Excess molar enthalpies of mixtures of methyl derivatives of polyethylene glycol with 1-alkanol at 298.15 K and 101.3 kPa

2002 ◽  
Vol 80 (5) ◽  
pp. 462-466 ◽  
Author(s):  
M EF de Ruiz Holgado ◽  
J Fernandez ◽  
M I Paz Andrade ◽  
E L Arancibia
Keyword(s):  
Polyethylene Glycol ◽  
Atmospheric Pressure ◽  
Excess Enthalpy ◽  
Monomethyl Ether ◽  
Excess Molar Enthalpies ◽  
Tetraethylene Glycol ◽  
Calvet Microcalorimeter ◽  
Methyl Derivatives ◽  
Experimental Values ◽  
Derivatives Of

Excess molar enthalpies (H E) of the binary mixtures containing tetraethylene glycol dimethyl ether (TEGDME) or polyethylene glycol 350 monomethyl ether with a 1-alkanol (1-propanol, 1-butanol, or 1-pentanol) at 298.15 K and atmospheric pressure were measured using a Calvet microcalorimeter. All the H E experimental values were positive and increase as the 1-alkanol length increases. The results are discussed qualitatively in terms of molecular interactions. The UNIFAC and DISQUAC group contribution models have been used to compare the predicted and the experimental values.Key words: excess enthalpy, 1-alkanol, polyether, binary system.

Calculation of thermodynamic functions of halogen derivatives of silane and germane

1984 ◽  
Vol 49 (5) ◽  
pp. 1211-1227 ◽  
Author(s):  
Michal Bureš ◽  
Čestmír Černý
Keyword(s):  
Thermodynamic Functions ◽  
Atmospheric Pressure ◽  
Ideal Gas ◽  
Critical Examination ◽  
Rigid Rotator ◽  
Relative Enthalpy ◽  
Harmonic Oscillator Approximation ◽  
Experimental Values ◽  
Derivatives Of ◽  
The Ideal

Molar heat capacity, absolute entropy, relative enthalpy and relative Gibbs energy were calculated for all halogen derivatives of silane and germane. The calculation was performed for the ideal gas state at atmospheric pressure in the temperature range 100 to 1 500 K in the usual rigid rotator - harmonic oscillator approximation. In the case of molecules where the necessary experimental values of fundamental vibrational frequencies were missing, the calculation was performed using the predicted frequencies. On the basis of the values of molar heat capacities obtained in both these ways, a critical examination of the influence of the inaccuracy of the predicted vibration frequencies on the accuracy of calculated ideal gas thermodynamic functions was made.

Physical Properties of TCNQ Salts with N-Methyl Derivatives of Pyridine

1982 ◽  
Vol 85 (1) ◽  
pp. 257-263 ◽  
Author(s):  
A. Graja ◽  
M. Przybylski ◽  
B. Butka ◽  
R. Swietlik
Keyword(s):  
Physical Properties ◽  
Methyl Derivatives ◽  
Derivatives Of

Effect of substitution of halogen or N3-methyl derivatives of uridine for uridine in trinucleotide codons on their recognition by aminoacyl-[14C]-tRNA

1968 ◽  
Vol 33 (11) ◽  
pp. 3858-3865 ◽  
Author(s):  
D. Grünberger ◽  
A. Holý ◽  
J. Smrt ◽  
F. Šorm
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of

Methyl derivatives of furan

1974 ◽  
Vol 39 (11) ◽  
pp. 3109-3116 ◽  
Author(s):  
J. Šrogl ◽  
M. Janda ◽  
I. Stibor ◽  
V. Skála ◽  
P. Trška ◽  
...  
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of

Preparation of Electrospun Fibers of Polyethylene Glycol Monomethyl Ether-Co-Polyaniline Blended with Polycaprolactone: Effect of Low Molecular Weight Copolymer on Obtained Fibers

2014 ◽  
Vol 53 (3) ◽  
pp. 254-261 ◽  
Author(s):  
Leyla Shadi ◽  
Mohammad Karimi ◽  
Karim Asadpour-Zeynali ◽  
Ali Akbar Entezami ◽  
Kazem Dindar Safa
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Monomethyl Ether ◽  
Electrospun Fibers ◽  
Low Molecular Weight ◽  
Glycol Monomethyl Ether

O'-Methyl derivatives of arabinosylcytosine

1972 ◽  
Vol 46 (4) ◽  
pp. 1734-1741 ◽  
Author(s):  
E. Darżynkiewicz ◽  
J.T. Kuśmierek ◽  
D. Shugar
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of

The combined effect of lattice’s uniaxial strains and electron–phonon interaction’s screening on TBEC of the intersite bipolarons

2016 ◽  
Vol 30 (26) ◽  
pp. 1650186
Author(s):  
B. Yavidov ◽  
SH. Djumanov ◽  
T. Saparbaev ◽  
O. Ganiyev ◽  
S. Zholdassova ◽  
...  
Keyword(s):  
Ideal Gas ◽  
Einstein Condensation ◽  
Chain Model ◽  
One Dimensional ◽  
Electron Phonon Interaction ◽  
Model Lattice ◽  
Experimental Values ◽  
Bose Einstein ◽  
Derivatives Of ◽  
The Ideal

Having accepted a more generalized form for density-displacement type electron–phonon interaction (EPI) force we studied the simultaneous effect of uniaxial strains and EPI’s screening on the temperature of Bose–Einstein condensation [Formula: see text] of the ideal gas of intersite bipolarons. [Formula: see text] of the ideal gas of intersite bipolarons is calculated as a function of both strain and screening radius for a one-dimensional chain model of cuprates within the framework of Extended Holstein–Hubbard model. It is shown that the chain model lattice comprises the essential features of cuprates regarding of strain and screening effects on transition temperature [Formula: see text] of superconductivity. The obtained values of strain derivatives of [Formula: see text] [Formula: see text] are in qualitative agreement with the experimental values of [Formula: see text] [Formula: see text] of La[Formula: see text]Sr[Formula: see text]CuO4 under moderate screening regimes.

The synthesis of O-methyl derivatives of 4-thiopentofuranosides and 2,5-anhydropentoses

1976 ◽  
Vol 46 (2) ◽  
pp. 237-244 ◽  
Author(s):  
Theodorus van Es
Keyword(s):  
Methyl Derivatives ◽  
Derivatives Of
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