scholarly journals Generalized Pitzer Correlation for Density Calculations of Ionic Liquids

2021 ◽  
Vol 21 (1) ◽  
pp. 38
Author(s):  
Jesus Patrick Nuqui ◽  
Regina Damalerio ◽  
Sychheng Meas ◽  
Socheata Yem ◽  
Allan Soriano
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Virial Coefficients ◽  
Correlation Equation ◽  
Pressure Effects ◽  
Acentric Factor ◽  
Absolute Deviation ◽  
Reduced Pressure ◽  
Calculated Density ◽  
Coefficient Corrélation

The density of ionic liquids is an important design parameter for its utilization as a chemical process solvent. In this study, a generalized Pitzer-type correlation for calculating the density of ionic liquids with the use of reduced temperature (TR), reduced pressure (PR), and acentric factor (ω) as parameters is proposed. Experimental density data were obtained from several references through the IUPAC Ionic Liquids Database. Expansion of the terms as well as integrating the ionic liquid molecular weight was attempted to determine the accuracy improvement of the model in predicting densities at 0.1 MPa. Then, the obtained model was modified by further truncation to include the pressure effects for densities at higher pressures. MATLAB software was used to determine the optimal virial coefficients for the proposed correlations. The percent average absolute deviation (%AAD) was applied to calculate the variation between the experimental and calculated density values. It was concluded that the eight (8) coefficient correlation equation with molecular weight for densities at 0.1 MPa had a %AAD of 4.7537%. Upon modifying the correlation to include pressure effects, the resulting modified equation had an overall %AAD of 4.7174%.

Effect of Molecular Weight on the Ion Transport Mechanism in Polymerized Ionic Liquids

2016 ◽  
Vol 49 (12) ◽  
pp. 4557-4570 ◽  
Author(s):  
Fei Fan ◽  
Weiyu Wang ◽  
Adam P. Holt ◽  
Hongbo Feng ◽  
David Uhrig ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Ion Transport ◽  
Transport Mechanism

Tailoring Molecular Weight of Bioderived Polycarbonates via Bifunctional Ionic Liquids Catalysts under Metal-Free Conditions

2018 ◽  
Vol 6 (2) ◽  
pp. 2684-2693 ◽  
Author(s):  
Congkai Ma ◽  
Fei Xu ◽  
Weiguo Cheng ◽  
Xin Tan ◽  
Qian Su ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Metal Free

Application of novel ionic liquids for reverse atom transfer radical polymerization of methacrylonitrile without any additional ligand

2009 ◽  
Vol 24 (5) ◽  
pp. 1880-1885 ◽  
Author(s):  
Hou Chen ◽  
Yanfeng Meng ◽  
Ying Liang ◽  
Zixuan Lu ◽  
Pingli Lv
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Reaction Rate ◽  
Atom Transfer ◽  
Additional Ligand ◽  
Rapid Reaction ◽  
Living Nature ◽  
First Time

Reverse atom transfer radical polymerization of methacrylonitrile (MAN) initiated by azobisisobutyronitrile (AIBN) was approached for the first time in the absence of any ligand in four novel ionic liquids, 1-methylimidazolium acetate ([mim][AT]), 1-methylimidazolium butyrate ([mim][BT]), 1-methylimidazolium caproate ([mim][CT]), and 1-methylimidazolium heptylate ([mim][HT]). The polymerization in [mim][AT] not only showed the best control of molecular weight and its distribution but also provided a more rapid reaction rate with the ratio of [MAN]:[FeCl3]:[AIBN] at 300:2:1. The block copolymer PMAN-b-PSt was obtained via a conventional ATRP process in [mim][AT] by using the resulting PMAN as a macroinitiator. After simple purification, [mim][AT] and FeCl3 could be easily recycled and reused and had no effect on the living nature of reverse atom transfer radical polymerization of MAN.

ChemInform Abstract: Gelation of Ionic Liquids with a Low Molecular-Weight Gelator Showing Tgel Above 100 °C.

ChemInform ◽  
2010 ◽  
Vol 33 (13) ◽  
pp. no-no
Author(s):  
Atsushi Ikeda ◽  
Kenshi Sonoda ◽  
Masatsugu Ayabe ◽  
Shun-ichi Tamaru ◽  
Takuya Nakashima ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquids ◽  
Low Molecular Weight ◽  
Low Molecular Weight Gelator

Solution Properties of Polybutadiene and trans-Polyisoprene Fractions

1963 ◽  
Vol 36 (2) ◽  
pp. 488-501
Author(s):  
W. Cooper ◽  
D. E. Eaves ◽  
G. Vaughan
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Benzene Solution ◽  
Second Virial Coefficient ◽  
Virial Coefficients ◽  
Γ Radiation ◽  
Branched Polymer ◽  
Butyl Lithium ◽  
Second Virial Coefficients ◽  
Molecular Weights

Abstract Linear polybutadienes, prepared with butyl lithium as catalyst, and polybutadienes branched by exposure to γ-radiation have been fractionated and the fractions examined by osmometry and light scattering. Turbidimetric second virial coefficients (A2τ) of mixed polymer fractions are virtually the same as those of the higher molecular weight components of the mixtures for most compositions. This is true both for mixtures of linear with linear and linear with branched polymer. The higher the molecular weight of the fraction, the greater the effect; the addition of 1 per cent microgel to a linear polymer reduced A2τ by a factor of three. The presence of microgel or high molecular weight branched polymer has been shown to be responsible for the very high molecular weights previously reported for polybutadienes from light scattering measurements. It is conveniently removed by shaking the solutions with calcium sulfate. Second virial coefficients obtained either by light scattering or osmometry are, within the limits of experimental error, uninfluenced by branching in the polymer. In general those factors which lead to increased branching also result in increased polydispersity, and it is the latter which results in the decrease in A2τ. The fall of the osmotic second virial coefficient (A2τ) with molecular weight is much smaller than would be calculated theoretically, and the fall in A2τ is greater than would be expected, notwithstanding the fact that for some of the fractions Mw/Mn<1.1. This indicates that A2τ is sensitive to the low molecular weight species present in the fractions, whereas the reverse must apply to A2τ. Natural or synthetic trans-polyisoprene showed analogous behavior to polybutadiene, although, owing to experimental difficulties, sharp branched fractions could not be obtained. The following viscosity-molecular weight relationships were obtained in benzene solution: [η]=1.45×10−4M0.76 for butyl lithium-catalyzed polybutadienes, and [η]=4.37×10−4M0.65 for natural and synthetic trans-polyisoprenes.

scholarly journals Glycol-functionalized ionic liquids for high-temperature enzymatic ring-opening polymerization

RSC Advances ◽  
2018 ◽  
Vol 8 (63) ◽  
pp. 36025-36033 ◽  
Author(s):  
Hua Zhao ◽  
Lennox O. Afriyie ◽  
Nathaniel E. Larm ◽  
Gary A. Baker
Keyword(s):  
Thermal Stability ◽  
Molecular Weight ◽  
Ionic Liquids ◽  
High Temperature ◽  
High Molecular Weight ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
High Thermal Stability ◽  
Polymerization Reaction

New glycol-functionalized ionic liquids exhibit high thermal stability and are lipase-compatible, leading to a high molecular weight of polyester in the enzymatic ring-opening polymerization reaction.

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