How does polyurethane (PU) modify asphalt?

Label:chem

Topic
PU is a high molecular weight polymer formed from polyols, isocyanates, and chain extenders. It can be used to modify asphalt through in situ polymerization or melting methods.

From: "Application of isocyanate-based materials in asphalt pavement: A review", Journal of Road Engineering, Volume 5, Issue 2, June 2025, Pages 261-278
Answer
PU modifies asphalt by forming a spatial network structure through chemical reactions with active groups in asphalt and moisture in the air. This enhances the high-temperature stability, low-temperature ductility, and mechanical properties of the modified asphalt.
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