Insights on the catalytic behaviour of sulfonic acid-functionalized ionic liquids (ILs) in transesterification reactions – voltammetric characterization of sulfonic task-specific ILs with bisulfate anions

2021 ◽  
Vol 23 (4) ◽  
pp. 2731-2741
Author(s):  
María B. Martini ◽  
José L. Fernández ◽  
Claudia G. Adam
Keyword(s):  
Cyclic Voltammetry ◽  
Ionic Liquids ◽  
Sulfuric Acid ◽  
Sulfonic Acid ◽  
Acid Catalysis ◽  
On Demand ◽  
Catalytic Behaviour ◽  
Sulfonic Acid Groups

Cyclic voltammetry measurements on imidazolic ionic liquids with sulfonic acid groups and bisulfate counterions revealed that they work as efficient reservoirs of sulfuric acid and are able to dose it on demand to uphold an efficient acid catalysis.

scholarly journals Preparation and Characterization of Self-Dispersing Phthalocyanine Blue 15:4 Pigment for Dyeing of Wool Textiles

Coatings ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 741
Author(s):  
Lun Nie ◽  
Guangtao Chang ◽  
Ruoxin Li
Keyword(s):  
Sulfonic Acid ◽  
Coupling Reaction ◽  
Acid Dyes ◽  
Light Fastness ◽  
Grade 5 ◽  
Weather Resistance ◽  
Sulfonic Acid Groups ◽  
Positively Charged ◽  
Better Than

A self-dispersing pigment was produced by a diazonium coupling reaction; the pigment reacted with aromatic diazonium salts which were generated by the reaction of p-aminobenzene sulfonic acid and sodium nitrite. The surface of the pigment particles was negatively charged due to sulfonic acid groups on the pigment surface. The pigment particle size and zeta potential were, respectively, 134.5 nm and −45.4 mV at neutral pH. The wool surface was positively charged by adjusting the pH; then the anionic self-dispersing pigment dyed the cationic wool. The results show that self-dispersing pigment can adhere well without a binder, and that the K/S value is closely related to pH, dyeing time, and the amount of pigment. The color fastness of the wool was good and the light fastness of the wool was grade 5, which is better than acid dyes. Self-dispersing pigments are potential candidates for dyeing high-weather-resistance textiles.

Synthesis and characterization of proton-conducting copolyimides bearing pendant sulfonic acid groups

2005 ◽  
Vol 43 (8) ◽  
pp. 1545-1553 ◽  
Author(s):  
Yan Yin ◽  
Otoo Yamada ◽  
Yoshiki Suto ◽  
Takashi Mishima ◽  
Kazuhiro Tanaka ◽  
...  
Keyword(s):  
Sulfonic Acid ◽  
Synthesis And Characterization ◽  
Proton Conducting ◽  
Sulfonic Acid Groups

Synthesis and solid-state NMR characterization of cubic mesoporous silica SBA-1 functionalized with sulfonic acid groups

2011 ◽  
Vol 359 (1) ◽  
pp. 86-94 ◽  
Author(s):  
Hui-Hsu Gavin Tsai ◽  
Po-Jui Chiu ◽  
Guang-Liang Jheng ◽  
Chun-Chiang Ting ◽  
Yu-Chi Pan ◽  
...  
Keyword(s):  
Solid State ◽  
Mesoporous Silica ◽  
Solid State Nmr ◽  
Sulfonic Acid ◽  
Nmr Characterization ◽  
Cubic Mesoporous ◽  
Sulfonic Acid Groups

Mild surface modification of para-aramid fiber by dilute sulfuric acid under microwave irradiation

2016 ◽  
Vol 87 (7) ◽  
pp. 799-806 ◽  
Author(s):  
Tingting Deng ◽  
Guangxian Zhang ◽  
Fangyin Dai ◽  
Fengxiu Zhang
Keyword(s):  
Surface Modification ◽  
Sulfuric Acid ◽  
Microwave Irradiation ◽  
Sulfonic Acid ◽  
Breaking Strength ◽  
Aramid Fiber ◽  
Aramid Fibers ◽  
X Ray ◽  
Dilute Sulfuric Acid ◽  
Sulfonic Acid Groups

In aramid fiber-reinforced composites manufacturing, para-aramid fiber requires surface modification to improve its interfacial adhesion with matrix materials. In this study, aramid fiber was modified with dilute sulfuric acid, which was gradually concentrated under microwave irradiation. Results showed that the aramid fiber could be efficiently modified. Sulfonic acid groups were introduced on the surface of the aramid fiber, as confirmed by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The breaking strength and thermal stability of the modified aramid fiber were not adversely affected. When the concentration of sulfuric acid was 30.0 g/L, the breaking strength of the aramid fiber remained at 90.7% of the original value, and the number of sulfonic acid groups of 1 g modified aramid fibers was 1.38 × 10–5 mol/g. Thermogravimetric and X-ray diffraction analyses showed that the main structure of the aramid fibers was not affected. The aramid fiber surface was not severely etched, as evidenced by scanning electron microscopy images. Therefore, this modifying method involving a gradual change in sulfuric acid concentration may be widely applied in many fields.

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