Photocurable Hypervalent Fluorinated Sulfur Containing Thin Films with Remarkable Hardness and Modulus

Area of Science:

• Polymer Chemistry
• Materials Science
• Organic Synthesis

Background:

• Developing advanced polymer films with enhanced mechanical properties is crucial for various technological applications.
• Existing materials often face limitations in hardness, modulus, and stress resistance.

Purpose of the Study:

• To synthesize novel tetrafluoro-λ⁶-sulfanyl-containing oligomers.
• To investigate the structure-property relationships of thin films derived from these oligomers.
• To evaluate the mechanical performance and adhesion of the resulting polymer coatings.

Main Methods:

• Visible light-promoted addition reactions to synthesize tetrafluoro-λ⁶-sulfanyl oligomers.
• Spin casting techniques for thin film preparation.
• Mechanical property testing (Young's modulus, hardness) and surface adhesion assessment.
• UV irradiation for film curing.

Main Results:

• Successful synthesis of tetrafluoro-λ⁶-sulfanyl-containing oligomers.
• Formation of hard, stress-resistant thin films with Young's moduli up to 60 GPa.
• Measured hardness values (1.57–2.77 GPa) significantly exceeding those of PMMA.
• UV-cured films demonstrated remarkable hardness, modulus, and good adhesion to silicon substrates.

Conclusions:

• Tetrafluoro-λ⁶-sulfanyl oligomers are effective precursors for high-performance polymer films.
• The synthesized materials offer superior mechanical properties, including exceptional hardness and modulus.
• These novel polymers show promise for applications requiring durable and resistant coatings.