Polymer Surface Modification by Using Microwave Plasma Irradiation
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概要
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We studied the modification process of polystyrene (PS) samples by using plasma irradiation to achieve long lived hydrophilic surface. PS samples were treated using by electron cyclotron resonance plasma. The plasma irradiation process that we developed is consisted of two steps treatment. The first step is the pretreatment by only argon plasma irradiation, and the second step is the treatment by argon/oxygen plasma irradiation. The hydrophilicity of PS samples was evaluated by water contact angle and X-ray photoelectron spectroscopy (XPS). The water contact angle of PS samples decreased after plasma irradiation, and this result of the contact angle is indicating the obvious hydrophilic transformation of the plasma irradiated PS samples. Furthermore, this two steps process including pretreatment of argon plasma irradiation is effective to inhibit the contact angle increasing with time and keep the hydrophilicity of PS samples for long time. The pretreatment of argon plasma irradiation is considered to improve the reaction efficiency of oxygen radical at PS sample surface because the argon ion had the physical effect and increased the reactive site or surface area of PS surface. XPS analysis shows that the functional groups including oxygen are existing on PS sample surface after treated by plasma, and these groups were responsible for the change of hydrophilicity. XPS spectra of the plasma treated PS sample showed that the peak area assigned to O-C=O group was decreasing with time. The functional group as O-C=O is presumed to be the most important factor for the hydrophilicity of PS sample.