Waterproof paper

Scientists have unveiled a new technique for making waterproof, self-cleaning paper.

The research is reported in the latest edition of the Royal Society of Chemistry journal Chemical Communications.

A team of polymer experts at the Royal Institute of Technology, Stockholm, used a technique called 'atom transfer radical polymerisation' to modify filter paper.

Two sets of compounds - one containing fluorine atoms - were grafted onto the onto the cellulose fibres of the paper - which made it hydrophobic or "water-fearing."

Water droplets then rolled off the surface of the paper, carrying dust and debris with them.

The research opens up a wide range of possibilities for new applications of cellulose and paper.

Dr Eva Malmström, who leads the team, said: "In future we may be able to pattern thin papers using this approach, which could eventually allow chemical sensors to be constructed by modifying paper."

The two stage grafting method used by the group has potential to be applied to alter other rough surfaces - with current efforts directed at biological materials and polymers.

Dr Malmström said some of these softer compounds, when grafted together, form solid materials.

She said: "This is a very versatile approach to making composite materials based on a very high percentage of renewable material."

Future challenges for the team include making the technique more environmentally friendly.

Dr Malmström said: "We have used a significant amount of fluorine - which is not very attractive. We want to find ways to accomplish the same result without fluorine."

with thanks to Clare Boothby for the original article