Thermal and Rheological Studies of Aqueous Solutions of PEG 400 and PEG 1500 Having Pharmaceutical Applications

Padmanaban, R.; Venkatramanan, K.; Girivel, S.; Kasthuri, K.; Usharani, A.; Vellaichamy, Roy

doi:10.1007/978-3-319-44890-9_58

Cited by 7 publications

(8 citation statements)

References 7 publications

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“…Table 1 that decrease in adiabatic compressibility, and as well as in intermolecular free length is observed in all the two systems, with the increasing concentration of Polystyrene. This trend indicates the formation of strong hydrogen bonding between polymer and solvent molecules [3]. A reverse trend of viscosity with free volume is observed in both cases.…”

Section: Molecular Interaction Studiesmentioning

confidence: 70%

“…2). The reason for this behavior may be due to the development of large frictional force between the layers of the solution [3]. Arrhenius expression [1] is valid for pure solvents and also for dilute polymer solutions.…”

Section: Activation Energy Studiesmentioning

confidence: 99%

“…As the concentration of polyethylene glycol increases the internal pressure of the system also increases. This increase in the internal pressure of the polymer may be due the presence of strong attractive force between the polymer and solvent molecules [3]. The increase in viscous relaxation indicates that viscous forces play a dominant role in the relaxation process.…”

Section: Molecular Interaction Studiesmentioning

confidence: 99%

“…Acoustical and molecular interaction studies in polymer solutions have been the subject of research in recent years [1][2][3][4]. Ultrasonic and viscometry is the universally accepted technique to study the physical, chemical and thermodynamic properties of the polymeric solutions, liquids, liquid mixtures and electrolytic solutions and polymeric solutions [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…In the present work, density, viscosity, ultrasonic velocity and related thermodynamic and molecular interaction properties have been determined and the solute-solvent interactions for Polystyrene in toluene and 1,4-Dioxane at different concentrations have been studied at constant frequency (2MHz) at 303K. Measurement of ultrasonic velocity [1][2][3][4] has been effectively employed in understanding the molecular interaction properties in polymer solution.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Study on the Acoustic and Rheological Properties of Polystyrene in Different Solvents

Padmanaban¹,

Venkatramanan²,

Arumugam³

2018

IJCRR

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Polystyrene (PS) is a synthetic aromatic hydrocarbon polymer prepared from the monomer styrene. Polystyrene can be foamed or solid. General-purpose polystyrene is hard, clear and rather brittle. It is a low cast resin per unit weight. It is a rather poor barrier to oxygen and water vapour and has a relatively low melting point. Polystyrene is one of the most widely used plastics, the scale of its production being several million tonnes per year. Polystyrene can be naturally transparent, but can be coloured with colourants. Uses include protective packaging (such as packing peanuts and DVD and CD cases), bottles, trays, containers, lids, tumblers, disposable cutlery and in the making of models. In the present study an attempt has been made to compute the viscosity of Polystyrene (M.W: 35000) in toluene and 1,4-Dioxane at different concentrations (0.2%, 0.4%, 0.6%, 0.8% & 1.0%) at different temperatures (303 K, 308 K, 313 K & 318 K). From these experimental data, activation energy is calculated and the effect of solvent is analyzed. Density and ultrasonic velocity have been estimated for the above systems at 303K. From these experimental values, various molecular interaction parameters like free volume, internal pressure, viscous relaxation time, interatomic free length, etc. are calculated and discussed in terms of solute-solvent interactions.

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Section: Molecular Interaction Studiesmentioning

confidence: 70%

Section: Activation Energy Studiesmentioning

confidence: 99%

Section: Molecular Interaction Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Study on the Acoustic and Rheological Properties of Polystyrene in Different Solvents

Padmanaban¹,

Venkatramanan²,

Arumugam³

2018

IJCRR

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Effect of self-curing admixture on concrete properties in hot climate conditions

Rizzuto

Kamal

Elsayad

et al. 2020

Construction and Building Materials

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Highlights• PEG 400 admixture was used in concrete mixes produced for hot weather conditions • Dry materials, mixing water and curing temperatures simulated hot weather • Properties of PEG samples were found to be superior to the control concrete • Results cannot to attributed only to prevention of pore water escape by PEG 400 • A proposal was made to explain the results based on information from the literature ABSTRACT Hot climates prevail in many regions of the globe. The average summer temperature of hot arid areas is in the range of 40-50°C with temperatures exceeding these values under direct solar radiation. Curing concrete in these regions may be challenging due to limited availability of suitable water for curing and/or rapid loss of curing water by evaporation. For many years self-curing admixtures were recommended as an alternative to water curing, however, limited studies have been conducted on their performance in hot weather conditions. In this investigation, the effects of a hot climate on the fresh and hardened properties of self-curing (SC) concrete and normal conventional concrete (NC) in hot weather were studied. A watersoluble polymer self-curing agent, polyethylene glycol (PEG 400), was added to the SC mixes. The testing parameters were concrete dry materials (25 or 50 O C) and/or mix water temperatures (5, 20 or 35 O C) at the time of mixing. NC samples were continuously water cured at 25 or 50 O C, whereas the SC ones were air cured at the same temperatures. The tested properties were workability, compressive strength, splitting tensile strength, and flexural strength. It was found that SC outperformed NC under varying conditions. The results could not be simply attributed to the retention of mix water by the self-curing admixture. A more comprehensive explanation for the observations is proposed.

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An overview of the experimental techniques for characterization of laser-welded metal joints

Jayanthi

Venkataramanan

Kumar³

2021

Materials Today: Proceedings

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Thermal and Rheological Studies of Aqueous Solutions of PEG 400 and PEG 1500 Having Pharmaceutical Applications

Cited by 7 publications

References 7 publications

A Study on the Acoustic and Rheological Properties of Polystyrene in Different Solvents

A Study on the Acoustic and Rheological Properties of Polystyrene in Different Solvents

Effect of self-curing admixture on concrete properties in hot climate conditions

An overview of the experimental techniques for characterization of laser-welded metal joints

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