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Binary Silicone Elastomeric Systems with Stepwise Crosslinking as a Tool for Tuning Electromechanical Behavior.

Adrian Bele1, Liyun Yu2, Mihaela Dascalu1

  • 1"Petru Poni" Institute of Macromolecular Chemistry, 700487 Iasi, Romania.

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|January 11, 2022
PubMed
Summary

This study introduces interpenetrating polymer networks (IPNs) made from two silicone elastomers. The novel combination improves mechanical and dielectric properties, offering a versatile material for various applications.

Keywords:
dielectric elastomer transducersinterpenetrating polymer networkssilicone elastomerswave energy harvesting

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Interpenetrating polymer networks (IPNs) offer tunable properties through network synergism.
  • Silicone elastomers are versatile materials with potential for property enhancement via IPNs.

Purpose of the Study:

  • To develop a novel IPN system using two distinct silicone-based networks.
  • To investigate the synergistic effects of combining condensation-cured and UV-cured silicone networks.
  • To characterize the mechanical, thermal, and dielectric properties of the resulting IPNs.

Main Methods:

  • Synthesized IPNs by mixing two silicone networks with different curing mechanisms (condensation and UV).
  • Varied the ratios of the two networks in the IPN formulations.
  • Evaluated mechanical properties (elongation, Young's modulus), thermal properties (glass transition temperature), dielectric strength, and toughness.

Main Results:

  • Achieved significantly improved mechanical properties, including elongations up to 720% and a Young's modulus of 1 MPa.
  • Observed a single, distinct glass transition temperature of approximately -123 °C.
  • Demonstrated good dielectric strength (~50 V/μm) and toughness (63 kJ/m³).

Conclusions:

  • The developed IPNs exhibit enhanced mechanical and dielectric performance.
  • The combination of different curing routes in silicone IPNs leads to beneficial synergistic effects.
  • These novel silicone IPNs show promise for applications requiring robust and reliable elastomeric materials.