Open AccessSynthesis and characterization of thermo-responsive ionic liquids (TRILs)
Author(s) -
Mohd Amirul Mukmin Abdullah,
Muhammad Suhaimi Man,
Shardy Abdullah,
Syed M. Saufi
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/736/4/042027
Subject(s) - upper critical solution temperature , ionic liquid , lower critical solution temperature , miscibility , phosphonium , pyridinium , alkyl , fourier transform infrared spectroscopy , phase (matter) , chemistry , chemical engineering , polymer chemistry , materials science , organic chemistry , copolymer , polymer , catalysis , engineering
Normally, an ionic liquids (ILs) is classified as hydrophilic or hydrophobic depending on its composition, whether it is miscible or immiscible with water. Nevertheless, this classification is ambiguous, since the miscibility of some ILs with water is strongly depending on temperature change. There are two classifications of thermo-responsive ionic liquids (TRILs) which are lower critical solution temperature (LCST) and upper critical solution temperature (UCST) behavior types. The aim of this study is to synthesis and characterize tetrafloroborate-based (BF 4 − ) anion with different alkyl chain of imidazolium- based cations ([Emim], [Bmim], [Hmim], [Omim]) and trifloroacetate (CFOO − ) anion with different cations (ammonium, anilinium, pyridinium and phosphonium). The prepared ILs were mixed with water (30:70 wt %) and the resulting solutions were stirred vigorously for certain period of time. These solutions were cooled to 0 0 C and then gradually heated to 70 0 C. When the solution was found to be phase-separated upon heating, this mixture undergoes the LCST- type phase transition but its contrary with UCST behavioral. The TRILs were characterized using Fourier Transform Infrared (FTIR) to identify the functional group and Nuclear Magnetic Resonance (NMR) in confirming the structure. Due to the special property of TRILs that became phase separation by changing the temperature, it can be recovered easily and reused for many recycles in wide range of application.