Variation of the mechanical properties of pulsed laser deposited PMMA films during annealing
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The structural and mechanical properties of polymethyl methacrylate (PMMA) thin films produced by pulsed laser deposition in ultra-high vacuum were investigated by infrared spectroscopy, electron microscopy, size-exclusion chromatography and microhardness measurements. After preparation, the film hardness and elastic modulus are found to be increased. This is caused by a reduced chain length of the polymer film to values of 5800 g/mol and by cross links of an amount of about 20% of the polymer, while the chemical structure of the deposited films is comparable to the target material. During annealing, relaxation processes lead to a reduction of the film hardness, without changing the cross-linked part in the samples.
KeywordsMechanical Property Elastic Modulus Pulse Laser Chain Length Infrared Spectroscopy
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- 2.D.B. Chrisey, G.K. Hubler: Pulsed Laser Deposition of Thin Films (Wiley, New York 1994)Google Scholar