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Identification of Hydrophilic Group Formation on Polymer Surface During Ar+ Ion Irradiation in O2 Environment

Published online by Cambridge University Press:  03 September 2012

Jun-Sik Cho ,
Won-Kook Choi ,
Sung-Ryong Kim ,
Hyung-Jin Jung  and
Seok-Keun Koh
Jun-Sik Cho
Affiliation:
Ceramic Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, 130-650, Korea
Won-Kook Choi
Affiliation:
Ceramic Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, 130-650, Korea
Sung-Ryong Kim
Affiliation:
Sam Yang R&D Center, 63-2 Hwaam-Dong, Yusung-Gu, Teajon, Korea
Hyung-Jin Jung
Affiliation:
Ceramic Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, 130-650, Korea
Seok-Keun Koh
Affiliation:
Ceramic Division, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, 130-650, Korea
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Abstract

Ar+ ion irradiation on low density polyethylene (LDPE), and polystyrene (PS) was performed in an O2 environment in order to improve wettability of polymers to water and to identify the formation of hydrophilic groups originated from chemical reactions on the surface of polymers. Doses of a broad Ar+ ion beam of 1 keV energy were changed from 5 × 1015 to 1 × 1017 /cm2 and the rate of the oxygen gas flowing near the sample surface was varied from 0 to 7 mi/min. The contact angle of polymers was not reduced much by Ar+ ion irradiation without oxygen gas. However, it dropped largely to a minimum of 35 ° and 26 ° for At+ ion irradiation in the presence of flowing oxygen gas on LDPE and PS, respectively. From x-ray photoelectron spectroscopy analysis, it was observed that hydrophilic groups were formed on the surface of polymers through an ion-assisted chemical reaction between the ion-induced unstable chains and oxygen. The newly formed hydrophilic group was identified as -(C=O)- bond and -(C=O)-O- bond. The contact angle of polymer was greatly dependent on the hydrophilic group formed on the surface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 438: Symposium A – Materials Modificaton and Synthesis by Ion Beam… , 1996 , 517
Copyright
Copyright © Materials Research Society 1997

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