Abstract
Swift Heavy Ion (SHI) irradiation induces chemical and structural changes in polymers by evolving various gases and gaseous fragments. The evolution of gases as a result of chain scissoring and bond breaking leads to cross-linking and cluster formation. Study of the evolved gases helps in understanding the various chemical and structural changes occurring within the polymer under the effect of SHI irradiation. In the present work, Poly (o-toluidine) (PoT), a derivative of polyaniline, is prepared by chemical oxidation polymerization and is blended with polyvinylchloride (PVC) to achieve self supported films. These PoT-PVC blend films were irradiated by 60 MeV Si 5+ ions at different fluences and evolved gases were monitored on-line by Residual Gas Analyzer (RGA). Pre and post irradiation FTIR, UV-Visible absorption and XRD studies have been carried out on these films to observe the changes in chemical/structural and optical properties. An effort has been made to correlate the evolved gases and structural properties after irradiation.Copyright © 2011 VBRI press.
Highlights
Conducting polymers are an important class of organic polymers, which have many applications in optical, electronic, optoelectronic and sensory devices [1,2,3]
Irradiation of polymers plays an important role in modifying the various properties of the polymers [6,7,8]. These modifications in the macro-properties like structural, electrical, optical and thermal properties can be traced to transformations in the micro-level through cross-linking, chain scissoring, bond breaking and cluster formation due to the energy deposited by Swift Heavy Ion (SHI) beam [911]
The drastic changes in the Fourier transform infrared spectroscopy (FTIR) vibration peaks after irradiation are due to the chain scissoring and bond breaking in the polymer chains
Summary
Conducting polymers are an important class of organic polymers, which have many applications in optical, electronic, optoelectronic and sensory devices [1,2,3]. The new bond formation and change in crystallinity may lead to a decrease in conductivity and optical band gap in these blends after irradiation [13]. Online Residual Gas Analysis (RGA), which is basically a quadrupole mass analyzer, studies have been carried out on PoT-PVC blends to observe various gases evolved during irradiation.
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