Mössbauer studies of iron doped poly(methyl methacrylate) before and after ion beam modification

D. R. S. Somayajulu, C. N. Murthy, D. K. Awasthi, N. V. Patel, M. Sarkar
2001 Bulletin of Materials Science  
High-energy MeV ions from accelerators are known to produce drastic modifications in polymers. The typical effects include chain scissions, crosslinks, molecular emission and double bond formation. Poly(methyl methacrylate) was doped with Fe(III) and irradiated with 95 MeV O 7+ ions. 57 Fe-Mössbauer studies were done on the doped samples before and after irradiation. Before irradiation, no Mössbauer absorption was observed. The irradiated samples showed a good Mössbauer absorption, which seems
more » ... o indicate that there is a significant interaction between the metal ion and the polymer matrix. Two possibilities exist at these doses (~ 22 × 10 12 ions/cm): Fe(III) ions may be bridging the various polymer segments through crosslinking or amorphization of the sample leading to Fe-C bonding. Studies of FTIR, conductivity and glass transition temperatures on these samples support these observations.
doi:10.1007/bf02708637 fatcat:gfshlbravrberavqlyatne2ame