TY - JOUR
T1 - Exploration of free volume behavior and ionic conductivity of PVA
T2 - x (x = 0, Y2O3, ZrO2, YSZ) ion-oxide conducting polymer ceramic composites
AU - Chavan, Chetan
AU - Bhajantri, Rajashekhar F.
AU - Cyriac, Vipin
AU - Ismayil, null
AU - Bulla, Soumya
AU - Ravikumar, H. B.
AU - Raghavendra, M.
AU - Sakthipandi, K.
N1 - Funding Information:
The author Chetan Chavan expresses his gratitude to the University Grants Commission (UGC), New Delhi, for providing UGC-JRF / SRF Fellowship (518772 / Dec 2015). Also, one of the authors, Soumya S Bulla, thanks to the Karnatak University for financial support in the form of University Research Studentship, including the Department of Science and Technology, Government of Karnataka, India, for the award of the KSTePS Research Fellowship (DST / KSTePS / Ph. D. Fellowship / PHY-04:2018–19). This work is also jointly supported by Davangere University, Karnataka, India. All profound gratitude goes to the experimental facilities provided by the USIC & SAIF (University Scientific Instrumentation centre & Sophisticated Analytical Instrument Facility), Karnatak University, Dharwad. The authors also acknowledge the Science and Engineering Research Board, Department of Science and Technology, Government of India, New Delhi, for the research project (SB/EMEQ-089/2013). The authors are grateful to UGC, New Delhi, for the SAP-CAS Phase-II program (F.530/9/CAS-II/2015(SAP-I) for financial assistance. The authors are also thankful to Karnataka State Higher Education Council, Government of Karnataka, for the RUSA1.0 grant (KSHEC/254/KUD/15–16/544) at K.U. Dharwad.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/8/15
Y1 - 2022/8/15
N2 - This article presents a comparative analysis of three distinct zirconia-inserted polyvinyl alcohol (PVA) polymer matrices. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and atomic force microscopy (AFM) were used for the study of structural, chemical composition (functional groups), and morphological properties. Changes in IR bands revealed the interaction of nanofillers with the PVA matrix. ZrO2 added sample shows the lowest degree of crystallinity with the least free volume compared to pristine PVA. Threadlike chains and scattershot crystal morphologies were seen in AFM images, and the PVA/ZrO2 has the lowest level of roughness (1.27 nm). Positron annihilation lifetime profile showed identical behavior for τ3, τ2, and their intensities I3,I2. ZrO2 nanoparticles had a better interfacial interaction with the PVA matrix, which resulted in a higher Tg and shorter o-Ps lifetime (τ3). The positron trapping rate increased for ZrO2/PVA polymer ceramic composite (PCC), which indicated that both volume expansion and vacancy trapping effects occur when the positrons are effectively trapped at vacancies. The Nyquist plot for dielectric measurement was investigated, and an equivalent circuit model was used to evaluate variables such as carrier concentration (n), mobility (μ), and diffusion coefficient/ diffusivity (D). Ionic conductivity of 2.77 × 10−7 S cm−1 was recorded for the ZrO2/PVA sample. This might be due to a change (increase) in the carrier concentration.
AB - This article presents a comparative analysis of three distinct zirconia-inserted polyvinyl alcohol (PVA) polymer matrices. X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), and atomic force microscopy (AFM) were used for the study of structural, chemical composition (functional groups), and morphological properties. Changes in IR bands revealed the interaction of nanofillers with the PVA matrix. ZrO2 added sample shows the lowest degree of crystallinity with the least free volume compared to pristine PVA. Threadlike chains and scattershot crystal morphologies were seen in AFM images, and the PVA/ZrO2 has the lowest level of roughness (1.27 nm). Positron annihilation lifetime profile showed identical behavior for τ3, τ2, and their intensities I3,I2. ZrO2 nanoparticles had a better interfacial interaction with the PVA matrix, which resulted in a higher Tg and shorter o-Ps lifetime (τ3). The positron trapping rate increased for ZrO2/PVA polymer ceramic composite (PCC), which indicated that both volume expansion and vacancy trapping effects occur when the positrons are effectively trapped at vacancies. The Nyquist plot for dielectric measurement was investigated, and an equivalent circuit model was used to evaluate variables such as carrier concentration (n), mobility (μ), and diffusion coefficient/ diffusivity (D). Ionic conductivity of 2.77 × 10−7 S cm−1 was recorded for the ZrO2/PVA sample. This might be due to a change (increase) in the carrier concentration.
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U2 - 10.1016/j.jnoncrysol.2022.121696
DO - 10.1016/j.jnoncrysol.2022.121696
M3 - Article
AN - SCOPUS:85130394974
SN - 0022-3093
VL - 590
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
M1 - 121696
ER -