Why does polymerisation of methycrylate and TPO or TPO-L not start?

Materials are methyl and butyl methycrylate and a photoinitiator (TPO or TPO-L). Light source is a UV Laser with 405nm. With intesities lower than 1mW polymerization needs about 2 hours. Speeding...

02 February 2019 3,825 5 View