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Surface modification of poly(lactic acid) by UV/Ozone irradiation

Surface modification of poly(lactic acid) by UV/Ozone irradiation Abstract Hydrophobic poly(lactic acid), PLA, was modified to give hydrophilicity and dyeability to cationic dyes via UV/O3 irradiation. The UV irradiation treatment caused ester linkage of PLA surface to break down resulting in reduced molecular weight and generation of new photooxidized products as indicated in subtracted ATR spectra and ESCA analysis. It was found that water contact angle decreased from 61 ° to 39 ° and surface energy slightly increased with increasing UV energy, which was attributed to significant contribution of polar component rather than nonpolar component resulting from the surface photooxidation of PLA. Also the surface treatment increased dyeability of PLA to C.I. Basic Blue 41 in terms of both K/S and %E. The increased dyeability may be due to photochemically introduced anionic and dipolar dyeing sites which electrostatically interact with the cationic dye as ascertained by the decreased zeta potential and its pH dependence of the modified PLA. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fibers and Polymers Springer Journals

Surface modification of poly(lactic acid) by UV/Ozone irradiation

Fibers and Polymers , Volume 9 (6): 5 – Dec 1, 2008

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References (13)

Publisher
Springer Journals
Copyright
2008 The Korean Fiber Society and Springer-Verlag Berlin Heidelberg GmbH
ISSN
1229-9197
eISSN
1875-0052
DOI
10.1007/s12221-008-0106-1
Publisher site
See Article on Publisher Site

Abstract

Abstract Hydrophobic poly(lactic acid), PLA, was modified to give hydrophilicity and dyeability to cationic dyes via UV/O3 irradiation. The UV irradiation treatment caused ester linkage of PLA surface to break down resulting in reduced molecular weight and generation of new photooxidized products as indicated in subtracted ATR spectra and ESCA analysis. It was found that water contact angle decreased from 61 ° to 39 ° and surface energy slightly increased with increasing UV energy, which was attributed to significant contribution of polar component rather than nonpolar component resulting from the surface photooxidation of PLA. Also the surface treatment increased dyeability of PLA to C.I. Basic Blue 41 in terms of both K/S and %E. The increased dyeability may be due to photochemically introduced anionic and dipolar dyeing sites which electrostatically interact with the cationic dye as ascertained by the decreased zeta potential and its pH dependence of the modified PLA.

Journal

Fibers and PolymersSpringer Journals

Published: Dec 1, 2008

Keywords: Polymer Sciences

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