Crosslinked Fluorinated Poly(arylene ether)s with POSS: Synthesis and Conversion to High-Performance Polymers

Area of Science:

• Polymer Chemistry
• Materials Science
• Nanotechnology

Background:

• Poly(arylene ether)s are a versatile class of polymers known for their thermal stability.
• Incorporating polyhedral oligomeric silsesquioxane (POSS) into polymer backbones can enhance material properties.
• Fluorinated polymers often exhibit unique dielectric and hydrophobic characteristics.

Purpose of the Study:

• To synthesize novel crosslinked poly(arylene ether)s containing POSS in the main chain.
• To investigate the properties of these polymers, focusing on their dielectric behavior, chemical resistance, and thermal stability.
• To evaluate their potential for applications requiring advanced material performance.

Main Methods:

• Synthesis of fluorinated poly(arylene ether)s via nucleophilic substitution reactions using diphenol POSS and decafluorinated monomers (decafluorobiphenyl, decafluorobenzophenone, decafluorodiphenyl sulfone).
• End-capping of the polymers with 3-hydroxyphenyl acetylene to introduce phenylacetylene groups.
• Thermal treatment to induce crosslinking of the phenylacetylene-terminated polymers.
• Characterization of the crosslinked network's dielectric constant, dielectric loss, chemical resistance, and thermal properties.

Main Results:

• Successfully synthesized phenylacetylene-terminated poly(arylene ether)s with POSS in the main chain.
• The polymers demonstrated excellent processability prior to crosslinking.
• Upon heating, the polymers formed a crosslinked network with a low dielectric constant (2.17–2.58 at 1 MHz).
• The crosslinked materials exhibited strong resistance to chemical solutions, low dielectric losses, good thermal stability, and hydrophobic properties.

Conclusions:

• The developed poly(arylene ether)s with integrated POSS offer a promising combination of processability and high-performance characteristics after crosslinking.
• The low dielectric constant and excellent chemical resistance make these materials suitable for microelectronics and advanced coatings.
• The study highlights the effectiveness of incorporating POSS and phenylacetylene groups for creating high-performance crosslinked polymers.