Yes, silk is highly absorbent. It possesses a high hygroscopicity, meaning it can absorb a significant amount of water. This makes it superior in absorbency to many other fibers like cotton, cellulose acetate, polyester, and nylon.
Silk's Absorption Capacity
Silk can absorb up to 30% of its weight in moisture without feeling damp to the touch. This excellent absorbency is why silk is often chosen for clothing and bedding, as it effectively wicks away perspiration. However, while absorbent, prolonged exposure to water can weaken silk fibers, so care should be taken during washing.
Contrasting Views on Silk's Hydrophobicity
While most sources highlight silk's absorbency, some studies mention its hydrophobic properties in specific contexts. One study indicated that silk acts as a hydrophobic barrier to water droplets, suggesting that the water absorption properties are dependent on the specific form and treatment of the silk. This might explain the seemingly contradictory information available online. This contrast highlights that the absorbency depends on the form (e.g., fabric, fiber, powder) and treatment (e.g., surface modification) of silk.
Practical Implications
- Clothing: Silk's absorbency makes it comfortable for clothing, especially in warm weather, as it draws perspiration away from the skin.
- Bedding: Silk pillowcases and bedding are popular due to their moisture-wicking properties, leading to a more comfortable sleep.
- Industrial Applications: While not widely known, modified silk powder finds applications in oil-water separation due to its selective oil absorption capacity.
