Luquafleece2

By Andrew H. Dent

Manufacturer: BASF (Germany)

This fleece-like material is completely air permeable in dry conditions and able to absorb up to 400 times its weight in water. It comprises a polyester nonwoven material, coated with granules of sodium acrylate (often used in diapers) that are permanently bonded to the nonwoven fibers. The superabsorber is basically a loose bundle of polymer molecules that absorbs water like a sponge, but which also has a high ion charge, drawing in water to the polymer network through osmotic pressure, making it much more effective than regular absorbers. (However, it only works with fresh water, as salt water already has an ion charge that stops its effectiveness as an absorber.)

The fleece is constrained between two outer layers, so it can expand in only one orientation and thus quickly bulks up to form a waterproof barrier. The nonwoven material dries fast by evaporation once out of wet conditions, regaining its air permeable properties. The process can occur a limitless number of times and the material is being launched in the sole of a children’s outdoor boot. Other potential applications include sealing vents in outdoor apparel, and tents.

Andrew H. Dent is vice-president of library and materials research at Material ConneXion, a leading global platform for material innovations and solutions.