Recent Progress of Non-Isocyanate Polyurethane Foam and Their Challenges.

Area of Science:

• Polymer Chemistry
• Materials Science
• Green Chemistry

Background:

• Polyurethane foams (PUFs) are versatile materials with widespread applications due to their excellent properties.
• Conventional PUF synthesis relies on isocyanates, posing toxicity concerns and driving research into safer alternatives.
• Isocyanate-free polyurethane foams (NIPUFs) are emerging as a sustainable and less toxic option.

Purpose of the Study:

• To review the synthesis of isocyanate-free polyurethane foams (NIPUFs).
• To explore various blowing agents and self-blowing techniques for NIPUF production.
• To highlight the potential of bio-derived NIPUFs.

Main Methods:

• Review of literature on NIPUF synthesis.
• Analysis of polyaddition reactions involving cyclic carbonates and polyfunctional amines.
• Assessment of external blowing agents (e.g., Poly(methylhydrogensiloxane), fluorohydrocarbons) and self-blowing techniques.
• Examination of bio-derived NIPUF formulations.

Main Results:

• The polyaddition of cyclic carbonates and amines is a viable route to NIPUFs.
• External blowing agents like Poly(methylhydrogensiloxane) and self-blowing methods enable NIPUF formation.
• Bio-derived NIPUFs, including self-blown and externally blown variants, are achievable.

Conclusions:

• Isocyanate-free polyurethane foams offer a promising, safer alternative to traditional PUFs.
• Diverse blowing strategies, including self-blowing, are effective for NIPUF production.
• The development of bio-derived NIPUFs contributes to sustainable materials innovation.