Optimum heat treatment conditions for PAN-based oxidized electrospun nonwovens

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Optimum heat treatment conditions for PAN-based oxidized electrospun nonwovens

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PAN-based electrospun nonwovens have gained significant attention in various industrial applications due to their excellent mechanical properties and thermal stability. To achieve optimal performance, heat treatment plays a crucial role in the oxidation process of these materials.

The oxidation of PAN-based nonwovens typically involves a carefully controlled thermal stabilization step. This process converts the linear polymer chains into a ladder-like structure, enhancing their thermal resistance and mechanical strength. The key parameters that need optimization include temperature ramp rate, maximum treatment temperature, and dwell time.

For most applications, the heat treatment should begin with a gradual temperature increase to prevent structural damage. The oxidation process is usually carried out in an oxygen-containing atmosphere between 200-300°C. Maintaining precise temperature control during this phase is critical, as it affects the degree of cyclization and cross-linking in the polymer structure.

The duration of heat treatment significantly impacts the final material properties. Shorter treatment times may result in incomplete oxidation, while excessive durations can lead to excessive weight loss and structural degradation. Finding the right balance between these factors is essential for producing nonwovens with optimal mechanical strength and thermal stability.