Vibratory Ball Milling of Solid-State Flame-Retardant Polyelectrolyte Complex for Use in Polymer Emulsions

Area of Science:

• Materials Science
• Polymer Chemistry
• Flame Retardancy

Background:

• Flame retardants are crucial for polymer safety.
• Current flame retardants can have environmental concerns.
• Developing effective and safe flame-retardant additives is an ongoing challenge.

Purpose of the Study:

• To develop a novel flame-retardant additive using a polyelectrolyte complex (PEC).
• To reduce the particle size of PEC for effective incorporation into polymer emulsions.
• To evaluate the flame-retardant performance of the modified PEC.

Main Methods:

• Vibratory ball milling was employed to reduce the particle size of a polyallylamine/poly(sodium phosphate) PEC.
• The milled PEC was used as an additive in a polymer emulsion.
• The flame-retardant properties were assessed using UL 94 vertical flame testing.

Main Results:

• Particle size of the PEC was reduced by an order of magnitude.
• The polymer emulsion containing the PEC additive exhibited self-extinguishing behavior.
• A V-0 rating was achieved in UL 94 flame testing, indicating excellent flame retardancy.

Conclusions:

• Solid polyelectrolyte complexes (PECs) can be effectively utilized as flame-retardant additives.
• Vibratory ball milling is a viable method for preparing PECs for flame-retardant applications.
• This study presents a new approach for enhancing polymer safety with PEC-based additives.