Solid-State Polycondensation (SSP) Principle

Solid-State Polycondensation (SSP), also known as Solid Phase Viscosification , is a polycondensation reaction carried out in a solid state, the polyester prepolymer with a certain molecular weight is heated to its melting point below the glass transition temperature above (usually 10~40 ℃ below the melting point), through vacuum or inert gas protection to take away small molecular products, so that the polycondensation reaction is continued. Polycondensation occurs due to spherical regions and emits effective collisions.

The advantage of Solid-State Polycondensation is that it can achieve the improvement of polymer molecular weight under low temperature and energy consumption, and the requirements for equipment are relatively low, and the product quality is stable, which is conducive to environmental protection and safe production.