Papers by Lakshmi Unnikrishnan
Wiley eBooks, Oct 13, 2017
High Performance Polymers, May 21, 2013
CRC Press eBooks, May 20, 2022
Surface and Interface Analysis
Polymer-korea, Jan 31, 2021
Journal of Polymer Materials, 2022
Korean Journal of Chemical Engineering, 2022
MMMs have opened up a new window in gas separation and purification applications, but the actual ... more MMMs have opened up a new window in gas separation and purification applications, but the actual viability can be reckoned on the basis of performance achieved in realistic feed conditions. This research highlights the selection of silica-decorated graphene for the first time to prepare nanocomposite membranes. XRD, Raman, and UV validated the existence of different fillers within the host Polysulfone (PSf), while TEM authenticated their distribution. The burst strength and thermal properties were also investigated for the prepared samples. This study also covered a prudent step towards resolving the dominant ingredients, which routinely appraise the stability and durability of the membranes. These indexes are long-term gas permeation stability up to 120 hours coupled with sustainability against hydrothermal and chemical resistance under various conditions similar to real-life gas separation applications. Finally, the report demonstrates that the nanohybrid integrated membrane systems display optimum performance and stability in all the aspects as compared to their parent counterparts: PSf/mSiO 2 and PSf/GO.
Polymer Reviews, 2019
Abstract In last two decades, acid doped polybenzimidazole as polymer electrolyte membrane (PEM) ... more Abstract In last two decades, acid doped polybenzimidazole as polymer electrolyte membrane (PEM) has been widely recognized and envisioned as “ideal” proton conducting materials for application in high temperature PEM fuel cell (HT-PEMFC). The majority of research and developmental work is mainly focused on poly (2,2´-m-phenylene-5,5´-bibenzimidazole), However, it is neither easy-processed nor inexpensive component of the respective family. On the other hand, among the various members belonging to benzimidazole family, poly (2,5-benzimidazole) is unique because it possesses a cost-attractive, single-step synthesis process, high extent of doping as well as good chemical and thermal stability. In the recent years this material has proved its potency in the earlier research. Thus this review puts special emphasis on poly (2,5-benzimidazole) and epitomizes the on-going breath-taking progress and achievements on the fabrication of poly (2,5-benzimidazole) based membranes. The write-up describes the effect of blending, cross-linking, ionic liquids and incorporation organic/inorganic nano-fillers. In addition, incorporating other protonic dopants such as heteropoly acids into the chain of poly (2,5-benzimidazole) molecular skeleton is also overviewed. Moreover, the critical interpretation of different causes responsible for earlier degradation and their effect towards the fabrication of high temperature membrane electrode assembly are visualized herein. Highlights Current developments and existing challenges of ABPBI in PEMFC have been reviewed. PEM Modification and addition of protonic dopants has been discussed. Proton migration, permeability, stability and reliability are thoroughly illustrated. Different ABPBI-based membranes and their performance are comparatively analyzed. Graphical Abstract
International Journal of Plastics Technology, 2010
Journal of Applied Polymer Science, 2011
Poly(Llactide) (PLA) was blended with polypropylene (PP) at various ratios (PLA:PP = 90 : 10, 80 ... more Poly(Llactide) (PLA) was blended with polypropylene (PP) at various ratios (PLA:PP = 90 : 10, 80 : 20, 70 : 30, and 50 : 50) with a melt‐blending technique in an attempt to improve the melt processability of PLA. Maleic anhydride (MAH)‐grafted PP and glycidyl methacrylate were used as the reactive compatibilizers to induce miscibility in the blend. The PLA/PP blend at a blend ratio of 90 : 10, exhibited optimum mechanical performance. Differential scanning calorimetry and thermogravimetric analysis studies showed that the PLA/PP/MAH‐g‐PP blend had the maximum thermal stability with the support of the heat deflection temperature values. Furthermore, dynamic mechanical analysis findings revealed an increase in the glass‐transition temperature and storage modulus with the addition of MAH‐g‐PP compatibilizer. The interaction between the compatibilizers and constituent polymers was confirmed from Fourier transform infrared spectra, and scanning electron microscopy of impact‐fractured sam...
Journal of Polymer Research
Materials Today Communications
MMMs have been opened up a new window in gas separation and purification applications, but the ac... more MMMs have been opened up a new window in gas separation and purification applications, but the actual viability can be reckoned on the basis of performance achieved in realistic feed conditions. This research highlights the selection of silica decorated graphene for the first time to prepare nanocomposite membranes. In the study, XRD, Raman, and UV validated the existence of the different fillers within the host Polysulfone (PSf), while TEM authenticated their distribution. The burst strength and thermal properties were also investigated. Besides, it covered a prudent step towards resolving the dominant ingredients, which routinely appraise the stability and durability of the membranes. These indexes are long-term gas permeation up to 120 hours coupled with sustainability against hydrothermal and chemical resistance under various conditions similar to real-life separation applications. Finally, the report demonstrated that the nanohybrid integrated membrane systems displayed optimum...
Journal of Polymer Research, 2021
The recent work evaluates the effect of ethylene methacrylate (EMA) as an impact modifier and the... more The recent work evaluates the effect of ethylene methacrylate (EMA) as an impact modifier and the hybrid filler constitutes graphite flakes (GF), multiwalled carbon nanotubes (MWCNT), and steel fibers (SF) for the development of polycarbonate (PC) based conducting composite with high thermal conductivity and EMI shielding. The samples were initially optimized based on their mechanical properties, which were further characterized by thermal conductivity (TC) and electromagnetic interference shielding effectiveness (EMI SE). The thermal conductivity of the polycarbonate (PC) nanocomposites was found to increase by ~ 451% and ~ 602% at a significantly higher filler loading of 20 wt% and 30 wt% respectively without any processing difficulties. Further, the EMI SE values of the same have been enhanced in the range of -40.2 dB and -46.4 dB respectively, which falls within the range of commercially acceptable limits. Nonetheless, the results were indicative of the creation of a conductive network through the matrix, the electron microscopic and diffractometric studies confirmed the optimum dispersion of the hybrid filler system within the PC matrix.
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Papers by Lakshmi Unnikrishnan