Surface Wettability Controllable Polyimides Bearing Long-chain Alkyl Groups by UV Light Irradiation

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  • Tsuda Yusuke
    Department of Biochemistry & Applied Chemistry, Kurume National College of Technology

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The soluble polyimides were synthesized from the several types of diamine monomers having multiple long-chain alkyl groups, tetracarboxylic dianhydrides such as Cyclohexene-DA, 3,4’-ODPA (a-ODPA), DSDA, and DDE as a diamine co-monomer. The thin films of obtained polyimides were irradiated by UV light (λmax; 254 nm) , and the contact angles for the water decreased from near 100° (hydrophobicity) to near 20° (hydrophilicity) in proportion to irradiated UV light energy. From the result of contact angle measurements and the result of the ATR and XPS analysis, it is recognized that the hydrophobic long-chain alkyl groups on the polyimide surface decrease and the hydrophilic groups such as a carboxyl group and a hydroxyl group generate on their surface. Thus, the surface wettability of polyimides bearing long-chain alkyl groups can be controlled by UV light irradiation, and these methods are expected to be applied in the field of printed electronics.

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