caa a22 4500 463215605 CHVBK 20180405153155.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s00339-007-3923-y doi (NATIONALLICENCE)springer-10.1007/s00339-007-3923-y Effect of barium chloride doping on PVA microstructure: positron annihilation study [Elektronische Daten] [R.F. Bhajantri, V. Ravindrachary, A. Harisha, C. Ranganathaiah, G.N. Kumaraswamy] Microstructural studies on BaCl2 doped polyvinyl alcohol (PVA) polymer films were carried out using density, PAL and dielectric measurements at room temperature. The positron annihilation studies on these samples shows considerable effect on the PVA microstructure due to doping and is understood by invoking the chemical reaction between Ba2+ ions of BaCl2 with OH groups of PVA via intra/inter molecular hydrogen bonding, which forms the complex. This complex formation modifies the free volume content in the amorphous fraction, and results in an enhancement of the polymer crystallinity. At higher dopant concentrations, the number of such complexes increases, and ends up with the formation of dopant aggregates or agglomerates leading to certain phase separation into a polymer-rich phase and a dopant-rich phase. These phase separations are thought to be due to the existence of two or more crystalline phases within the polymer matrix. The XRD study also supports this enhancement of PVA crystallinity due to doping. The electrical studies on the doped PVA reflects that the complex formation due to doping affects the microstructure and hence the dielectric properties including the dc and ac conductivities of the polymer. All of these observed results were analyzed and understood based on the microstructural modification of PVA as a function of dopant concentrations. Springer-Verlag, 2007 Bhajantri R.F. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut Ravindrachary V. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut Harisha A. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut Ranganathaiah C. Department of Physics, University of Mysore, 570006, Manasagangotri, India aut Kumaraswamy G.N. Department of Physics, University of Mysore, 570006, Manasagangotri, India aut Applied Physics A Springer-Verlag 87/4(2007-06-01), 797-805 0947-8396 87:4<797 2007 87 339 https://doi.org/10.1007/s00339-007-3923-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3923-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bhajantri R.F. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut NATIONALLICENCE 700 1- Ravindrachary V. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut NATIONALLICENCE 700 1- Harisha A. Department of Physics, Mangalore University, 574199, Mangalagangotri, India aut NATIONALLICENCE 700 1- Ranganathaiah C. Department of Physics, University of Mysore, 570006, Manasagangotri, India aut NATIONALLICENCE 700 1- Kumaraswamy G.N. Department of Physics, University of Mysore, 570006, Manasagangotri, India aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 87/4(2007-06-01), 797-805 0947-8396 87:4<797 2007 87 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer