Inducing Thermoreversible Optical Transitions in Urethane-Acrylate Systems via Ionic Liquid Incorporation for Stretchable Smart Devices

2021 ◽  
Author(s):  
Terence Yan King Ho ◽  
Ankit . ◽  
Benny Febriansyah ◽  
Natalia Yantara ◽  
Shreyas Pethe ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Lower Critical Solution Temperature ◽  
Solution Temperature ◽  
Smart Devices ◽  
Urethane Acrylate ◽  
Optical Transitions ◽  
Critical Solution Temperature ◽  
External Stimuli

Hydrogels are able to exhibit optical transitions in the presence of external stimuli such as temperature, driven by the lower critical solution temperature (LCST) phenomena. However, they suffer from inherent...

scholarly journals Unusual Lower Critical Solution Temperature Phase Behavior of Poly(benzyl methacrylate) in a Pyrrolidinium-Based Ionic Liquid

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4850
Author(s):  
Brian R. Carrick ◽  
Claire L. Seitzinger ◽  
Timothy P. Lodge
Keyword(s):  
Ionic Liquid ◽  
Phase Behavior ◽  
Lower Critical Solution Temperature ◽  
Second Virial Coefficient ◽  
Coexistence Curve ◽  
Solution Temperature ◽  
Temperature Phase ◽  
Strong Concentration ◽  
Critical Solution Temperature ◽  
Heating And Cooling

Polymer/ionic liquid systems are being increasingly explored, yet those exhibiting lower critical solution temperature (LCST) phase behavior remain poorly understood. Poly(benzyl methacrylate) in certain ionic liquids constitute unusual LCST systems, in that the second virial coefficient (A2) in dilute solutions has recently been shown to be positive, indicative of good solvent behavior, even above phase separation temperatures, where A2 < 0 is expected. In this work, we describe the LCST phase behavior of poly(benzyl methacrylate) in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide for three different molecular weights (32, 63, and 76 kg/mol) in concentrated solutions (5–40% by weight). Turbidimetry measurements reveal a strong concentration dependence to the phase boundaries, yet the molecular weight is shown to have no influence. The critical compositions of these systems are not accessed, and must therefore lie above 40 wt% polymer, far from the values (ca. 10%) anticipated by Flory-Huggins theory. The proximity of the experimental cloud point to the coexistence curve (binodal) and the thermo-reversibility of the phase transitions, are also confirmed at various heating and cooling rates.

scholarly journals Irregular solution thermodynamics of wood pulp in the superbase ionic liquid [m-TBDH][AcO]

RSC Advances ◽  
2020 ◽  
Vol 10 (69) ◽  
pp. 42200-42203
Author(s):  
Gordon W. Driver ◽  
Ilkka A. Kilpeläinen
Keyword(s):  
Ionic Liquid ◽  
Lower Critical Solution Temperature ◽  
Wood Pulp ◽  
Solution Thermodynamics ◽  
Solution Temperature ◽  
Cellulose Dissolution ◽  
Protic Ionic Liquid ◽  
Critical Solution Temperature ◽  
Irregular Solution

Thermochemical analysis of cellulose dissolution character in the superbase containing protic ionic liquid [m-TBDH][AcO] reveals lower critical solution temperature (LCST) behaviour.

scholarly journals Thermo-responsive draw solute for forward osmosis process; poly(ionic liquid) having lower critical solution temperature characteristics

RSC Advances ◽  
2019 ◽  
Vol 9 (51) ◽  
pp. 29493-29501 ◽  
Author(s):  
Changha Ju ◽  
Chanhyuk Park ◽  
Taehyung Kim ◽  
Shinwoo Kang ◽  
Hyo Kang
Keyword(s):  
Ionic Liquid ◽  
Lower Critical Solution Temperature ◽  
Forward Osmosis ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Temperature Characteristics ◽  
Poly Ionic Liquid

A poly(ionic liquid) having lower critical solution temperature characteristics was synthesized to investigate its suitability as a draw solute for forward osmosis.

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