Multilayer films from phenolic resin-sodium dodecyl sulfate complex and polycations

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Developing stable multilayer ultrathin films is crucial for advanced applications.
• Weak hydrophobic interactions in traditional PR-SDS-PC films limit their solvent stability.
• Photosensitive materials offer pathways to enhance film durability.

Purpose of the Study:

• To fabricate novel multilayer ultrathin films using phenolic resin (PR) and sodium dodecyl sulfate (SDS) as a complex polyanion.
• To investigate the effect of different polycations (PCs) on film stability.
• To enhance the stability of PR-SDS-PC films using photosensitive polycations.

Main Methods:

• Fabrication of multilayer ultrathin films via layer-by-layer assembly.
• Utilizing a complex of phenolic resin (PR) and sodium dodecyl sulfate (SDS) as the polyanion.
• Employing various polycations (PCs), including photosensitive diazo resin (DR).
• Assessing film stability through immersion in polar organic solvents and UV irradiation.

Main Results:

• Films fabricated with PR-SDS-PC showed rapid etching in polar organic solvents due to weak hydrophobic interactions.
• Incorporating photosensitive diazo resin (DR) as the polycation significantly improved film stability.
• UV irradiation induced covalent crosslinking in the PR-SDS-DR films, enhancing their structural integrity.

Conclusions:

• The stability of ultrathin films can be significantly enhanced by employing photosensitive polycations.
• UV-induced covalent crosslinking provides a robust method for stabilizing PR-SDS-DR multilayer films.
• This approach offers a promising strategy for developing durable ultrathin films for various applications.