What are the effects of plasticizer migration on the flexibility of aged PVC?

Plasticizer migration is a critical factor affecting the flexibility of aged PVC (polyvinyl chloride). Over time, plasticizers—chemical additives that enhance PVC's pliability—tend to migrate to the surface or evaporate, leading to a gradual loss of elasticity. This process accelerates under exposure to heat, UV radiation, or mechanical stress, causing the material to become brittle and prone to cracking.

The primary consequence of plasticizer migration is reduced flexibility, as the polymer matrix loses its ability to absorb stress. This degradation not only compromises the material's performance but also shortens its lifespan in applications like cables, flooring, and medical devices. Studies show that higher temperatures and prolonged aging exacerbate plasticizer loss, further diminishing PVC's mechanical properties.

To mitigate these effects, manufacturers often use more stable plasticizers or additives that slow migration. Understanding this phenomenon helps in designing durable PVC products for long-term use.