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Proceedings Paper

Excimer laser-induced incubation of poly(L-lactide)
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Paper Abstract

The irradiation of polylactide by KrF excimer laser with subthreshold fluence results in modification of its properties via photochemical reactions. A common approach is to modify chemical composition of polymer surface by UV irradiation, for example, in order to improve their wetting properties. In this paper, authors present a possibility of bulk modification of poly(L-lactide) which is related to photofragmentation and creation of new terminal groups. The irradiation results in decrease of molecular weight and increase of polydispersity. The appearance of new terminal groups is responsible for enhancement of absorption in UV-C range. The intensity of chemical composition changes introduced by UV irradiation can be precisely dosed thanks to a pulse character of laser source. Modifications can be controlled during the process by the analysis of energy transmitted through a polymer sheet. The distribution of absorption coefficient changes along with the depth of irradiated polymer and its correlation with polydispersity was discussed. Presented technique can be used for selective and controllable modification of hydrolytic degradation time of biodegradable polyesters utilized in biomedical applications.

Paper Details

Date Published: 22 August 2014
PDF: 10 pages
Proc. SPIE 9286, Second International Conference on Applications of Optics and Photonics, 928611 (22 August 2014); doi: 10.1117/12.2063579
Show Author Affiliations
Bogusz D Stępak, Wroclaw Univ. of Technology (Poland)
Arkadiusz J. Antończak, Wroclaw Univ. of Technology (Poland)
Konrad Szustakiewicz, Wroclaw Univ. of Technology (Poland)
Paweł E. Kozioł, Wroclaw Univ. of Technology (Poland)
Michał R. Wójcik, Wroclaw Univ. of Technology (Poland)
Lukasz Lazarek, Wroclaw Univ. of Technology (Poland)
Krzysztof M. Abramski, Wroclaw Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 9286:
Second International Conference on Applications of Optics and Photonics
Manuel Filipe P. C. Martins Costa; Rogério Nunes Nogueira, Editor(s)

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