Surface, textural and catalytic properties of pyridinium hydrogen sulfate ionic liquid heterogenized on activated carbon carrier

Tankov, Ivaylo; Kolev, Hristo; Avdeev, G.

doi:10.1016/j.molliq.2021.117192

Cited by 3 publications

(3 citation statements)

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“…Recently, ionic liquids (ILs) have been investigated as polymerization catalysts/initiators of ε-caprolactone (εCL), ε-caprolactam, and epoxy resins. − ILs are organic salts whose melting point is below 100 °C; indeed, many are liquids at room temperature. , IL molecules usually consist of a cationic “head” with an anionic counterion and one or more hydrophobic (aliphatic and/or aromatic) “tails.” Depending on the type of cationic core, the size and type of the counterion, the length of aliphatic alkyl chain(s), or a combination of alkyl chains with aromatic structures, ILs exhibit several intrinsic properties such as low volatility, high thermal and chemical stability, insignificant flammability, good thermal conductivity, high ionic mobility, stability in the presence of moisture, etc. − Mainly thanks to beneficially high thermal stability and tuneable chemical structures, ILs have a huge potential for applications in the field of polymers, e.g., as initiators of polymerization, catalysts, curing agents, , or building blocks of polymer networks. , However, the high viscosity of ILs and their difficult separation from the products are the main limitations of their wider use in polymer catalysis …”

Section: Introductionmentioning

confidence: 99%

“… 25 , 26 However, the high viscosity of ILs and their difficult separation from the products are the main limitations of their wider use in polymer catalysis. 27 …”

Section: Introductionmentioning

confidence: 99%

“…25,26 However, the high viscosity of ILs and their difficult separation from the products are the main limitations of their wider use in polymer catalysis. 27 To overcome these drawbacks, the concept of heterogenization of ILs has been recently established, which combines the advantages of ILs (mainly high chemical and structural tunability) and LDH support (chemical and thermal resistance, encapsulation ability, etc.). 28 Our previous study showed that ILs immobilized on LDH support significantly accelerated ring-opening polymerization (ROP) of ε-caprolactone (εCL).…”

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confidence: 99%

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Intercalation of Ionic Liquids into LDH Structures for Microwave-Accelerated Polymerizations

Beneš,

Konefał,

Bujok

et al. 2023

Inorg. Chem.

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Microwave-accelerated ring-opening polymerization (ROP) of cyclic esters catalyzed by ionic liquid (IL) anions, intercalated into layered double hydroxides (LDHs), has been recently described as a fast and environmentally friendly synthetic way to prepare biodegradable polyester/LDH nanocomposites. However, to observe this synergistic catalytic effect between microwaves and IL anions and to achieve a homogeneous structure of the final polymer nanocomposite, the IL anions must be efficiently intercalated inside the LDH structure. Herein, we investigate the effects of various metal compositions of M 2+ /Al 3+ LDHs (M = Mg, Co, and Ca) and different LDH synthetic routes (one-step direct coprecipitation, two-step coprecipitation/anion exchange, and two-step urea/anion exchange) on the intercalation efficiency of trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl)phosphinate IL. The most effective IL anion intercalation was observed for Ca 2+ /Al 3+ LDH prepared using the two-step method consisting of coprecipitation and subsequent anion exchange. After optimization, this synthetic pathway led to the production of LDHs with intercalated IL anions and a reduced amount of intercalated water (<0.6 wt %). The catalytic ability of thus optimized LDH particles was demonstrated on the microwave-assisted ROP of ε-caprolactone, showing rapid progress of polymerization. Within minutes, the polycaprolactones with an average molecular mass in the range of 20 000–50 000 g/mol containing fully delaminated and exfoliated LDH nanoparticles were obtained.

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Section: Introductionmentioning

confidence: 99%

“… 25 , 26 However, the high viscosity of ILs and their difficult separation from the products are the main limitations of their wider use in polymer catalysis. 27 …”

Section: Introductionmentioning

confidence: 99%

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