Homogeneous Esterification of Xylan-Rich Hemicelluloses with Maleic Anhydride in Ionic Liquid

2010 ◽  
Vol 11 (12) ◽  
pp. 3519-3524 ◽  
Author(s):  
Xin-wen Peng ◽  
Jun-li Ren ◽  
Run-cang Sun
Keyword(s):  
Ionic Liquid ◽  
Maleic Anhydride

Study on the Chemical Modification of Cellulose in Ionic Liquid with Maleic Anhydride

2012 ◽  
Vol 581-582 ◽  
pp. 287-291 ◽  
Author(s):  
Hai Feng Li ◽  
Huan Li ◽  
Xuan Zhong ◽  
Xin Da Li ◽  
Magdi E. Gibril ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Infrared Spectroscopy ◽  
Reaction Time ◽  
Thermogravimetric Analysis ◽  
Maleic Anhydride ◽  
Chemical Modification ◽  
Cotton Cellulose ◽  
Optimal Conditions ◽  
Mass Ratio

Dissolution and regeneration of cotton cellulose using ionic liquids as solvent was investigated. In this paper, modification of celluloses with maleic anhydride (MA) was carried out in ionic liquid,1-allyl-3-methylimidazolium chloride(AmimCl).The maleylation celluloses with degrees of substitution (DS) between 0.85and 1.46 were accessible in IL. The effects of reaction time, temperature and mass ratio of the MA in cellulose were investigated. These maleylation celluloses were characterized by infrared spectroscopy, thermogravimetric analysis (TGA). Experiments showed that the optimal conditions for grafting were: mass ratio of maleic anhydride and cotton cellulose 0.8; reaction time of 90 min; temperature of 80 °C.

scholarly journals Synthesis and Application of New Amphiphilic Asphaltene Ionic Liquid Polymers to Demulsify Arabic Heavy Petroleum Crude Oil Emulsions

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1273 ◽  
Author(s):  
Ali I. Ismail ◽  
Ayman M. Atta ◽  
Mohamed El-Newehy ◽  
Mohamed E. El-Hefnawy
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Maleic Anhydride ◽  
Crude Oil ◽  
Acid Chloride ◽  
Aliphatic Chain ◽  
Petroleum Crude ◽  
Heavy Petroleum ◽  
Chemical Structures ◽  
Oil Emulsions

Asphaltenes are heavy petroleum crude oil components which limit the production of petroleum crude oil due to their aggregation and their stabilization for all petroleum crude oil water emulsions. The present study aimed to modify the chemical structures of isolated asphaltenes by converting them into amphiphilic polymers containing ionic liquid moieties (PILs) to demulsify the emulsion and replace the asphaltene layers surrounding the oil or water droplets in petroleum crude oil emulsions. The literature survey indicated that no modification occurred to produce the PILs from the asphaltenes. In this respect, the asphaltenes were modified via oxidation of the lower aliphatic chain through carboxylation followed by conversion to asphaltene acid chloride that reacted with ethoxylated N-alkyl pyridinium derivatives. Moreover, the carboxylation of asphaltenes was carried out through the Diels–Alder reaction with maleic anhydride that was linked with ethoxylated N-alkyl pyridinium derivatives to produce amphiphilic asphaltene PILs. The produced PILs from asphaltenes acid chloride and maleic anhydride were designated as AIL and AIL-2. The chemical structure and thermal stability of the polymeric asphaltene ionic liquids were evaluated. The modified structure of asphaltenes AIL and AIL-2 exhibited different thermal characteristics involving glass transition temperatures (Tg) at −68 °C and −45 °C, respectively. The new asphaltenes ionic liquids were adsorbed at the asphaltenes surfaces to demulsify the heavy petroleum crude emulsions. The demulsification data indicated that the mixing of AIL and AIL-2 100 at different ratios with ethoxylated N-alkyl pyridinium were demulsified with 100% of the water from different compositions of O:W emulsions 50:50, 90:10, and 10:90. The demulsification times for the 50:50, 90:10, and 10:90 O:W emulsions were 120, 120, and 60 min, respectively. The interaction of the PILs with asphaltene and mechanism of demulsification was also investigated.

scholarly journals Structural Changes of Bagasse dusring the Homogeneous Esterification with Maleic Anhydride in Ionic Liquid 1-Allyl-3-methylimidazolium Chloride

Polymers ◽  
2018 ◽  
Vol 10 (4) ◽  
pp. 433 ◽  
Author(s):  
Huihui Wang ◽  
Wei Chen ◽  
Xueqin Zhang ◽  
Yi Wei ◽  
Aiping Zhang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Maleic Anhydride ◽  
Structural Changes

New reactive poly(ionic liquid)s synthesized by polymer analogous conversion of maleic anhydride containing polymers

Polymer ◽  
2016 ◽  
Vol 96 ◽  
pp. 20-25 ◽  
Author(s):  
Marcus Suckow ◽  
Stephan Zschoche ◽  
Gert Heinrich ◽  
Brigitte Voit ◽  
Frank Böhme
Keyword(s):  
Ionic Liquid ◽  
Maleic Anhydride ◽  
Poly Ionic Liquid

scholarly journals A Comparison among Lignin Modification Methods on the Properties of Lignin–Phenol–Formaldehyde Resin as Wood Adhesive

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3502
Author(s):  
Hamed Younesi-Kordkheili ◽  
Antonio Pizzi
Keyword(s):  
Ionic Liquid ◽  
Maleic Anhydride ◽  
Dimensional Stability ◽  
Phenol Formaldehyde ◽  
Formaldehyde Emission ◽  
Gel Time ◽  
Bending Modulus ◽  
Lignin Modification ◽  
Solids Content ◽  
Modified Lignin

The research aim of this work is to determine the influence of lignin modification methods on lignin–phenol–formaldehyde (LPF) adhesive properties. Thus, glyoxal (G), phenol (P), ionic liquid (IL), and maleic anhydride (MA) were used to modify lignin. The modified lignins were used for phenol substitution (50 wt%) in phenol–formaldehyde adhesives. The prepared resins were then used for the preparation of wood particleboard. These LPF resins were characterized physicochemically, namely by using standard methods to determine gel time, solids content, density, and viscosity, thus the physicochemical properties of the LPF resins synthesized. The panels dimensional stability, formaldehyde emission, bending modulus, bending strength, and internal bond (IB) strength were also measured. MA-modified lignin showed by differential scanning calorimetry (DSC) the lowest temperature of curing than the resins with non-modified lignin and modified with IL, phenolared lignin, and glyoxal. LPF resins with lignin treated with maleic anhydride presented a shorter gel time, higher viscosity, and solids content than the resins with other lignin modifications. Equally, the particleboard panels prepared with LPF resins with maleic anhydride or with ionic liquid had the lowest formaldehyde emission and the highest mechanical strength among all the synthesized resins. The dimensional stability of all panels bonded with modified lignin LPF resins presented no difference of any significance.

scholarly journals Synthesis of New Hybrid Structured Magnetite Crosslinked Poly Ionic Liquid for Efficient Removal of Coomassie Brilliant Blue R-250 Dye in Aqueous Medium

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 441
Author(s):  
Abdelrahman O. Ezzat ◽  
Ahmed M. Tawfeek ◽  
Jothi Ramalingam Rajabathar ◽  
Hamad A. Al-Lohedan
Keyword(s):  
Ionic Liquid ◽  
Maleic Anhydride ◽  
Aqueous Solutions ◽  
Brilliant Blue ◽  
Order Kinetic ◽  
Coomassie Brilliant Blue ◽  
Chemical Structures ◽  
Vinyl Pyridine ◽  
Poly Ionic Liquid ◽  
Coomassie Brilliant

In this work, new crosslinked pyridinium poly ionic liquid and its magnetite hybrid structured composite were prepared and applied to remove the toxic dye Coomassie Brilliant Blue (CBB-R250) from aqueous solutions. In this respect, vinyl pyridine, maleic anhydride, and dibromo nonane were used to prepare crosslinked quaternized vinyl pyridinium/maleic anhydride ionic liquid (CQVP-MA). Furthermore, a linear copolymer was prepared by the reaction of vinyl pyridine with bromo nonane followed by its copolymerization with maleic anhydride in order to use it as a capping agent for magnetite nanoparticles. The monodisperse MNPs were incorporated into the crosslinked PIL (CQVP-MA) by ultrasonication to prepare CQVP-MA/Fe3O4 composite to facilitate its recovery using an external magnetic field and enhance its adsorption capacity. The chemical structures, thermal stabilities, zeta potential, particle size, EDS, and SEM of the prepared CQVP-MA and CQVP-MA/Fe3O4 were investigated. Adsorption kinetics, isotherms, and mechanisms of CB-R250 elimination from aqueous solutions using CQVP-MA and CQVP-MA/Fe3O4 were also studied, and the results revealed that the pseudo second-order kinetic model and the Langmuir isotherm model were the most suitable to describe the CBB adsorption from an aqueous solution. The adsorption capacities of CQVP-MA and CQVP-MA/Fe3O4 were found to be 1040 and 1198, respectively, which are more than those for previously reported material in the literature with reasonable stability for five cycles.

Soft ionic liquid based resistive memory characteristics in a two terminal discrete polydimethylsiloxane cylindrical microchannel

2020 ◽  
Vol 8 (38) ◽  
pp. 13368-13374
Author(s):  
Muhammad Umair Khan ◽  
Gul Hassan ◽  
Jinho Bae
Keyword(s):  
Ionic Liquid ◽  
Acrylic Acid ◽  
Sodium Hydroxide ◽  
Sodium Salt ◽  
Resistive Memory ◽  
Cylindrical Microchannel ◽  
Memory Characteristics ◽  
Poly Acrylic Acid

This paper proposes a novel soft ionic liquid (IL) electrically functional device that displays resistive memory characteristics using poly(acrylic acid) partial sodium salt (PAA-Na+:H2O) solution gel and sodium hydroxide (NaOH) in a thin polydimethylsiloxane (PDMS) cylindrical microchannel.

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