Aiming an easy process for a surface treatment, cellophane was plasma treated at 12.75kV, 60Hz in ethylene at atmospheric pressure. Contact angles with ethylene glycol, 1-bromonaphthalene and diiodomethane were measured, and the surface-free energy of solid surfaces was calculated. Infrared spectra and X-ray photoelectron spectra were taken for the surfaces. A surface-free energy of treated cellophane decreased as compared with that of untreated one, and was close to that of a commercial polyethylene film. The intensities of infrared absorption bands assigned to cellulose were decreased by the treatment. New absorption bands assigned to methylene groups appeared at around 1380cm-1. The peak intensity due to O1S in XPS spectra of the plasma treated cellophane decreased with an increase in the plasma treatment time. Oxygen containing functional groups decreased on the surface of the treated cellophane. Judging from surface-free energy. IR and XPS spectra, the treated cellophane surface must be covered with (CH2)n units of the deposited polyethylene.

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Terpolymers composed of ethyl acrylate (EA), methoxypolyethyleneglycol methacrylate (MPEGMA) and polydimethylsiloxane methacrylate (PDMSMA) were synthesized by the radical polymerization technique. The high molecular mobilities for these terpolymers were shown by dynamic contact angle and adhesion tension measurement. Three properties of pressure sensitive adhesive, including 180-degree peel strength, probe tack and holding power, for these terpolymers were good. The blood compatibility of these terpolymers was also investigated. The thrombi were not observed on the terpolymer surface after immersion in blood, while many blood clusters were observed on a polystyrene (PSt) surface. After immersion in platelet-rich plasma (PRP), a few adhered platelets were observed on terpolymer surface but they did not deform and maintained their spherical form, while many platelets were observed on polystyrene. It was found that they had a significant blood compatibility.

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