Long, flexible polyol chains that provide elasticity and low-temperature flexibility.

R−NCO+R′−OH→R−NH−CO−O−R′cap R minus NCO plus cap R prime minus OH right arrow cap R minus NH minus CO minus O minus cap R prime

Polyurethanes are typically produced via a between two primary components:

Flexible foams provide the primary cushioning for mattresses and upholstered furniture.

These segments naturally separate into distinct domains, giving PU a unique balance of toughness and extensibility. 3. Industrial Applications

Rigid foams serve as high-performance thermal insulation for roofs and walls, significantly reducing energy consumption.