Plasticizer

material

A chemical additive that increases the flexibility, workability, and ductility of polymers by reducing intermolecular forces and lowering the glass transition temperature.

In Simple Terms

Plasticizers are chemicals added to rigid plastics to make them softer and more flexible. They work by inserting themselves between polymer chains, allowing them to move more freely. This creates materials that bend without breaking.

Why It Matters

Plasticizers enable the production of flexible products from inherently rigid polymers like PVC. They allow resin traders to offer materials with customized flexibility levels and help processors achieve specific mechanical properties for applications.

Technical Details

Plasticizers function by disrupting polymer chain packing and reducing intermolecular attractions. They typically have molecular weights between 200-600 g/mol and must be compatible with the base resin. Common types include phthalates, adipates, and citrates, with loading levels ranging from 20-50% by weight in flexible applications.

Real-World Examples

PVC resin specification

A resin trader sources rigid PVC compound with 35% DOP plasticizer for flexible tubing applications, requiring specific shore hardness values.

Quality control testing

Lab analysis confirms plasticizer content in incoming flexible PVC batches to ensure consistent elongation-at-break performance across production runs.

Processing optimization

Injection molder adjusts barrel temperatures when switching between rigid and plasticized PVC grades due to different melt flow characteristics.