Is teflon a dimer? I know that it is an addition polymer, but I don't know if that classifies it as a dimer.

Question

No. A dimer is two monomers hooked together. Teflon is a polymer;i.e., many monomers hooked together. I tried to find the molar mass of teflon was was unable to do so. I will post it here if I can find it.

According to this web site the molar mass can exceed 30,000,000. So there are literally thousands of monomer units hooked together.
http://inventors.about.com/library/inventors/blteflon.htm