Nabarun Roy | IIT Kharagpur (original) (raw)
Supervisors: Prof. Anil K. Bhowmick
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CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)
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Papers by Nabarun Roy
Polymers & polymer …, Jan 1, 2010
Résumé/Abstract Liquid silicone rubber (LSR) vulcanizates have been prepared from vinyl-end cappe... more Résumé/Abstract Liquid silicone rubber (LSR) vulcanizates have been prepared from vinyl-end capped polydimethylsiloxane (PDMS) and polymethylhydrogenosiloxane (PMHS) in presence of platinum catalyst using solution casting technique. The science involving synthesis of usable silicone rubber by curing with polymethylhydrogenosiloxane has been studied in details. The effects of vinyl content of PDMS and the ratio of hydride crosslinker to vinyl concentration on crosslink density, mechanical, dynamic-mechanical and thermal ...
Journal of Materials Science, Jan 1, 2011
For the first time, a series of carbon nanofiber (CNF)/polydimethylsiloxane(PDMS)-based nanocompo... more For the first time, a series of carbon nanofiber (CNF)/polydimethylsiloxane(PDMS)-based nanocomposites was prepared using in situ polymerization technique by critical manipulation of factors, such as method of preparation and chemical modification of filler. Quantification of the degree of dispersion was done by introducing a dispersion degree parameter. Extent of dispersion was found to improve by amine modification of CNFs. Electrical conductivity was found to undergo profound increase when compared with that of the insulating base polymer. Aminemodified CNF-based nanocomposites showed percolation threshold at lower filler loading compared with unmodified CNF-based nanocomposites. These results of electrical properties measurements were correlated with the results of TEM analysis.
Journal of Applied Polymer Science, Jan 1, 2012
A series of carbon nanofiber (CNF)/polydimethylsiloxane (PDMS)-based nanocomposites was prepared ... more A series of carbon nanofiber (CNF)/polydimethylsiloxane (PDMS)-based nanocomposites was prepared by anionic ring opening polymerization of octamethylcyclotetrasiloxane (D 4 ) in presence of pristine CNF and aminemodified CNF. A detailed study of morphology-property relationship of the nanocomposites was carried out in order to understand the effect of chemical modification and loading of filler on property enhancement of the nanocomposites. An elaborate comparison of structure and properties was carried out for the nanocomposites prepared by in situ and conventional ex situ methods. Pronounced improvement in degree of dispersion of the fillers in the matrix on amine modification of CNFs was reflected in mechanical properties of the modified nanocomposites. Maximum upliftment in mechanical properties was observed for in situ prepared amine modified CNF/hydroxyl PDMS nanocomposites. For 8 phr filler loading, tensile strength increased by 370%, while tensile modulus showed an increase of 515% compared with the virgin elastomer. Furthermore, in situ prepared unmodified CNF/hydroxyl PDMS nanocomposites showed an increase of 141 C in temperature of maximum degradation (T max ) for 8 phr CNF loading. These results were correlated with the morphological analysis through transmission electron microscopic studies.
The Journal of Physical Chemistry C, Jan 1, 2012
Industrial & Engineering Chemistry …, Jan 1, 2012
Progress in Polymer Science, Jan 1, 2012
Abstract The various forms of carbon used in composite preparation include mainly carbon-black, c... more Abstract The various forms of carbon used in composite preparation include mainly carbon-black, carbon nanotubes and nanofibers, graphite and fullerenes. This review presents a detailed literature survey on the various modifications of the carbon nanostructures for ...
Rubber Chemistry and Technology, Jan 1, 2012
Polymer, Jan 1, 2010
A series of novel in situ polydimethylsiloxane (PDMS)-sepiolite nanocomposites were synthesized b... more A series of novel in situ polydimethylsiloxane (PDMS)-sepiolite nanocomposites were synthesized by anionic ring opening polymerization of octamethylcyclotetrasiloxane. These nanocomposites were characterized by Attenuated Total Reflection-Fourier Transform ...
Polymers & polymer …, Jan 1, 2010
Résumé/Abstract Liquid silicone rubber (LSR) vulcanizates have been prepared from vinyl-end cappe... more Résumé/Abstract Liquid silicone rubber (LSR) vulcanizates have been prepared from vinyl-end capped polydimethylsiloxane (PDMS) and polymethylhydrogenosiloxane (PMHS) in presence of platinum catalyst using solution casting technique. The science involving synthesis of usable silicone rubber by curing with polymethylhydrogenosiloxane has been studied in details. The effects of vinyl content of PDMS and the ratio of hydride crosslinker to vinyl concentration on crosslink density, mechanical, dynamic-mechanical and thermal ...
Journal of Materials Science, Jan 1, 2011
For the first time, a series of carbon nanofiber (CNF)/polydimethylsiloxane(PDMS)-based nanocompo... more For the first time, a series of carbon nanofiber (CNF)/polydimethylsiloxane(PDMS)-based nanocomposites was prepared using in situ polymerization technique by critical manipulation of factors, such as method of preparation and chemical modification of filler. Quantification of the degree of dispersion was done by introducing a dispersion degree parameter. Extent of dispersion was found to improve by amine modification of CNFs. Electrical conductivity was found to undergo profound increase when compared with that of the insulating base polymer. Aminemodified CNF-based nanocomposites showed percolation threshold at lower filler loading compared with unmodified CNF-based nanocomposites. These results of electrical properties measurements were correlated with the results of TEM analysis.
Journal of Applied Polymer Science, Jan 1, 2012
A series of carbon nanofiber (CNF)/polydimethylsiloxane (PDMS)-based nanocomposites was prepared ... more A series of carbon nanofiber (CNF)/polydimethylsiloxane (PDMS)-based nanocomposites was prepared by anionic ring opening polymerization of octamethylcyclotetrasiloxane (D 4 ) in presence of pristine CNF and aminemodified CNF. A detailed study of morphology-property relationship of the nanocomposites was carried out in order to understand the effect of chemical modification and loading of filler on property enhancement of the nanocomposites. An elaborate comparison of structure and properties was carried out for the nanocomposites prepared by in situ and conventional ex situ methods. Pronounced improvement in degree of dispersion of the fillers in the matrix on amine modification of CNFs was reflected in mechanical properties of the modified nanocomposites. Maximum upliftment in mechanical properties was observed for in situ prepared amine modified CNF/hydroxyl PDMS nanocomposites. For 8 phr filler loading, tensile strength increased by 370%, while tensile modulus showed an increase of 515% compared with the virgin elastomer. Furthermore, in situ prepared unmodified CNF/hydroxyl PDMS nanocomposites showed an increase of 141 C in temperature of maximum degradation (T max ) for 8 phr CNF loading. These results were correlated with the morphological analysis through transmission electron microscopic studies.
The Journal of Physical Chemistry C, Jan 1, 2012
Industrial & Engineering Chemistry …, Jan 1, 2012
Progress in Polymer Science, Jan 1, 2012
Abstract The various forms of carbon used in composite preparation include mainly carbon-black, c... more Abstract The various forms of carbon used in composite preparation include mainly carbon-black, carbon nanotubes and nanofibers, graphite and fullerenes. This review presents a detailed literature survey on the various modifications of the carbon nanostructures for ...
Rubber Chemistry and Technology, Jan 1, 2012
Polymer, Jan 1, 2010
A series of novel in situ polydimethylsiloxane (PDMS)-sepiolite nanocomposites were synthesized b... more A series of novel in situ polydimethylsiloxane (PDMS)-sepiolite nanocomposites were synthesized by anionic ring opening polymerization of octamethylcyclotetrasiloxane. These nanocomposites were characterized by Attenuated Total Reflection-Fourier Transform ...