I've written in the past of not wanting to work with urushiol as a monomer, despite it be biobased and producing some incredibly beautiful lacquers. It's just that the whole idea of working with the active allergen from poison ivy gets my skin crawling (pun intended).
I'm adding another monomer to the list, or more correctly, a polymer made from such monomers. Angewandte Chemie has a short review in it's latest issue entitled "Growing Cantenated Nitrogen Atom Chains".
[*] My operation definition of a polymer is a chain long enough that the addition of one more monomer does not change the properties of the material. This is truly operationally defined as depending on what properties you are examining, that length may vary.