Polyether- and Tertiary Amine-Modified Silicone Surfactants: Synthesis and Surface Performance Across pH Ranges

Area of Science:

• Polymer Chemistry
• Surface Science
• Colloid Chemistry

Background:

• Polymerized silicone surfactants are crucial in various industrial applications.
• Enhancing their surface performance, especially across different pH conditions, remains a key challenge.
• Incorporating polyether and tertiary amine groups offers a potential route for improved functionality.

Purpose of the Study:

• To synthesize and characterize novel polymerized silicone surfactants modified with polyether and tertiary amine groups.
• To investigate the impact of these modifications on surface performance in aqueous solutions.
• To understand the influence of pH and structural variations on surfactant behavior.

Main Methods:

• Synthesis of PSiEO/(PO)-OH(CH3) surfactants.
• Structural characterization using 1H NMR and FTIR spectroscopy.
• Performance evaluation via static/dynamic surface tension, zeta potential, and dynamic light scattering.

Main Results:

• Modified silicone surfactants exhibited varied surface performances across a wide pH range.
• Micellization and adsorption were spontaneous, entropy-driven, and endothermic processes.
• Increasing pH and hydrophobic modification hindered these processes, altering aggregation behavior significantly.

Conclusions:

• Polymerized silicone surfactants modified with polyether and tertiary amine groups demonstrate tunable surface activity.
• The pH-dependent behavior and aggregation characteristics are critical for their application in diverse aqueous environments.
• These findings provide insights into designing advanced surfactants for specific surface-active applications.