Souvik Ata - Academia.edu (original) (raw)
Papers by Souvik Ata
Advanced Science, Engineering and Medicine, 2014
This investigation reports a comparative study of the preparation and properties of tailor-made p... more This investigation reports a comparative study of the preparation and properties of tailor-made poly(2-ethylhexyl acrylate) (PEHA)/clay nanocomposite prepared via in situ atom transfer radical polymerization and surface initiated atom transfer radical polymerization (SI-ATRP). Being a low Tg (−65 C) material, PEHA has very good film formation property for which it is used in paints, adhesives and coating applications. In situ PEHA/clay nanocomposite was prepared by polymerizing EHA in presence of nanoclay and acetone as additive at 90 C using methyl 2-bromopropionate (MBrP) as initiator, CuBr as catalyst in combination with N,N,N′,N′′,N′′-pentamethyl diethylenetriamine (PMDETA) as ligand. The functionalized nanoclay was used to prepare PEHA/clay nanocomposite in presence of acetone as additive at 90 C using CuBr as catalyst in combination with N,N,N′,N′′,N′′pentamethyl diethylenetriamine (PMDETA) as ligand. Kinetic plots were prepared for in situ ATRP as well as SI-ATRP. The prepared nanocomposites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) analyses. Distribution of nanoclay in the polymer matrix was studied by the transmission electron microscopy (TEM).
ACS Applied Materials & Interfaces, 2012
Acrylic block copolymers have several advantages over conventional styrenic block copolymers, bec... more Acrylic block copolymers have several advantages over conventional styrenic block copolymers, because of the presence of a saturated backbone and polar pendant groups. This investigation reports the preparation and characterization of di-and tri-block copolymers (AB and ABA types) of 2-ethylhexyl acrylate (EHA) and methyl methacrylate (MMA) via atom transfer radical polymerization (ATRP). A series of block copolymers, PEHA-block-PMMA(AB diblock) and PMMA-block-PEHA-block-PMMA(ABA triblock) were prepared via ATRP at 90 °C using CuBr as catalyst in combination with N, N, N´, N´´, N´´-pentamethyl diethylenetriamine (PMDETA) as ligand and acetone as additive. The chemical structure of the macroinitiators and molar composition of block copolymers were characterized by 1 H NMR analysis and molecular weights of the polymers were analyzed by GPC analysis. DSC analysis showed two glass transition temperatures (T g) indicating formation of two domains which was corroborated by AFM analysis. Small angle X-ray scattering (SAXS) analysis of AB and ABA block
Polymer, 2016
Abstract In this investigation we report the preparation of a hybrid material based on graphene o... more Abstract In this investigation we report the preparation of a hybrid material based on graphene oxide (GO) and POSS by surface modification of graphene oxide (GO) via SI-ATRP of methacryloisobutyl POSS (MAPOSS) and synthesis of composite hydrogel based on this material. This hybrid material (GO-PMAPOSS) was duly characterized by FTIR, Raman analysis, GPC, TEM, FESEM, goniometry and TGA analyses. Compared to GO, PMAPOSS modified GO showed better solubility in organic solvent (THF) and higher hydrophobicity. Later this GO-PMAPOSS hybrid material was introduced into starch-polyacrylamide based semi IPN hydrogel which was prepared by using free radical polymerization of acrylamide in presence of starch. TEM and FESEM analyses revealed that GO-PMAPOSS hybrid material formed a hydrophobic path inside the hydrogel through self-association of the hydrophobic POSS chains. It was noticed that the presence of this hydrophobic part on hydrogel surface and in bulk phase helped to reduce the platelet adhesion as compared to hydrogel without GO-PMAPOSS hybrid material. The composite hydrogel also showed superior red blood cell compatibility and good cytocompatibility. This composite hydrogel was capable of performing controlled release of drug. Here Ciprofloxacin was used as a model antibiotic drug.
Journal of polymer research, Jan 7, 2017
This investigation reports the preparation and self-assembly behavior of polyhedral oligomeric si... more This investigation reports the preparation and self-assembly behavior of polyhedral oligomeric silsesquioxane (POSS) containing poly(caprolactone)-graft-poly(acrylic acid) (POSS-PCL-graft-PAA) polymer. This article focuses on the self-assembly behavior of POSS tethered amphiphilic graft copolymer. In this investigation, POSS tethered alkyne functionalized polycaprolactone (PCL) was prepared by strategic ring opening polymerization (ROP) of ε-caprolactone and α-propargyl-ε-caprolactone using hydroxyl-terminated POSS as an initiator. Azide-terminated poly(tert-butyl acrylate) (PtBA) was grafted onto functional PCL via Cu-catalyzed azide-alkyne “click” (CuAAC) reaction. Finally, hydrolysis of the tert-butyl ester group into acid furnished the POSS tethered PCL-graft-PAA polymer. This amphiphilic graft copolymer was characterized by GPC, NMR, and FT-IR analyses and the morphology of the graft copolymer analyzed by HRTEM and FESEM analyses. On changing the graft copolymer concentration (low to high) in water, the morphology of the final graft copolymer changed from micelles to worm-like and core-shell. The structural motif of POSS plays an important role in this morphological transformation. The pH sensitivity was studied using DLS analysis as well as via release profile of rhodamine B as a model compound.
European Polymer Journal, 2016
Advanced Science, Engineering and Medicine, 2014
This investigation reports a comparative study of the preparation and properties of tailor-made p... more This investigation reports a comparative study of the preparation and properties of tailor-made poly(2-ethylhexyl acrylate) (PEHA)/clay nanocomposite prepared via in situ atom transfer radical polymerization and surface initiated atom transfer radical polymerization (SI-ATRP). Being a low Tg (−65 C) material, PEHA has very good film formation property for which it is used in paints, adhesives and coating applications. In situ PEHA/clay nanocomposite was prepared by polymerizing EHA in presence of nanoclay and acetone as additive at 90 C using methyl 2-bromopropionate (MBrP) as initiator, CuBr as catalyst in combination with N,N,N′,N′′,N′′-pentamethyl diethylenetriamine (PMDETA) as ligand. The functionalized nanoclay was used to prepare PEHA/clay nanocomposite in presence of acetone as additive at 90 C using CuBr as catalyst in combination with N,N,N′,N′′,N′′pentamethyl diethylenetriamine (PMDETA) as ligand. Kinetic plots were prepared for in situ ATRP as well as SI-ATRP. The prepared nanocomposites were characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide-angle X-ray diffraction (WAXD) analyses. Distribution of nanoclay in the polymer matrix was studied by the transmission electron microscopy (TEM).
ACS Applied Materials & Interfaces, 2012
Acrylic block copolymers have several advantages over conventional styrenic block copolymers, bec... more Acrylic block copolymers have several advantages over conventional styrenic block copolymers, because of the presence of a saturated backbone and polar pendant groups. This investigation reports the preparation and characterization of di-and tri-block copolymers (AB and ABA types) of 2-ethylhexyl acrylate (EHA) and methyl methacrylate (MMA) via atom transfer radical polymerization (ATRP). A series of block copolymers, PEHA-block-PMMA(AB diblock) and PMMA-block-PEHA-block-PMMA(ABA triblock) were prepared via ATRP at 90 °C using CuBr as catalyst in combination with N, N, N´, N´´, N´´-pentamethyl diethylenetriamine (PMDETA) as ligand and acetone as additive. The chemical structure of the macroinitiators and molar composition of block copolymers were characterized by 1 H NMR analysis and molecular weights of the polymers were analyzed by GPC analysis. DSC analysis showed two glass transition temperatures (T g) indicating formation of two domains which was corroborated by AFM analysis. Small angle X-ray scattering (SAXS) analysis of AB and ABA block
Polymer, 2016
Abstract In this investigation we report the preparation of a hybrid material based on graphene o... more Abstract In this investigation we report the preparation of a hybrid material based on graphene oxide (GO) and POSS by surface modification of graphene oxide (GO) via SI-ATRP of methacryloisobutyl POSS (MAPOSS) and synthesis of composite hydrogel based on this material. This hybrid material (GO-PMAPOSS) was duly characterized by FTIR, Raman analysis, GPC, TEM, FESEM, goniometry and TGA analyses. Compared to GO, PMAPOSS modified GO showed better solubility in organic solvent (THF) and higher hydrophobicity. Later this GO-PMAPOSS hybrid material was introduced into starch-polyacrylamide based semi IPN hydrogel which was prepared by using free radical polymerization of acrylamide in presence of starch. TEM and FESEM analyses revealed that GO-PMAPOSS hybrid material formed a hydrophobic path inside the hydrogel through self-association of the hydrophobic POSS chains. It was noticed that the presence of this hydrophobic part on hydrogel surface and in bulk phase helped to reduce the platelet adhesion as compared to hydrogel without GO-PMAPOSS hybrid material. The composite hydrogel also showed superior red blood cell compatibility and good cytocompatibility. This composite hydrogel was capable of performing controlled release of drug. Here Ciprofloxacin was used as a model antibiotic drug.
Journal of polymer research, Jan 7, 2017
This investigation reports the preparation and self-assembly behavior of polyhedral oligomeric si... more This investigation reports the preparation and self-assembly behavior of polyhedral oligomeric silsesquioxane (POSS) containing poly(caprolactone)-graft-poly(acrylic acid) (POSS-PCL-graft-PAA) polymer. This article focuses on the self-assembly behavior of POSS tethered amphiphilic graft copolymer. In this investigation, POSS tethered alkyne functionalized polycaprolactone (PCL) was prepared by strategic ring opening polymerization (ROP) of ε-caprolactone and α-propargyl-ε-caprolactone using hydroxyl-terminated POSS as an initiator. Azide-terminated poly(tert-butyl acrylate) (PtBA) was grafted onto functional PCL via Cu-catalyzed azide-alkyne “click” (CuAAC) reaction. Finally, hydrolysis of the tert-butyl ester group into acid furnished the POSS tethered PCL-graft-PAA polymer. This amphiphilic graft copolymer was characterized by GPC, NMR, and FT-IR analyses and the morphology of the graft copolymer analyzed by HRTEM and FESEM analyses. On changing the graft copolymer concentration (low to high) in water, the morphology of the final graft copolymer changed from micelles to worm-like and core-shell. The structural motif of POSS plays an important role in this morphological transformation. The pH sensitivity was studied using DLS analysis as well as via release profile of rhodamine B as a model compound.
European Polymer Journal, 2016