I need to know, whether a polymer as in PMMA can absorb UV radiation and if so what is the electronic transition going on in it when its doped with Metal oxides, can it cut-off the short UV wavelength?
Its is well known, due to chain scission - polymer would degrade under such high radiation but with some doping, it could withstand.
if so, what could be mechanism electronically going on inside the polymer matrix as the UV photon radiation energy getting absorbed by PMMA/ Metal oxides while absorbing energy could excite the electrons to jump to higher energy level but whether the electron after staying in Upper energy level reverting back to it original position or it is somewhere trapped in matrix?
How? Need to know the mechanism running behind?
Please help.
Thank You!
UV absorption by polymer?. Available from: https://www.researchgate.net/post/UV_absorption_by_polymer [accessed Apr 23, 2015].
hi,
I think that PMMA can undergo a Norrish I process inducing a scission of CH3O-CO bond at low wavelength.
regards
Hi, Emmanuel Richaud.. - Thank You!
have read some books on it too, it states that energy getting transformed in form of heat which makes the polymer degrade but while its doped with metal oxides, the polymer stands intact.. hence, either the energy getting absorbed by the metal oxides or by the polymer and if the dopant's getting it absorbed, what is going on there as electronically between the Energy band ..
are you sure that the effect of metal oxide particle is not induced by any "reflexion" effect (a decrease of light trnamisttance in the polymer)
hope my sentence is clear
regards
kind of sure-- as metal oxides nanoparticles tend to absorb the UV radiation.. but - wat thing is going on while its reinforced with polymer matrices, could not understand..-- light ray transmission is almost neglible throught he polymer if its integrated with well dispersed metal oxide nanoparticles --
Thank You!
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