defined block copolymers is crucial.

Purpose of the Study:

  • To synthesize novel bioinspired diblock copolymers of poly(pentadecalactone) and poly(2-(2-hydroxyethoxy)-benzoate).
  • To investigate the structural, mechanical, and thermal properties of the synthesized copolymers.
  • To explore different synthetic strategies for achieving controlled block copolymer architectures.

Main Methods:

  • Ring-opening polymerization (ROP) for synthesizing polymer blocks.
  • 1,3-dipolar Huisgen reaction ("click-chemistry") for modular synthesis.
  • Proton NMR, FTIR, and GPC for structural characterization.
  • Atomic Force Microscopy (AFM) for morphological and nanomechanical analysis.
  • Differential Scanning Calorimetry (DSC) for thermal property evaluation.

Main Results:

  • Successful synthesis of poly(pentadecalactone)-block-poly(2-(2-hydroxyethoxy)-benzoate) (PPDL-block-P2HEB) diblock copolymers.
  • Two synthetic approaches (sequential and modular) were employed, with the modular approach yielding broader composition ranges.
  • Synthesized copolymers showed tunable DMT moduli between 17.2 ± 1.8 MPa and 62.3 ± 5.7 MPa.
  • Thermal properties, including melting and glass transition temperatures, were retained from the parent homopolymers.

Conclusions:

  • Well-defined bioinspired diblock copolymers with tunable mechanical properties were successfully synthesized.
  • The modular synthesis approach using click chemistry provides a versatile route for creating these copolymers.
  • The resulting materials hold promise for applications requiring specific mechanical and thermal performance.