Martin wrote:Sergio wrote:I do not see in the "traditional" polymerization method, the chain reaction is a triggered mechanism that will not stop in vinyl acrylate systems until termination, on other side in cationic ring open mechanism (epoxies), due the heat sensitivity, the total polymerization can be delayed at some extent that we can talk in latent image formation here.
Yes. In some cases the post-processing (heat, UV exposure, liquid processing) substantially enhances DE. So the "latent image" may simply be a weak image.
By the way, isn't that equally the case for dichromated systems?
I do not agree, the DCG mechanism, simply a crosslinked molecular effect is all done with the actining radiation, the firmly crosslinked region is all there, what the phase shift enhancement mechanism, isopropyl treatment, do is fill with voids the soft region, it can be done with (Polaroid material) polymers.
So the latent image is not simple with polymers, the key is with the photoinitiator mechanism coupled with some thermal one etc. In DCG, what would be interesting is enhance the molecular crosslinking with with a more SOFT gelatin; aiming the DC react more with gelatin groups?