An inexpensive method to make water repellant polymer

Dutch researchers have discovered a quick and inexpensive method to make polymers water repellant. The process uses a special high-speed laser, called 'fematosecond laser', which shot short bursts of high-energy light at one-millionth of a billionth of a second onto a steel surface. At that high speed, the laser has very little time to melt the metal or produce craters.

With one burst, the fematosecond laser vaporizes a tiny spot about half the diameter of a human hair, and some billionth of a meter deep. By applying more pulses, one can create deeper holes and by careful arrangement of millions of laser bursts, it is possible to write the bumpy structure. During vaporization, tiny structures in the metal begin to grow. These substructures add a second roughness, which makes the surface super water repellent. This technique can easily be applied during injection moulding process. During process, while forcing molten polymer into the mould under high pressure, the molded product becomes water repellant.

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http://www.plastemart.com/upload/Literature/Waterrepellantpolymer.asp

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