Introduction

Drying polyamides plays a crucial role in ensuring their stability and durability. These materials are widely used in the automotive, sports, and household industries due to their heat resistance, mechanical strength, and chemical resilience. However, their high hygroscopicity-the ability to absorb moisture from the environment-makes them susceptible to changes in mechanical properties.

Moisture in polyamides can lead to two main types of changes:

• Plasticization: reduces material stiffness and strength, increases ductility.
• Hydrolysis: breaks down polymer chains, making the material brittle and shortening its lifespan.

Proper drying eliminates moisture, preventing degradation of polyamide properties. Controlling drying temperature, duration, and methods helps maintain their performance characteristics.

This section covers the key aspects:

1. Why polyamides are hygroscopic and how this affects their properties.
2. Moisture content measurement methods and their accuracy.
3. Recommendations on choosing drying temperature, time, and equipment.
4. The role of additives such as glass fiber and stabilizers in enhancing moisture resistance.
5. Experimental examples demonstrating moisture effects on mechanical properties.
6. Drying errors: how to avoid overheating and associated damage.

Each of these topics is discussed in dedicated chapters, providing a comprehensive overview of the problem and its solutions.