I'm working on the improvment of thiol-ene photopolymerization system. The photopolymerization of the system in presence of TPO photoinitiator is very effecient and give a very stiff and hard polymer upon exposure to UV. However, with the addition of ZrO2 there is a clear change in the mechanical properties (the saple is getting more ductile). What is the reason and How can I avoid this ?
Thanks in advance