Atmospheric oxygen-helium plasma surface modification of medical plastics

P. Guschl, R. Hicks, S. MacDavid
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引用次数: 2

Abstract

This study examines the effect of atmospheric pressure plasma treatment on the surface energy and adhesive bond strength of three medical polymers: acetal copolymer (AC), polycarbonate (PC) and polyethylene terephthalate (PET). Surface treatments were applied with a two-inch plasma beam source and reactive oxygen-helium (~1-3 vol% O2) plasma under 150 and 200 W RF power. Through contact angle measurements and surface energy calculations, the response of these polymers to the plasma was found to be unique. Surface activation was rapid, occurring within 5 to 10 seconds of exposure. The PC and PET surface energies approached ges 70 dyne/cm. The acetal copolymer initially jumped to 58 dyne/cm, then declined with further plasma exposure, possibly due to etching or chain scission of the polymer. Langmuir-Hinshelwood reaction kinetics provided an excellent fit to the surface energy versus time data. Subsequent adhesion tests with epoxy, urethane and acrylate glues revealed large increases in adhesive bond strength for the AC (+50-300%), PC (+20-60%) and PET (+100-350%) following exposure times of 0.25 to 40 s under the plasma beam. At the meeting, I will describe the mechanism for activation of the polymer chains with the atmospheric pressure oxygen plasma.
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医用塑料的常压氧-氦等离子体表面改性
本研究考察了常压等离子体处理对三种医用聚合物:缩醛共聚物(AC)、聚碳酸酯(PC)和聚对苯二甲酸乙二醇酯(PET)的表面能和粘接强度的影响。在150和200 W的射频功率下,使用两英寸等离子体束源和活性氧-氦(~1-3 vol% O2)等离子体进行表面处理。通过接触角测量和表面能计算,发现这些聚合物对等离子体的响应是独特的。表面激活迅速,在5到10秒内发生。PC和PET表面能接近70达因/cm。缩醛共聚物最初跃升至58达因/厘米,然后随着进一步的等离子暴露而下降,可能是由于聚合物的蚀刻或链断裂。Langmuir-Hinshelwood反应动力学与表面能-时间数据非常吻合。随后用环氧树脂、聚氨酯和丙烯酸酯胶进行的粘合测试显示,在等离子束下暴露0.25至40秒后,AC(+50-300%)、PC(+20-60%)和PET(+100-350%)的粘合强度大幅增加。在会议上,我将描述常压氧等离子体活化聚合物链的机理。
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