Browsing by Author "Prem N. Gupta"

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Introduction to smart polymers and their application
(Elsevier, 2022) Aiswarya Chaudhuri; Kamalpreet Kaur Sandha; Ashish Kumar Agrawal; Prem N. Gupta
Adaptation is the key feature that permits the living system to respond to the external environment and get accustomed to the changing conditions. In a similar way, scientists have tried to develop polymers that could mold themselves according to the external/surrounding changes (stimulus) and form a more compatible system. This leads to the emergence of “smart polymers” that undergo physical or chemical changes in response to small environmental changes (temperature, light, pH, etc.), which proves the versatility as well as the sensitivity of the smart polymers. It could be stated that smart polymers lead to the development of much tunable, programmable, and accurate systems. Smart polymers were extensively used in the field of biomedicine which includes tissue engineering, the cell culture system, drug delivery system, sensors or actuators, and biomedical devices. This chapter provides a wide overview of smart polymers and the most interesting applications developed so far. © 2023 Elsevier Inc. All rights reserved.
Structural and electrical characterization of plasticized PVA: AgI polymer electrolyte
(2011) Govind K. Prajapati; Rupesh Roshan; Prem N. Gupta
The development of new polymeric systems with high ionic conductivity is one of the main objectives in the field of polymer materials with application point of view. In the present work, Ag+ ion conducting solvent free composite polymer electrolyte thin films have been prepared using polyvinyl alcohol (PVA) as host polymer and polyethylene glycol (PEG) as plasticizer by standard solution cast technique. The structural characteristics of the prepared films have been obtained from X-ray diffraction (XRD) patterns. Maximum room temperature ionic conductivity of order of 10-5 S cm-1 is obtained using complex admittance (B-G) spectroscopy. The temperature dependent conductivity shows two distinct regions of Arrhenius type thermally activated behavior before and after glass transition temperature. Dielectric constant, ε′ and dielectric loss, ε″ of the samples increases with temperature which is similar in behavior as that of conductivity. The activation energy for ion conduction has been calculated from temperature dependent conductivity curve and its minimum value is found to be 0.30 eV for PVA-PEG-20 % AgI polymer electrolyte sample. High value of transference number shows that samples are ionic in nature which is confirmed by Wagner's polarization technique. © 2011 by Walter de Gruyter. Berlin. Boston.