Systems including varactor devices are provided. A representative compound is -N-methyl-5–4-penten-2-amine. The present invention further provides a process for preparing the chemically-modified support of the invention. Suitable components include chamber walls, chamber liners, baffle rings, gas distribution plates, plasma confinement rings, and liner supports. The invention further relates to the use of the novel proteins in the treatment of TNF- related disorders, such as rheumatoid arthritis. This polymer compound is characterized in that the functional group is directly bonded to a saturated carbon atom in the repeating unit or bonded to the repeating unit via X is an \u2014RJ\u2014X\u2014 group \u2014O, S\u2550O, SiR8R9, NR10, BR11, PR12 or PR13.