Surface Activation of Medical Plastics

Atmospheric Plasma Surface Modification of Medical Plastics
By Peter C. Guschl, Ph.D.
Surfx Technologies LLC

Most plastics are hydrophobic  and have low surface energy (~30-40 dyne/cm). By increasing the hydrophilic character and the surface energy of the plastic, its adhesive bond strength can be  improved dramatically. Acetal  copolymer (AC), polycarbonate (PC),  polyethylene terephthalate (PET), poly  (tetrafluoroethylene) (PTFE), poly (etheretherketone) (PEEK), poly (dimethylsiloxane) (PDMS silicone) possess attractive physical properties that are desirable to the medical device industry.

Acetal copolymer (e.g. Celcon®) is used in drug delivery systems such as dry powder inhalers, nebulizers, prefilled syringes, insulin injection pens, needleless syringes and metered dose inhalers.

Polycarbonate materials based on bisphenol A (for example, Diflon®, Macrolon®, Lexan®, and so on) are used for lenses, cell-culture containers, blood oxygenators and filters, surgical instruments and IV connectors.

Polyethylene terephthalate (e.g. Ertalyte®, Eastar Copolyester MN100) is used for vascular grafts, implantable
sutures, surgical mesh, and components for heart valves.

By enabling medical plastics to bond well with other materials, more convenient and functional medicaldevices can be fabricated.

To learn more and to download the full report go to Surface Activation of Medical Plastics.