Bio-Degradable Polyurethane Foams Produced by Liquefied Polyol from Wheat Straw Biomass.

Area of Science:

• Materials Science
• Polymer Chemistry
• Sustainable Chemistry

Background:

• Polyurethane foams often rely on petroleum-based or non-renewable resources.
• Castor oil is a common polyol source, but sustainable alternatives are sought.
• Agricultural waste streams represent an underutilized resource for material synthesis.

Purpose of the Study:

• To synthesize a polyol from wheat straw as a substituent for castor oil in polyurethane foams.
• To evaluate the properties and performance of polyurethane foams formulated with wheat straw polyol.
• To explore the potential of these novel foams for agricultural applications.

Main Methods:

• Liquefaction of wheat straw to produce polyol.
• Formulation of polyurethane foams using wheat straw polyol (up to 50%) and two isocyanates (MDI and TDI).
• Characterization of physical, mechanical, thermal, and morphological properties.
• Assessment of biodegradability in soil media.

Main Results:

• Wheat straw polyol demonstrated excellent properties for polyurethane foam production.
• Optimal performance was achieved with up to 40% wheat straw polyol substitution.
• Foams exhibited improved physical, mechanical, and thermal properties with a compact morphology.
• Significant biodegradability was observed within 60 days (up to 9.88%).

Conclusions:

• Wheat straw can be effectively converted into a viable polyol for polyurethane foams.
• The developed polyurethane foams offer a sustainable and high-performing alternative to conventional foams.
• These eco-friendly foams show promise for agricultural applications, such as in plant nurseries.