scholarly journals Preparation of protic ionic liquids containing cyclic oligosiloxane frameworks

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10575-10582 ◽  
Author(s):  
T. Hirohara ◽  
T. Kai ◽  
J. Ohshita ◽  
Y. Kaneko
Keyword(s):  
Ionic Liquids ◽  
Protic Ionic Liquids ◽  
Thermal Stabilities ◽  
Hydrolytic Condensation ◽  
Condensation Method

Protic ionic liquids containing cyclic oligosiloxane frameworks, which were prepared by the hydrolytic condensation method, exhibited relatively high thermal stabilities.

scholarly journals Control of Crystalline-Amorphous Structures of Polyhedral Oligomeric Silsesquioxanes Containing Two Types of Ammonium Side-Chain Groups and Their Properties as Protic Ionic Liquids

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4553 ◽  
Author(s):  
Ryoya Hasebe ◽  
Yoshiro Kaneko
Keyword(s):  
Ionic Liquids ◽  
Side Chain ◽  
Methyl Groups ◽  
29Si Nmr ◽  
Side Chains ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Ammonium Ions ◽  
Protic Ionic Liquids ◽  
Hydrolytic Condensation ◽  
Amorphous Structures

Polyhedral oligomeric silsesquioxanes (POSSs), Am-POSS(x,y), prepared by hydrolytic condensation, contains two types of ammonium side-chain groups, where the numbering of x and y represents the type of ammonium ions in the POSS structure, corresponding to primary (1), secondary (2), tertiary (3), and quaternary (4) ammonium ions. Mixtures of the two starting materials selected from organotrialkoxysilanes containing primary, secondary, and tertiary amines and a quaternary ammonium salt [(RO)3Si(CH2)3R′, R = CH3 or CH2CH3, R′ = NH2, NHCH3, N(CH3)2, and N(CH3)3Cl] were dissolved in dimethyl sulfoxide (DMSO). The hydrolytic condensation was performed in the presence of bis(trifluoromethansulfonyl)imide (HNTf2) and water. All Am-POSS(x,y) structures consisted of a cage-type octamer (T8-POSS), as confirmed by 29Si NMR spectrometry and matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS). Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) analyses indicated that Am-POSS(1,3), Am-POSS(1,4), and Am-POSS(2,4) had amorphous structures. These POSSs have two or three differences in the number of methyl groups between the two types of ammonium side-chains. Conversely, Am-POSS(1,2), Am-POSS(2,3), and Am-POSS(3,4) had crystalline structures. The difference in the number of methyl groups between the two types of ammonium side-chains in these POSSs is only one. Therefore, the crystalline-amorphous structure of Am-POSS(x,y) is controlled by the side-chain group combinations. Furthermore, Am-POSS(1,3), Am-POSS(1,4), and Am-POSS(2,4) are protic ionic liquids with relatively low flow temperatures.

DFT Study on the Chemical Absorption Mechanism of CO2 in Diamino Protic Ionic Liquids

2021 ◽  
Vol 125 (5) ◽  
pp. 1416-1428
Author(s):  
Jing Ma ◽  
Yutong Wang ◽  
Xueqing Yang ◽  
Mingxuan Zhu ◽  
Baohe Wang
Keyword(s):  
Ionic Liquids ◽  
Dft Study ◽  
Protic Ionic Liquids ◽  
Absorption Mechanism ◽  
Chemical Absorption

scholarly journals The Synthesis of Poly(Vinyl Alcohol) Grafted with Fluorinated Protic Ionic Liquids Containing Sulfo Functional Groups

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4158
Author(s):  
Patrycja Glińska ◽  
Andrzej Wolan ◽  
Wojciech Kujawski ◽  
Edyta Rynkowska ◽  
Joanna Kujawa
Keyword(s):  
Ionic Liquids ◽  
Vinyl Alcohol ◽  
Proton Exchange ◽  
Polymer Materials ◽  
Polymerization Reaction ◽  
Poly Vinyl Alcohol ◽  
Hydroxyl Groups ◽  
Protic Ionic Liquids ◽  
Synthesis Route ◽  
Sulfo Groups

There has been an ongoing need to develop polymer materials with increased performance as proton exchange membranes (PEMs) for middle- and high-temperature fuel cells. Poly(vinyl alcohol) (PVA) is a highly hydrophilic and chemically stable polymer bearing hydroxyl groups, which can be further altered. Protic ionic liquids (proticILs) have been found to be an effective modifying polymer agent used as a proton carrier providing PEMs’ desirable proton conductivity at high temperatures and under anhydrous conditions. In this study, the novel synthesis route of PVA grafted with fluorinated protic ionic liquids bearing sulfo groups (–SO3H) was elaborated. The polymer functionalization with fluorinated proticILs was achieved by the following approaches: (i) the PVA acylation and subsequent reaction with fluorinated sultones and (ii) free-radical polymerization reaction of vinyl acetate derivatives modified with 1-methylimidazole and sultones. These modifications resulted in the PVA being chemically modified with ionic liquids of protic character. The successfully grafted PVA has been characterized using 1H, 19F, and 13C-NMR and FTIR-ATR. The presented synthesis route is a novel approach to PVA functionalization with imidazole-based fluorinated ionic liquids with sulfo groups.

Development of a robust soft-SAFT model for protic ionic liquids using new high-pressure density data

2021 ◽  
pp. 113036
Author(s):  
Emanuel A. Crespo ◽  
Liliana P. Silva ◽  
Cristina I.P. Correia ◽  
Mónia A.R. Martins ◽  
Ramesh L. Gardas ◽  
...  
Keyword(s):  
High Pressure ◽  
Ionic Liquids ◽  
Protic Ionic Liquids ◽  
Density Data

Insights into the translational and rotational dynamics of cations and anions in protic ionic liquids by means of NMR fast-field-cycling relaxometry

2021 ◽  
Vol 23 (4) ◽  
pp. 2663-2675
Author(s):  
Viviane Overbeck ◽  
Henning Schröder ◽  
Anne-Marie Bonsa ◽  
Klaus Neymeyr ◽  
Ralf Ludwig
Keyword(s):  
Ionic Liquids ◽  
Rotational Dynamics ◽  
Protic Ionic Liquids ◽  
Field Cycling ◽  
Fast Field ◽  
Hydrogen Bonded

NMR Fast-Field-Cycling (FFC) relaxometry provides important information about translational and rotational dynamics of hydrogen bonded protic ionic liquids (PILs). 

Highly efficient CO2 fixation into cyclic carbonate by hydroxyl-functionalized protic ionic liquids at atmospheric pressure

2021 ◽  
Vol 511 ◽  
pp. 111756
Author(s):  
Cheng Li ◽  
Fei Liu ◽  
Tianxiang Zhao ◽  
Jiarui Gu ◽  
Peng Chen ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Atmospheric Pressure ◽  
Co2 Fixation ◽  
Cyclic Carbonate ◽  
Protic Ionic Liquids ◽  
Highly Efficient

scholarly journals Protic Ionic Liquids as Reagent, Catalyst, and Solvent: Triple Role of 1‐Methylimidazolium Thiocyanate

2021 ◽  
Author(s):  
Daniel B. Werz ◽  
Ivan A. Andreev ◽  
Nina K. Ratmanova ◽  
André U. Augustin ◽  
Olga A. Ivanova ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Protic Ionic Liquids
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