Pre- and Post-Plasma Treatments of Polyethylene Glycol Polymerization on Polymer Surface for Immobilization of L-cysteine

Abstract

The effect of surface-wave plasma pre- and post-treatment on immobilization of L-cysteine molecules onto molecules grafted polyurethane (PU) surface was studied using surface-wave plasma treatment. The polyethylene glycol (PEG) molecules are grafted onto PU surface by means of both pre-treatment and post-treatment of Ar plasma, which behaves to activate PU surface and crosslink PEG molecules to substrate. The XPS results showed the concentration of OH group making a covalent bond increased by the Ar plasma treatment and an amount of immobilized L-cysteine was almost linearly related to PEG molecules grafted onto PU surface.