Plasma surface treatments of melt-extruded sheets of poly(L-lactic acid)

Autor:	Kazuo Nakayama, Toshihiro Hirotsu, André Mas, Toshiyuki Tsujisaka, François Schué
Rok vydání:	2002
Předmět:	Atmospheric pressure discharge Materials science Polymers and Plastics chemistry.chemical_element General Chemistry Plasma Biodegradation Surface energy Contact angle Chemical engineering chemistry Polymer chemistry Materials Chemistry Polar Surface modification Helium
Zdroj:	Polymer Engineering & Science. 42:299-306
ISSN:	1548-2634 0032-3888
DOI:	10.1002/pen.10949
Popis:	Poly(L-lactic acid) sheets, prepared by melt extrusion, were treated with O 2 -, He-, and N 2 -plasmas generated in radio frequency (RF) at 13.56 MHz. Atmospheric pressure discharge at 20 kHz in helium was also applied to the modification of the sheets. The surface of the PLLA sheets was etched to form the characteristic morphology, and the patterns were different depending on the type of plasma. Polar groups composed of -COOH and -OH were incorporated by plasma treatment, and the surface became wettable. Surface modification became effective after a short treatment period, e.g., 30 seconds. Receding contact angles (θ r ) changed remarkably, and the surface properties were closely related to the increase in the surface energy of the polar contribution (γ s p ). Biodegradation of the poly(L-lactic acid) sheets was not enhanced practically, even though the surface became hydrophilic after plasma treatment.
Databáze:	OpenAIRE
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