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Investigation of pulsed laser effects on the structure of poly methyl methacrylate polymer

Davoud Dorranian, Shima Zahedi

In this work the second harmonic ofNd:YAG laser with 6 ns pulse width and 10 Hz repetition rate was used to modify the surface of red BS dye doped polymethylmethacrylate (PMMA) films. Sampleswere ablated with 30, 50, and 100 pulses of laser beam. Results show noticeable changes in Fourier transform infrared spectrum of samples, confirms that treatment has made noticeable changes in functional groups of samples surface. According to AFMmicrographs there are significantmodification inmorphology of samples surface. Laser treatment in this range has increased the surface energy of samples. From different measured data it can be claimed that properties of the samples treated with 30 laser pulse is closer to the properties of pristine sample while properties of treated samples with 50 and 100 pulses are very similar to each other