4 May 1993 Behavior of different PMMA qualities under CO2 laser irradiation
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Proceedings Volume 1810, 9th International Symposium on Gas Flow and Chemical Lasers; (1993) https://doi.org/10.1117/12.144563
Event: Ninth International Symposium on Gas Flow and Chemical Lasers, 1992, Heraklion, Greece
Abstract
The destruction process of PMMA under high power IR laser irradiation is a boiling process. In cast PMMA, bubbles remaining trapped at the end of the irradiation give a mat aspect to the burn pattern; on extruded PMMA this latter remains clear. This difference of behavior results from the wide difference of viscosity of these two qualities: the cast one is reticulated and its viscosity at the vicinity of vaporization temperature is still too high to be measured, whereas the extruded PMMA is rather fluid at high temperature. High speed video pictures show that a boiling process occurs for the two materials; however, at the end of the irradiation, the fast cooling of a high viscosity material traps the residual bubbles whereas the bubbles formed in the fluid extruded boiling PMMA can escape and the surface appears free of bubbles.
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Rene C. Joeckle, Rene C. Joeckle, Bernard Gautier, Bernard Gautier, Fabrice Lacroix, Fabrice Lacroix, Stephane Clemens, Stephane Clemens, Lam Thanh My, Lam Thanh My, } "Behavior of different PMMA qualities under CO2 laser irradiation", Proc. SPIE 1810, 9th International Symposium on Gas Flow and Chemical Lasers, (4 May 1993); doi: 10.1117/12.144563; https://doi.org/10.1117/12.144563
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