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

Abstract

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 to 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.

Direct Production of a Novel Iron-Based Nanocomposite from the Laser Pyrolysis ofFe(CO)5/MMAMixtures: Structural and Sen

“…Recently, ferrocene-based [24] and Ziegler-Natta type [25] catalyst systems were used to greatly improve MMA polymerization. The interaction of nanoscale iron and (un)degraded PMMA matrix was also confirmed by Mossbauer and IR spectra [26].…”

“…On the MF04 spectrum, these peaks are relatively shifted from the above-mentioned values possibly expressing polymer-metal oxide surface interaction (see also below). The appearance of Fe-C bonds responsible for these IR peak shifts has been supposed [26]. It is worth to mention that in the 2800-3000 cm −1 region, there could be a superposition with the characteristic vibrations of turbostratic/amorphous carbon.…”

Low-Temperature TSDC Studies of Molecular Dynamics in Pristine and O7+Ion–Modified Liquid Crystalline Polyurethane

“…[6] Insulating liquid crystalline polymers can be modified using ion irradiation for specific applications, like nonlinear optics (NLO). [7] Swift heavy ion irradiation is well known for modification of physical, structural, electrical, optical, mechanical, and thermal properties in different polymeric materials (made up of long-chain molecules, like LC molecules). [8][9][10][11] Moreover, devices made up of liquid crystalline materials are often used in high-radiation environments such as nuclear installation centers and space applications.…”