Synthesis of Polyhydroxyurethanes-Experimental Verification of the Box-Behnken Optimization Model

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Polyurethanes are widely used industrial polymers.
• Traditional polyurethane synthesis involves hazardous diisocyanates.
• Non-isocyanate polyurethanes (NIPU) offer a safer alternative.

Purpose of the Study:

• To synthesize polyhydroxyurethanes (PHUs) from cyclic carbonates.
• To investigate the influence of synthesis parameters on PHU properties.
• To establish a predictive model for PHU characteristics.

Main Methods:

• Utilized a three-factor, three-level Box-Behnken experimental design.
• Varied reaction time, temperature, and molar ratios of reagents.
• Analyzed viscosity, mechanical properties, and glass transition temperature (Tg).

Main Results:

• Viscosity was influenced by reaction time, temperature, and molar ratios.
• Mechanical properties and Tg were primarily affected by reagent molar ratios.
• Experimental verification confirmed model accuracy with minor deviations (15% for mechanical strength, 7% for Tg).

Conclusions:

• Optimized synthesis of PHUs from cyclic carbonates is achievable.
• Reagent molar ratios are critical for tailoring PHU mechanical properties and Tg.
• The developed model accurately predicts PHU characteristics, enabling efficient material design.