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Nitrile-Functionalized Polysiloxanes with Controlled End Groups for Elastomeric Networks.

Jana Wolf1,2, Patrick M Danner1,2, Dorina M Opris1,2

  • 1Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa), Ueberlandstrasse 129, 8600 Dübendorf, Switzerland.

ACS Polymers Au
|October 13, 2025
PubMed
Summary
This summary is machine-generated.

We developed a new method for synthesizing high-permittivity polysiloxanes with controlled molecular weights and end groups. This approach minimizes cyclic byproducts, enhancing their suitability for advanced material applications.

Keywords:
controlled end groupselastomernitrile polysiloxanepolar polysiloxanetelechelic polymer

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • High-permittivity polysiloxanes are crucial for dielectric actuators, sensors, energy devices, and electrolytes.
  • A key challenge is synthesizing these polymers with precise end-group control and minimal cyclic content.

Purpose of the Study:

  • To develop a synthesis method for polar polysiloxanes with controlled molecular weights and end groups.
  • To minimize cyclic byproduct formation during polysiloxane synthesis.

Main Methods:

  • Hydrolysis-condensation of (3-cyanopropyl)-methyldichlorosilane under solvent-free conditions.
  • Anionic ring-opening polymerization of isolated cyclic polysiloxanes.
  • Quantitative conversion of silanol end groups to aminopropyl or vinyl groups.

Main Results:

  • Achieved high-molecular-weight polysiloxanes (up to 25 kg mol⁻¹) with reduced cyclic content (11% after toluene extraction).
  • Demonstrated quantitative conversion of silanol end groups to aminopropyl (100%) and vinyl (92%) groups.
  • Successfully synthesized polysiloxanes with 3-cyanopropyl side groups and controlled end-group functionality.

Conclusions:

  • Solvent-free synthesis offers superior control over molecular weight and cyclic content in polysiloxanes.
  • The developed method enables the production of functionalized polysiloxanes for controlled cross-linking into elastic networks.
  • These tailored polysiloxanes show promise for advanced dielectric and energy applications.