22 August 2014 Effect of CO2 laser micromachining on physicochemical properties of poly(L-lactide)
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Proceedings Volume 9286, Second International Conference on Applications of Optics and Photonics; 92860Z (2014) https://doi.org/10.1117/12.2063684
Event: Second International Conference on Applications of Optics and Photonics, 2014, Aveiro, Portugal
Abstract
In this paper, we present some examples of micromachining of poly(L-lactide) with a CO2 laser and an analysis of changes in material properties in the heat affected HAZ induced by the fluence well above the ablation threshold. The complexity of the processes of decomposition implies the need for simultaneous use of many selective analytical techniques which complement each other to give a full image of the changes. Introduced changes were characterized using Differential Scanning Calorimetry (DSC), Gel Permeation Chromatography (GPC), X-ray Photoelectron Spectroscopy (XPS) and Attenuated Total Reflectance Fourier Transform Infrared spectroscopy (ATR-FTIR). It turns out that CO2 laser processing of poly(L-lactide) mainly induces surface changes. However, oxidation of the surface was not observed. We recorded a bimodal distribution and some reduction in the molecular weight. Infrared spectroscopy in turn revealed the existence of absorption bands, characteristic for the vinyl groups (RCH=CH2). The appearance of these bands indicates that the decomposition of the polymer occurred, among others, by means of the cis-elimination reaction.
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Arkadiusz J. Antończak, Arkadiusz J. Antończak, Bogusz Stępak, Bogusz Stępak, Konrad Szustakiewicz, Konrad Szustakiewicz, Michał Wójcik, Michał Wójcik, Paweł E. Kozioł, Paweł E. Kozioł, Łukasz Łazarek, Łukasz Łazarek, Krzysztof M. Abramski, Krzysztof M. Abramski, } "Effect of CO2 laser micromachining on physicochemical properties of poly(L-lactide)", Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 92860Z (22 August 2014); doi: 10.1117/12.2063684; https://doi.org/10.1117/12.2063684
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