I believe (but this is speculation; my knowledge is for glass-based optics) that AR coatings, even with polymer lenses, are thin films of metal oxides. For glass-based optics, they are deposited by evaporation, which is a high temperature process. For plastic lenses, it is likely a chemical vapor deposition process. There have been many publications (but I don't think anything commercial) about nanostructured antireflective coatings (AR) that do not depend on metal oxides.
If you believe Wikipedia, CR39 is "allyl diglycol carbonate" and not acrylic monomer. Based on the wikipedia article, the polymer chain of CR39 is a carbonate-based polymer, although the structure of the repeating units are straight chain (well, allyl) hydrocarbon rather than aromatic hydrocarbon. Both plastics (CR39 and polycarbonates) have naturally high absorption in the UV range, unlike acrylic resins ("plexiglas", "lucite", etc.). This actually leads to an interesting question: Do CA finishes protect the pen (or other similar item) from UV damage? Acrylic ("plexiglas") does transmit UV better than polycarbonates ("lexan" and similar)
Sorry to geek-out. I've been reading technical proposals at work, and need to write a number of recommendations on these proposals (which are (i) putting me to sleep, and (ii) interfering with my turning wood) by Thurs. 12/21.
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