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Sodium polyacrylate absorbing water

K007/2036

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NILERED / SCIENCE PHOTO LIBRARY NILERED / SCIENCE PHOTO LIBRARY

Caption

Sodium polyacrylate absorbing water. Water being added to a small quantity of sodium polyacrylate in a glass, causing it to expand many times in volume. Sodium polyacrylate is a polymer. It is a sodium salt of polyacrylic acid, and expands as it absorbs hundreds of times its own weight in water due to osmosis. The polymer network acts like a semi-permeable membrane, with water flowing into the ion-rich polymer due to osmotic pressure. Despite the volume of water added here, the resulting 'snow' is virtually dry as the water has been absorbed. Sodium polyacrylate is also referred to as 'instant snow' and 'waterlock'. Applications for this polymer include uses in detergents, thickening agents, artificial snow, and absorbing pads in products such as nappies.

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  • Duration: 00:00:30.21
  • Audio: No
  • Interlaced: No
  • Capture Format: Unknown
  • Codec: H.264

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