Several groups have described synthesis of PTMA (4) using free radical polymerization of 2,2,6,6-tetramethylpiperidine methacrylate (2) with 2,2'-azobisiobutryonitrile (AIBN) as a radical initiator. The monomer was prepared via 2,2,6,6-tetramethyl-4-piperidinol (1) and methacryloyl chloride. The precursor neutral polymer (3) was oxidized to the stable radical polymer (4) by 3-chloroperoxybenzoic acid (mCPBA).Kurosaki, T.; Lee, K. W.; Okawara, M. J. Polym. Sci. A-1 Polym. Chem. 1972, 10 (11), 3295–3310. doi: 10.1002/pol.1972.170101116Nakahara, K.; Iwasa, S.; Satoh, M.; Morioka, Y.; Iriyama, J.; Suguro, M.; Hasegawa, E. Chemical Physics Letters 2002, 359 (5–6), 351–354. doi: 10.1016/S0009-2614(02)00705-4 Similar synthetic approaches have been proposed using 4-methacryloyloxy-N-hydroxy-2,2,6,6-tetramethylpiperidine as a monomer rather than 2,2,6,6- tetramethylpiperidine methacrylate.Kurosaki, T.; Takahashi, O.; Okawara, M. J. Polym. Sci. Polym. Chem. Ed. 1974, 12 (7), 1407–1420. doi: 10.1002/pol.1974.170120705
