In china a team of researchers have introduced a triple layer coating that makes cotton waterproof and fire resistant as well as self cleaning.The researchers Shanshan Chen , Xiang Li, Yang Li and Junqi Sun from Jilin University found a way to extend the life of fire retardants and hit on an idea to formed water resistant materials.
They dipped a strip of cotton into different chemicals such as a binding agent "polyethylenimine" to stuck the chemicals into the strip of cotton, then dipped into a fire retardants known as ammonium polyphosphate and at the end they dipped it into ethanol and silsesquioxane solution which work as a seal against water.
Then they exposed both strips, treated as well as untreated, to flame.The treated cotton released a gas that cut off the oxygen supply and blasts out fires in a few seconds.While the other strip burns up quickly.The first layer allows waterproofing that remain on cotton strip after 1000 times rubbing.The second layer of hydrophobic molecules act as a self-healing, fills the gaps where the first layer is damaged.
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