Crosslinked Poly(2-oxazoline)s as "Green" Materials for Electronic Applications

Area of Science:

• Polymer Chemistry
• Materials Science
• Dielectric Spectroscopy

Background:

• Poly(2-oxazoline)s are synthesized from renewable fatty acid-derived monomers.
• UV-induced thiol-ene reaction enables crosslinking of these (co)poly(2-oxazoline)s.
• Understanding dielectric properties is crucial for electronic insulation applications.

Purpose of the Study:

• To synthesize and characterize crosslinked (co)poly(2-oxazoline) networks.
• To investigate the dielectric properties (complex permittivity, loss factor, conductivity) of these networks.
• To evaluate their potential as sustainable alternatives to polyamides in electronic insulation.

Main Methods:

• Cationic ring-opening polymerization for (co)poly(2-oxazoline) synthesis.
• UV-induced thiol-ene reaction for network formation.
• Dielectric spectroscopy to measure complex permittivity and loss factor over a wide frequency and temperature range.
• Electrical conductivity measurements.

Main Results:

• Complex permittivity increases with temperature and decreases with network density.
• Interfacial polarization explains changes in permittivity and loss factor.
• Permittivity values range from 4.29 to 4.97 at 20 °C and 50 Hz.
• Loss factors range from 0.030 to 0.093 at 20 °C and 50 Hz.
• Electrical conductivities range from 5 × 10⁻¹² to 8 × 10⁻⁹ S/m, classifying them as medium insulators.

Conclusions:

• Crosslinked (co)poly(2-oxazoline)s exhibit dielectric properties similar to polyamides.
• These materials are suitable for electronic insulation applications.
• They represent promising "green" alternatives to conventional polyamides.