Asokan Pappu | Ampri - Academia.edu (original) (raw)
Papers by Asokan Pappu
Journal of Scientific and Industrial Research (JSIR), Oct 9, 2021
Construction for a Sustainable Environment, 2009
Physica B: Condensed Matter, 2022
Journal of Alloys and Compounds, 2022
Physica B: Condensed Matter, 2021
Abstract In the present work, carbon nanotubes (CNT) reinforced industrial waste fly ash -based p... more Abstract In the present work, carbon nanotubes (CNT) reinforced industrial waste fly ash -based polymer nanocomposites are fabricated. Strong interfacial bonding between CNT-fly ash and epoxy was confirmed by SEM technique. Low water absorption of about 0.17% was observed from 20 vol % CNT reinforced nanocomposite sample. However, the water absorption slightly increases with the increase of CNT contents in fly ash-based nanocomposites due to hydrophilic and polar characteristics of CNT. Flexural strength of nanocomposites increases with increase of CNT amount. The enhancement in flexural strength is attributed to the high dispersion of the CNT in epoxy polymer and weakening of Vander Walls forces. Nanocomposites sheets exhibited a high dielectric constant of 38 at 100 Hz. Dielectric constant was drastically decreased from 38 to 10 for 5% CNT filled nanocomposites. Such behavior was attributed to the conducting nature of CNT and creation of space charge distribution in polymer matrix.
Industrial Crops and Products, 2022
International Journal of Waste Resources, 2016
Waste and Biomass Valorization, 2021
In this study, water resistant, super thermally insulating high-performance particulate reinforce... more In this study, water resistant, super thermally insulating high-performance particulate reinforced composites comprising marble waste particulates (MWP) and polypropylene (PP) are fabricated towards sustainable development. Water absorption behaviour of injection moulded MWP-PP composites of different filler concentrations (0, 20, 40, 60 and 80 weight%) is investigated with physical and mechanical properties. Water transport mechanism of fabricated MWP-PP particulate reinforced composites is explained using Fick’s diffusion law for the first time. This work is meaningful to the practical application of MWP-PP composites in buildings and transportation infrastructures. Physic-chemical and morphological characterization of marble waste particulates is carried out in detail. Physical (density, water absorption and thermal) and mechanical (flexural and impact) characterization of unsaturated and saturated composites are carried out. Ultra-low value of (0.093 ± 0.04 to 0.060 ± 0.01%) water absorption was obtained for different concentrations of MWP-PP particulate reinforced composites. Maximum flexural (53.05 ± 1.32 MPa) and impact (1.499 ± 0.10 kJ/m2) strength of saturated MWP-PP particulate reinforced composites is attained with 20 weight% filler concentration with flexural modulus in the range of 1.901 ± 0.15 to 3.462 ± 0.41 GPa and thermal conductivity of 0.35 ± 0.18 Wm−1 K−1. A prolific method of recycling marble waste as reinforcement in particulate reinforced composites is studied for application in water resistant architectural wall and insulation floor panels.
Construction and Building Materials, 2021
Abstract Enormous amount of accumulated waste is a matter of concern for environmental safety as ... more Abstract Enormous amount of accumulated waste is a matter of concern for environmental safety as it influences other precarious issues such as air pollution, land degradation, in addition to contamination of water & soil through leaching. A proficient recycling and management of generated solid waste is the key option to overcome such issues. Sustainable utilization of marble waste particulates as reinforcement in manufacturing LDPE-MW (low density polyethylene-marble waste) composites through injection moulding technique has been investigated. The mineralogical study of marble waste particulates revealed existence of dolomite (CaMg (CO3)2) and calcite (CaCO3) as major minerals with very small quantity of quartz (SiO2). Parallel results were obtained by thermal and FTIR analyses of marble waste particulates. The average particle size of marble waste particulates was 15.98 ± 3.319 µm with the bulk density 1.49 ± 0.007 g/cc and porosity 35 ± 1.85%. The pH was adjusted at 7.86 ± 0.003 and electrical conductivity was 3.78 ± 0.061 mS/cm. The FE-SEM analysis showed irregular morphology of marble waste particulates. Mechanical properties such as tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength of LDPE-MW composites were determined. Thermal conductivity of LDPE-MW composites was also reported. The obtained results showed maximum enhancement in the strength and thermal conductivity with incorporation of about 50% marble waste particulates. The findings of the present study revealed that there is considerable potential for large scale recycling of marble waste in making LDPE based hybrid materials, leads to create new application as architectural cladding wall panel, electrical insulating floor tiles and damping pads.
Polymers, 2020
Marble waste is generated by marble processing units in large quantities and dumped onto open lan... more Marble waste is generated by marble processing units in large quantities and dumped onto open land areas. This creates environmental problems by contaminating soil, water, and air with adverse health effects on all the living organisms. In this work, we report on understanding the use of calcium-rich marble waste particulates (MPs) as economic reinforcement in recyclable polypropylene (PP) to prepare sustainable composites via the injection molding method. The process was optimized to make lightweight and high-strength thermally insulated sustainable composites. Physicochemical, mineralogical, and microscopic characterization of the processed marble waste particulates were carried out in detail. Composite samples were subsequently prepared via the injection molding technique with different filler concentrations (0%, 20%, 40%, 60%, and 80%) on weight fraction at temperatures of 160, 180, and 200 °C. Detailed analysis of the mechanical and thermal properties of the fabricated composit...
SN Applied Sciences, 2020
Bulletin of Materials Science, 2019
Composites Part B: Engineering, 2019
Journal of Cleaner Production, 2019
Materials Letters, 2019
Abstract Epoxy composites exhibiting high dielectric constant, low dissipation and reduced water ... more Abstract Epoxy composites exhibiting high dielectric constant, low dissipation and reduced water absorption were prepared using a functionalized agro-waste as filler. The approach involved thin coating of Polypyrrole (PPy) conducting polymer over micron sized paddy straw (St) particles accomplished via vapour phase polymerization. The PPy coated particles filled epoxy composites exhibited a significant ∼315% increase in dielectric constant (∼23 at 1 KHz), low dissipation factor (0.017 at 1 KHz) and marked reduction in water absorption (∼50%; 360 h) as compared to their counterparts filled with uncoated particles. The successful preparation of these composites with improved performance and lightweight paves the way for very low cost sustainable and eco-friendly materials for high end electronics and sensing applications.
Industrial Crops and Products, 2019
Current Opinion in Green and Sustainable Chemistry, 2018
Journal of Scientific and Industrial Research (JSIR), Oct 9, 2021
Construction for a Sustainable Environment, 2009
Physica B: Condensed Matter, 2022
Journal of Alloys and Compounds, 2022
Physica B: Condensed Matter, 2021
Abstract In the present work, carbon nanotubes (CNT) reinforced industrial waste fly ash -based p... more Abstract In the present work, carbon nanotubes (CNT) reinforced industrial waste fly ash -based polymer nanocomposites are fabricated. Strong interfacial bonding between CNT-fly ash and epoxy was confirmed by SEM technique. Low water absorption of about 0.17% was observed from 20 vol % CNT reinforced nanocomposite sample. However, the water absorption slightly increases with the increase of CNT contents in fly ash-based nanocomposites due to hydrophilic and polar characteristics of CNT. Flexural strength of nanocomposites increases with increase of CNT amount. The enhancement in flexural strength is attributed to the high dispersion of the CNT in epoxy polymer and weakening of Vander Walls forces. Nanocomposites sheets exhibited a high dielectric constant of 38 at 100 Hz. Dielectric constant was drastically decreased from 38 to 10 for 5% CNT filled nanocomposites. Such behavior was attributed to the conducting nature of CNT and creation of space charge distribution in polymer matrix.
Industrial Crops and Products, 2022
International Journal of Waste Resources, 2016
Waste and Biomass Valorization, 2021
In this study, water resistant, super thermally insulating high-performance particulate reinforce... more In this study, water resistant, super thermally insulating high-performance particulate reinforced composites comprising marble waste particulates (MWP) and polypropylene (PP) are fabricated towards sustainable development. Water absorption behaviour of injection moulded MWP-PP composites of different filler concentrations (0, 20, 40, 60 and 80 weight%) is investigated with physical and mechanical properties. Water transport mechanism of fabricated MWP-PP particulate reinforced composites is explained using Fick’s diffusion law for the first time. This work is meaningful to the practical application of MWP-PP composites in buildings and transportation infrastructures. Physic-chemical and morphological characterization of marble waste particulates is carried out in detail. Physical (density, water absorption and thermal) and mechanical (flexural and impact) characterization of unsaturated and saturated composites are carried out. Ultra-low value of (0.093 ± 0.04 to 0.060 ± 0.01%) water absorption was obtained for different concentrations of MWP-PP particulate reinforced composites. Maximum flexural (53.05 ± 1.32 MPa) and impact (1.499 ± 0.10 kJ/m2) strength of saturated MWP-PP particulate reinforced composites is attained with 20 weight% filler concentration with flexural modulus in the range of 1.901 ± 0.15 to 3.462 ± 0.41 GPa and thermal conductivity of 0.35 ± 0.18 Wm−1 K−1. A prolific method of recycling marble waste as reinforcement in particulate reinforced composites is studied for application in water resistant architectural wall and insulation floor panels.
Construction and Building Materials, 2021
Abstract Enormous amount of accumulated waste is a matter of concern for environmental safety as ... more Abstract Enormous amount of accumulated waste is a matter of concern for environmental safety as it influences other precarious issues such as air pollution, land degradation, in addition to contamination of water & soil through leaching. A proficient recycling and management of generated solid waste is the key option to overcome such issues. Sustainable utilization of marble waste particulates as reinforcement in manufacturing LDPE-MW (low density polyethylene-marble waste) composites through injection moulding technique has been investigated. The mineralogical study of marble waste particulates revealed existence of dolomite (CaMg (CO3)2) and calcite (CaCO3) as major minerals with very small quantity of quartz (SiO2). Parallel results were obtained by thermal and FTIR analyses of marble waste particulates. The average particle size of marble waste particulates was 15.98 ± 3.319 µm with the bulk density 1.49 ± 0.007 g/cc and porosity 35 ± 1.85%. The pH was adjusted at 7.86 ± 0.003 and electrical conductivity was 3.78 ± 0.061 mS/cm. The FE-SEM analysis showed irregular morphology of marble waste particulates. Mechanical properties such as tensile strength, tensile modulus, flexural strength, flexural modulus and impact strength of LDPE-MW composites were determined. Thermal conductivity of LDPE-MW composites was also reported. The obtained results showed maximum enhancement in the strength and thermal conductivity with incorporation of about 50% marble waste particulates. The findings of the present study revealed that there is considerable potential for large scale recycling of marble waste in making LDPE based hybrid materials, leads to create new application as architectural cladding wall panel, electrical insulating floor tiles and damping pads.
Polymers, 2020
Marble waste is generated by marble processing units in large quantities and dumped onto open lan... more Marble waste is generated by marble processing units in large quantities and dumped onto open land areas. This creates environmental problems by contaminating soil, water, and air with adverse health effects on all the living organisms. In this work, we report on understanding the use of calcium-rich marble waste particulates (MPs) as economic reinforcement in recyclable polypropylene (PP) to prepare sustainable composites via the injection molding method. The process was optimized to make lightweight and high-strength thermally insulated sustainable composites. Physicochemical, mineralogical, and microscopic characterization of the processed marble waste particulates were carried out in detail. Composite samples were subsequently prepared via the injection molding technique with different filler concentrations (0%, 20%, 40%, 60%, and 80%) on weight fraction at temperatures of 160, 180, and 200 °C. Detailed analysis of the mechanical and thermal properties of the fabricated composit...
SN Applied Sciences, 2020
Bulletin of Materials Science, 2019
Composites Part B: Engineering, 2019
Journal of Cleaner Production, 2019
Materials Letters, 2019
Abstract Epoxy composites exhibiting high dielectric constant, low dissipation and reduced water ... more Abstract Epoxy composites exhibiting high dielectric constant, low dissipation and reduced water absorption were prepared using a functionalized agro-waste as filler. The approach involved thin coating of Polypyrrole (PPy) conducting polymer over micron sized paddy straw (St) particles accomplished via vapour phase polymerization. The PPy coated particles filled epoxy composites exhibited a significant ∼315% increase in dielectric constant (∼23 at 1 KHz), low dissipation factor (0.017 at 1 KHz) and marked reduction in water absorption (∼50%; 360 h) as compared to their counterparts filled with uncoated particles. The successful preparation of these composites with improved performance and lightweight paves the way for very low cost sustainable and eco-friendly materials for high end electronics and sensing applications.
Industrial Crops and Products, 2019
Current Opinion in Green and Sustainable Chemistry, 2018