The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Akkihebbal K. Suresh - One of the best experts on this subject based on the ideXlab platform.
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Kinetics of Interfacial Polycondensation reactions – Development of a new method and its validation
Polymer, 2017Co-Authors: Subhalaxmi Behera, Akkihebbal K. SureshAbstract:Abstract The structure and function of the thin polymeric functional layer in reverse osmosis membranes depend on the kinetics of the Interfacial Polycondensation (IP) reaction by which the film is formed. It has been a challenge to achieve a quantitative understanding of these kinetics because of the high velocity of the reactions and the complex geometry of the support membrane in which the reaction takes place. In this work, we describe a novel and convenient technique for studying such kinetics, and demonstrate the method on the IP reaction between meta -phenylene diamine and trimesoyl chloride. The method involves studying the reaction in a simple geometry of a drop-continuous phase interface in an emulsion, under such conditions that all transport resistances are eliminated. The reaction course is followed through an on-line pH measurement using a fast probe. Interfacial areas available for reaction are measured by an encapsulation technique, under the conditions of reaction. The methods developed have been used to study the kinetics of the m -PDA-TMC reaction as a function of m -PDA concentration and surfactant (tween-85) concentration, and a surface-area based rate function has been shown to fit the data adequately.
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Understanding Interfacial Polycondensation: Experiments on polyurea system and comparison with theory
Polymer, 2010Co-Authors: Sunil S. Dhumal, Akkihebbal K. SureshAbstract:Abstract Interfacial Polycondensation, with its multiphase character and the involvement of several rate and equilibrium processes, presents unique challenges to our ability to understand and design processes for achieving desired properties. In a recent study [1] , we have presented a detailed model for the process and shown that it explains the salient features as reported in the literature for several Interfacial systems. In the present paper, we report extensive experimental studies on the polyurea system and their comparison with the model. Two geometries – the spherical geometry of the microcapsule and the flat-film geometry – have been used to study qualitative and quantitative features of the Polycondensation and the nature of the film that forms. While some aspects, such as the manner in which the solvent influences the kinetics, confirm earlier findings, inadequacies have been identified in the sample preparation protocols followed in earlier work, because of which property estimations may carry a large error. Improved protocols have accordingly been developed and used to study the development of film properties in time and as a function of the important preparation variables. Detailed molecular weight distributions have been determined using a GPC technique and used to derive important properties of the polyurea (such as Mark–Houwink parameters) as well as to gain insights into mechanisms. The data have been used to determine the rate parameters in the Dhumal and Suresh [1] model. The predictions of the model, as far as trends are concerned, are shown to be satisfactory given the level of uncertainty about parameter values and the complexity of the system being studied. Where discrepancies exist, the reasons have been established and the areas for improvement of the model identified. The findings reported are of interest to applications such as controlled release and membrane separations, in which permeation rate through the membrane is of importance and depends upon various membrane properties like crystallinity, morphology, etc.
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Interfacial Polycondensation—Modeling of kinetics and film properties
Journal of Membrane Science, 2008Co-Authors: Sunil S. Dhumal, Shrikant J. Wagh, Akkihebbal K. SureshAbstract:Interfacial Polycondensation (IP) is an important technique used in the encapsulation of a variety of active ingredients and synthesis of thin film composite membranes. The present work seeks to advance our understanding of the mechanisms underlying the reaction, phase separation and film formation in this process, and hence, of how the film properties are influenced by preparation conditions. The model presented here incorporates all the essential physicochemical processes at a fundamental level through simple phenomenologies: ionic equilibria in the aqueous phase, resistances due to external mass transfer, diffusion through polymer film, Interfacial reaction, thermodynamics of phase separation, and formation of a coherent film. The model has been tested against the data previously communicated [S.J. Wagh, Studies in Interfacial Polycondensation. Ph.D. Thesis. IIT Bombay, 2004; S.J. Wagh, S.S. Dhumal, A.K. Suresh, An experimental study of polyurea membrane formation by Interfacial Polycondensation, Journal of Membrane Science, submitted for publication] on polyurea microcapsules. The influence of the model parameters and preparation conditions, on the properties of the polymer and film and their development during reaction, have been studied. The study provides important insights into the process and should help in designing synthesis methodologies to suit the application.© Elsevie
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Interfacial Polycondensation modeling of kinetics and film properties
Journal of Membrane Science, 2008Co-Authors: Sunil S. Dhumal, Shrikant J. Wagh, Akkihebbal K. SureshAbstract:Interfacial Polycondensation (IP) is an important technique used in the encapsulation of a variety of active ingredients and synthesis of thin film composite membranes. The present work seeks to advance our understanding of the mechanisms underlying the reaction, phase separation and film formation in this process, and hence, of how the film properties are influenced by preparation conditions. The model presented here incorporates all the essential physicochemical processes at a fundamental level through simple phenomenologies: ionic equilibria in the aqueous phase, resistances due to external mass transfer, diffusion through polymer film, Interfacial reaction, thermodynamics of phase separation, and formation of a coherent film. The model has been tested against the data previously communicated [S.J. Wagh, Studies in Interfacial Polycondensation. Ph.D. Thesis. IIT Bombay, 2004; S.J. Wagh, S.S. Dhumal, A.K. Suresh, An experimental study of polyurea membrane formation by Interfacial Polycondensation, Journal of Membrane Science, submitted for publication] on polyurea microcapsules. The influence of the model parameters and preparation conditions, on the properties of the polymer and film and their development during reaction, have been studied. The study provides important insights into the process and should help in designing synthesis methodologies to suit the application.
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Release rates from semi-crystalline polymer microcapsules formed by Interfacial Polycondensation
Journal of Membrane Science, 1997Co-Authors: S. K. Yadav, Kartic C. Khilar, Akkihebbal K. SureshAbstract:Microencapsulation of active agents, for their controlled release, can be brought about by the method of Interfacial Polycondensation [1]. In this paper, the permeabilities of the polyurea microcapsules for encapsulated cyclohexane have been determined. It is shown that the product of the permeability and membrane thickness can be changed over at least an order of magnitude by changing the degree of crystallinity of the polymer forming the membranes.
Wiesław Rudź - One of the best experts on this subject based on the ideXlab platform.
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linear polythioesters xxiv products of Interfacial Polycondensation of bis 4 mercaptomethylphenyl sulphone with some aliphatic and phthaloyl dichlorides
European Polymer Journal, 1993Co-Authors: Wawrzyniec Podkościelny, Wiesław RudźAbstract:Abstract New polythioesters were obtained by Interfacial Polycondensation of bis(4-mercaptomethylphenyl) sulphone with some aliphatic and phthaloyl dichlorides. To determine optimal conditions for Polycondensation, the polythioester from bis(4-mercaptomethylphenyl)sulphone and sebacoyl chloride was chosen as a model system. The structures of polythioesters were determined by elemental analysis, infrared spectra (i.r.) and X-ray analysis. Thermal properties were examined by thermogravimetric analysis. Some physicochemical, mechanical and electrical properties have been studied.
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Linear polythioesters—XXIV. Products of Interfacial Polycondensation of bis(4-mercaptomethylphenyl)sulphone with some aliphatic and phthaloyl dichlorides
European Polymer Journal, 1993Co-Authors: Wawrzyniec Podkościelny, Wiesław RudźAbstract:Abstract New polythioesters were obtained by Interfacial Polycondensation of bis(4-mercaptomethylphenyl) sulphone with some aliphatic and phthaloyl dichlorides. To determine optimal conditions for Polycondensation, the polythioester from bis(4-mercaptomethylphenyl)sulphone and sebacoyl chloride was chosen as a model system. The structures of polythioesters were determined by elemental analysis, infrared spectra (i.r.) and X-ray analysis. Thermal properties were examined by thermogravimetric analysis. Some physicochemical, mechanical and electrical properties have been studied.
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Linear polythioesters—XXI. Products of Interfacial Polycondensation of bis(4-mercaptophenyl)sulphone with some aliphatic and isomeric phthaloyl dichlorides
European Polymer Journal, 1993Co-Authors: Wawrzyniec Podkościelny, Wiesław RudźAbstract:Abstract New polythioesters were obtained by Interfacial Polycondensation of bis(4-mercaptophenyl)sulphone with some aliphatic and isomeric phthaloyl dichlorides. To determine optimal conditions of Polycondensation, polythioesters from bis(4-mercaptophenyl)sulphone sebacoyl as well as isophthaloyl dichlorides were chosen as a model system. The structures of all polythioesters were determined by elemental analysis, i.r. and X-ray analysis. Initial decomposition temperature and maximum rate of decomposition temperature were defined from the curves of thermogravimetric analysis. Some physicochemical, mechanical and electrical properties have been determined.
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linear polythioesters xxi products of Interfacial Polycondensation of bis 4 mercaptophenyl sulphone with some aliphatic and isomeric phthaloyl dichlorides
European Polymer Journal, 1993Co-Authors: Wawrzyniec Podkościelny, Wiesław RudźAbstract:Abstract New polythioesters were obtained by Interfacial Polycondensation of bis(4-mercaptophenyl)sulphone with some aliphatic and isomeric phthaloyl dichlorides. To determine optimal conditions of Polycondensation, polythioesters from bis(4-mercaptophenyl)sulphone sebacoyl as well as isophthaloyl dichlorides were chosen as a model system. The structures of all polythioesters were determined by elemental analysis, i.r. and X-ray analysis. Initial decomposition temperature and maximum rate of decomposition temperature were defined from the curves of thermogravimetric analysis. Some physicochemical, mechanical and electrical properties have been determined.
Smaranda Iliescu - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Polycondensation method used in the synthesis of polymers containing phosphorus in the main chain
Pure and Applied Chemistry, 2014Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Adriana Popa, Nicoleta Plesu, Lavinia Macarie, Corneliu Mircea DavidescuAbstract:Abstract Polyphosphoesters gained importance especially due to their use as flame retardants and as biocompatible and biodegradable materials for medicine and in the pharmaceutical industry. This paper presents the results obtained by our research group in the synthesis of polyphosphoesters by Interfacial Polycondensation. This reaction is rapid and irreversible polymerization at the interface between a phase containing one difunctional intermediate and another phase containing a complementary difunctional reactant. Different methods like liquid–liquid, vapor–liquid or solid<uni-2013;liquid were used in the synthesis of polyphosphates of polyphosphonates using aliphatic/aromatic phosphoric/phosphonic dichlorides and different diols. Aqueous NaOH, or tripotasium phosphate were used as bases. In almost all cases a catalyst is not needed.
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Optimization of synthesis parameters in Interfacial Polycondensation using design of experiments
Polymer Bulletin, 2009Co-Authors: Smaranda Iliescu, Adriana Popa, Ion Grozav, Simona Funar-timofei, Nicoleta Plesu, Gheorghe IliaAbstract:The reaction of phenylphosphonic dichloride with 4,4′-cyclohexylidenebisphenol by a gas–liquid Interfacial Polycondensation was investigated. The design of experiments (DoE) method is used for determination of the best reaction conditions. The correlation of simultaneous influence of the parameters (reaction time, reaction temperature, alkaline medium, reagents molar ratio) on yield and inherent viscosity was studied.
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The synthesis of biodegradable poly(phosphate esters) by vapor-liquid Interfacial Polycondensation
Revue Roumaine De Chimie, 2005Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Adriana Popa, Nicoleta PlesuAbstract:This paper investigates the synthesis of polyphosphates by vapor-liquid Interfacial Polycondensation of phenyphosphoric dichloride (PPD) with different diphenols: bisphenol A(BA), 4,4'-sulfonyldiphenol (SDP) and 4,4'-biphenol (BP). The polyphosphates were characterized by IR, 1 H-NMR spectroscopy, gel permeation chromatography. The thermal stability of these polymers was evaluated by thermogravimetry.
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Study of the liquid-liquid Interfacial Polycondensation of cyclohexylphosphonic dichloride with bisphenol A. 31 Influence of the reaction temperature, reagents molar-ratio, phase-transfer catalyst and stirring speed
Revue Roumaine De Chimie, 2003Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Gheorghe Dehelean, Adriana Popa, Lavinia Macarie, Liliana PacureanuAbstract:The paper investigates the effect of the reaction temperature, reagents molar-ratio, phase-transfer catalyst and stirring on the yield and inherent viscosity of polyphosphonate (PCP) obtained by liquid-liquid Interfacial Polycondensation of cyclohexylphosphonic dichloride (CPD) with bisphenol A (BA). The best results were obtained for temperatures between -5+5°C, molar ratio CPD : BA = 2.0 : 1.0, using tetrabutylammonium bromide as phase-transfer catalyst and high stirring speed.
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polyphosphonates obtained by vapor liquid Interfacial Polycondensation
Polymer Bulletin, 2002Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Gheorghe Dehelean, Adriana PopaAbstract:A series of polyphosphonates were synthesized by base promoted liquid-vapor Interfacial Polycondensation of various alkyl (aryl) phosphonic dichlorides (methylphosphonic dichloride (MPD), cyclohexylphosphonic dichloride (CPD) and phenylphosphonic dichloride (PPD)) with different bisphenols (hydroquinone (HQ), bisphenol A (BA), 4,4′ - biphenol (BP), 1,5-naphtalenediol (ND) and 4,4′ - sulfonyldiphenol (SD)). The polyphosphonates were characterized by infrared (IR) and proton magnetic resonance (1H-NMR) spectroscopy. Yields in the range of 20–80% and Mn of ∼ 8500–35000 were obtained. DSC measurements show Tg in the range 95°–148°C. These polymers are soluble in solvents such as N,N-dimethylformamide, tetrahydrofuran and chloroform. Polyphosphonates were stable up 240°–300°C in air atmosphere.
Sunil S. Dhumal - One of the best experts on this subject based on the ideXlab platform.
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Understanding Interfacial Polycondensation: Experiments on polyurea system and comparison with theory
Polymer, 2010Co-Authors: Sunil S. Dhumal, Akkihebbal K. SureshAbstract:Abstract Interfacial Polycondensation, with its multiphase character and the involvement of several rate and equilibrium processes, presents unique challenges to our ability to understand and design processes for achieving desired properties. In a recent study [1] , we have presented a detailed model for the process and shown that it explains the salient features as reported in the literature for several Interfacial systems. In the present paper, we report extensive experimental studies on the polyurea system and their comparison with the model. Two geometries – the spherical geometry of the microcapsule and the flat-film geometry – have been used to study qualitative and quantitative features of the Polycondensation and the nature of the film that forms. While some aspects, such as the manner in which the solvent influences the kinetics, confirm earlier findings, inadequacies have been identified in the sample preparation protocols followed in earlier work, because of which property estimations may carry a large error. Improved protocols have accordingly been developed and used to study the development of film properties in time and as a function of the important preparation variables. Detailed molecular weight distributions have been determined using a GPC technique and used to derive important properties of the polyurea (such as Mark–Houwink parameters) as well as to gain insights into mechanisms. The data have been used to determine the rate parameters in the Dhumal and Suresh [1] model. The predictions of the model, as far as trends are concerned, are shown to be satisfactory given the level of uncertainty about parameter values and the complexity of the system being studied. Where discrepancies exist, the reasons have been established and the areas for improvement of the model identified. The findings reported are of interest to applications such as controlled release and membrane separations, in which permeation rate through the membrane is of importance and depends upon various membrane properties like crystallinity, morphology, etc.
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a comprehensive model for kinetics and development of film structure in Interfacial Polycondensation
Polymer, 2009Co-Authors: Sunil S. Dhumal, A K SureshAbstract:A detailed model for Interfacial Polycondensation (IP) reaction, which accounts for the salient equilibrium and rate processes in reaction and phase separation, is reported here. The modeling of nucleation phenomena is more rational and fundamentally based than so far attempted in the literature on this process. Simpler models are proposed for situations in which one of transport and reaction resistances is the dominant one, and criteria developed that guide the selection of the model. The model explains the empirical findings on different Interfacial systems, which have been reported in the literature. An extensive parametric study has been carried out in order to explain the effect of the important dimensionless parameters that arise, and analysis shows that most of the effects observed can be rationalized with respect to certain types of asymptotic behavior. The model makes it possible to predict the time course of development of the important film properties such as thickness, MWD and crystallinity, and to relate these to the preparation conditions and system parameters, as embodied in the different dimensionless parameters. It should therefore be possible to use this model to choose synthesis conditions and system-dependent parameters to achieve desired properties.
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an experimental study of polyurea membrane formation by Interfacial Polycondensation
Journal of Membrane Science, 2009Co-Authors: S.j. Wagh, Sunil S. Dhumal, A K SureshAbstract:Interfacial Polycondensation has been studied for many applications, and most importantly for such niche applications such as microencapsulation and membrane synthesis. The fast kinetics and the complexity of the process involving the interplay of several rate and equilibrium processes make it difficult to study the reaction and explore the effect of kinetics on the properties of the polymer film that forms. We show in this study that a dispersed phase configuration such as used in microencapsulation, with a fast on-line pH measurement, is a convenient way to study these reactions. Apart from the ease of obtaining kinetic information, the technique results in self-supporting films which can be recovered and characterized for structure by a variety of techniques. In this study, the intrinsic variables which influence observed reaction velocities, such as reactant concentrations and film thickness, have been varied through experimental parameters that can be more conveniently set. Although the intrinsic kinetics is fast, it is still possible that intrinsic chemical kinetics play a significant role in the overall mechanism, since the films formed are very thin. Data obtained under such conditions, with an excess of the organic-side monomer (hexamethylene-1,6-diisocyanate, HMDI), show a first order dependence of monomer consumption rate on the aqueous-side monomer (hexamethylene-1,6-diamine, HMDA). The effect of solvent on the observed rates shows some interesting characteristics, counterintuitive if a correlation is sought with the partition coefficient of HMDA into the solvent. It is shown that rates correlate better with solvent polarity. The polymer formed is of low molecular weight in general. The molecular weight shows a dependence on the mole ratio of monomers, with a ratio (HMDI/HMDA) slightly in excess of 1 being the most conducive to molecular weight development. The polymer is of semicrystalline structure, with the crystallinity determined by the conditions of reaction. These findings are of interest to applications such as controlled release and membrane separations, in which permeation rate through the membrane is of importance.
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Interfacial Polycondensation—Modeling of kinetics and film properties
Journal of Membrane Science, 2008Co-Authors: Sunil S. Dhumal, Shrikant J. Wagh, Akkihebbal K. SureshAbstract:Interfacial Polycondensation (IP) is an important technique used in the encapsulation of a variety of active ingredients and synthesis of thin film composite membranes. The present work seeks to advance our understanding of the mechanisms underlying the reaction, phase separation and film formation in this process, and hence, of how the film properties are influenced by preparation conditions. The model presented here incorporates all the essential physicochemical processes at a fundamental level through simple phenomenologies: ionic equilibria in the aqueous phase, resistances due to external mass transfer, diffusion through polymer film, Interfacial reaction, thermodynamics of phase separation, and formation of a coherent film. The model has been tested against the data previously communicated [S.J. Wagh, Studies in Interfacial Polycondensation. Ph.D. Thesis. IIT Bombay, 2004; S.J. Wagh, S.S. Dhumal, A.K. Suresh, An experimental study of polyurea membrane formation by Interfacial Polycondensation, Journal of Membrane Science, submitted for publication] on polyurea microcapsules. The influence of the model parameters and preparation conditions, on the properties of the polymer and film and their development during reaction, have been studied. The study provides important insights into the process and should help in designing synthesis methodologies to suit the application.© Elsevie
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Interfacial Polycondensation modeling of kinetics and film properties
Journal of Membrane Science, 2008Co-Authors: Sunil S. Dhumal, Shrikant J. Wagh, Akkihebbal K. SureshAbstract:Interfacial Polycondensation (IP) is an important technique used in the encapsulation of a variety of active ingredients and synthesis of thin film composite membranes. The present work seeks to advance our understanding of the mechanisms underlying the reaction, phase separation and film formation in this process, and hence, of how the film properties are influenced by preparation conditions. The model presented here incorporates all the essential physicochemical processes at a fundamental level through simple phenomenologies: ionic equilibria in the aqueous phase, resistances due to external mass transfer, diffusion through polymer film, Interfacial reaction, thermodynamics of phase separation, and formation of a coherent film. The model has been tested against the data previously communicated [S.J. Wagh, Studies in Interfacial Polycondensation. Ph.D. Thesis. IIT Bombay, 2004; S.J. Wagh, S.S. Dhumal, A.K. Suresh, An experimental study of polyurea membrane formation by Interfacial Polycondensation, Journal of Membrane Science, submitted for publication] on polyurea microcapsules. The influence of the model parameters and preparation conditions, on the properties of the polymer and film and their development during reaction, have been studied. The study provides important insights into the process and should help in designing synthesis methodologies to suit the application.
Adriana Popa - One of the best experts on this subject based on the ideXlab platform.
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Interfacial Polycondensation method used in the synthesis of polymers containing phosphorus in the main chain
Pure and Applied Chemistry, 2014Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Adriana Popa, Nicoleta Plesu, Lavinia Macarie, Corneliu Mircea DavidescuAbstract:Abstract Polyphosphoesters gained importance especially due to their use as flame retardants and as biocompatible and biodegradable materials for medicine and in the pharmaceutical industry. This paper presents the results obtained by our research group in the synthesis of polyphosphoesters by Interfacial Polycondensation. This reaction is rapid and irreversible polymerization at the interface between a phase containing one difunctional intermediate and another phase containing a complementary difunctional reactant. Different methods like liquid–liquid, vapor–liquid or solid<uni-2013;liquid were used in the synthesis of polyphosphates of polyphosphonates using aliphatic/aromatic phosphoric/phosphonic dichlorides and different diols. Aqueous NaOH, or tripotasium phosphate were used as bases. In almost all cases a catalyst is not needed.
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Optimization of synthesis parameters in Interfacial Polycondensation using design of experiments
Polymer Bulletin, 2009Co-Authors: Smaranda Iliescu, Adriana Popa, Ion Grozav, Simona Funar-timofei, Nicoleta Plesu, Gheorghe IliaAbstract:The reaction of phenylphosphonic dichloride with 4,4′-cyclohexylidenebisphenol by a gas–liquid Interfacial Polycondensation was investigated. The design of experiments (DoE) method is used for determination of the best reaction conditions. The correlation of simultaneous influence of the parameters (reaction time, reaction temperature, alkaline medium, reagents molar ratio) on yield and inherent viscosity was studied.
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The synthesis of biodegradable poly(phosphate esters) by vapor-liquid Interfacial Polycondensation
Revue Roumaine De Chimie, 2005Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Adriana Popa, Nicoleta PlesuAbstract:This paper investigates the synthesis of polyphosphates by vapor-liquid Interfacial Polycondensation of phenyphosphoric dichloride (PPD) with different diphenols: bisphenol A(BA), 4,4'-sulfonyldiphenol (SDP) and 4,4'-biphenol (BP). The polyphosphates were characterized by IR, 1 H-NMR spectroscopy, gel permeation chromatography. The thermal stability of these polymers was evaluated by thermogravimetry.
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Study of the liquid-liquid Interfacial Polycondensation of cyclohexylphosphonic dichloride with bisphenol A. 31 Influence of the reaction temperature, reagents molar-ratio, phase-transfer catalyst and stirring speed
Revue Roumaine De Chimie, 2003Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Gheorghe Dehelean, Adriana Popa, Lavinia Macarie, Liliana PacureanuAbstract:The paper investigates the effect of the reaction temperature, reagents molar-ratio, phase-transfer catalyst and stirring on the yield and inherent viscosity of polyphosphonate (PCP) obtained by liquid-liquid Interfacial Polycondensation of cyclohexylphosphonic dichloride (CPD) with bisphenol A (BA). The best results were obtained for temperatures between -5+5°C, molar ratio CPD : BA = 2.0 : 1.0, using tetrabutylammonium bromide as phase-transfer catalyst and high stirring speed.
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polyphosphonates obtained by vapor liquid Interfacial Polycondensation
Polymer Bulletin, 2002Co-Authors: Smaranda Iliescu, Gheorghe Ilia, Gheorghe Dehelean, Adriana PopaAbstract:A series of polyphosphonates were synthesized by base promoted liquid-vapor Interfacial Polycondensation of various alkyl (aryl) phosphonic dichlorides (methylphosphonic dichloride (MPD), cyclohexylphosphonic dichloride (CPD) and phenylphosphonic dichloride (PPD)) with different bisphenols (hydroquinone (HQ), bisphenol A (BA), 4,4′ - biphenol (BP), 1,5-naphtalenediol (ND) and 4,4′ - sulfonyldiphenol (SD)). The polyphosphonates were characterized by infrared (IR) and proton magnetic resonance (1H-NMR) spectroscopy. Yields in the range of 20–80% and Mn of ∼ 8500–35000 were obtained. DSC measurements show Tg in the range 95°–148°C. These polymers are soluble in solvents such as N,N-dimethylformamide, tetrahydrofuran and chloroform. Polyphosphonates were stable up 240°–300°C in air atmosphere.