Modelling of additive diffusion in polyolefins

Area of Science:

• Polymer Science
• Materials Science
• Food Science

Background:

• Additive migration from polymers into food is a concern.
• Understanding diffusion kinetics is crucial for food safety and packaging.
• Existing models may not cover the full temperature range relevant to polymer processing and use.

Purpose of the Study:

• To develop a semi-empirical model for additive diffusion in polymers.
• To estimate apparent diffusion coefficients of additives in polyolefins.
• To assess the model's performance across a range of temperatures.

Main Methods:

• Development of a semi-empirical diffusion model.
• Application of the model to polyolefin polymers and fatty food simulants.
• Experimental validation across temperatures between glass transition and melting points.

Main Results:

• The model successfully estimates apparent diffusion coefficients for additive migration.
• The model's performance was evaluated for several additive/polyolefin systems.
• The study identified the model's validity and limitations.

Conclusions:

• A novel semi-empirical model provides a tool for predicting additive diffusion in polyolefins.
• The model is applicable for temperatures between the polymer's glass transition and melting points.
• Further studies are needed to fully define the model's limitations.