Tailored Dynamic Viscoelasticity of Polyurethanes Based on Different Diols.

Area of Science:

• Polymer Science
• Materials Science
• Rheology

Background:

• Growing demand for customized damping and tire materials.
• Polyurethane's (PU) designable molecular structure offers potential for tailored properties.
• Dynamic viscoelasticity is a critical performance parameter for polymers.

Purpose of the Study:

• To investigate methods for customizing the dynamic viscoelasticity of polyurethane.
• To explore the relationship between molecular structure and viscoelastic properties in PU.
• To establish a framework for precise control over PU material performance.

Main Methods:

• Systematic variation of soft segment flexibility.
• Selection of chain extenders with diverse chemical structures.
• Analysis of molecular structure, micro-phase separation, and dynamic viscoelasticity (loss peak temperature, modulus).

Main Results:

• Adjusting soft segment flexibility shifted the loss peak temperature between -50 °C and 14 °C.
• More regular chain extender structures increased soft-hard segment interaction and micro-phase separation.
• Modifying chain extender molecular weight precisely controlled the loss peak temperature from -1 °C to 13 °C.

Conclusions:

• Tailoring soft segment and chain extender characteristics enables precise control over PU dynamic viscoelasticity.
• Optimized micro-phase separation is key to achieving desired material properties.
• This research provides a novel approach for developing advanced PU materials for specific applications.