Effect of degree of sulfonation on the performance of adsorbent SAPO-34/S-PEEK composite coatings for adsorption heat pumps

Palamara, Davide; Bruzzaniti, Paolo; Calabrese, Luigi; Proverbio, E.

doi:10.1016/j.porgcoat.2021.106193

Cited by 6 publications

(7 citation statements)

References 54 publications

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“…The degree of sulfonation (DS) is defined as the percentage of repeating units of the polymer that has been sulfonated . DS was determined by acid–base titration.…”

Section: Resultsmentioning

confidence: 99%

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N-Sulfonated Poly(arylene-oxindole) for Vanadium Redox Flow Battery Applications

Bavdane

Sreenath

Nikumbe

et al. 2022

ACS Appl. Energy Mater.

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We describe the synthesis of N-sulfonated poly(arylene-oxindole) by metal-free superacid, denoted IDB, IBP, and IFP by polycondensation of isatin with 1,4-diphenoxybenzene, biphenyl, and fluorene, monomer, respectively. All three polymers provide flexible transparent films with high decomposition temperatures (400 to 500 °C) as well as good mechanical and oxidative stability. The physiochemical and electrochemical characteristics of the IDB membrane were better, in comparison to IBP and IFP. The presence of an ether linkage in IDB facilitates the formation of a highly negative charge amide ion, resulting in a high degree of N-sulfonation. To evaluate performance in VRFB, relevant physical properties and stability in a highly oxidative environment (2.1 M H2SO4 and 1.6 M VO2 +) were evaluated. In a single cell VRFB test, the peak power density for IDB, IBP, and IFP was 275 mW cm–2, 240 mW cm–2, and 225 mW cm–2 respectively, at 300 mA cm–2 current density. The IDB membrane showed 97% Coulombic, 68% energy, and 66% voltage efficiencies at 100 mA cm–2 over 200 charge/discharge cycles. In comparison to Nafion 117 in identical experimental settings, the OCV studies validated the low rate of self-discharge, showing the IDB membrane is better suited for VRFB applications.

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“…The degree of sulfonation (DS) is defined as the percentage of repeating units of the polymer that has been sulfonated . DS was determined by acid–base titration.…”

Section: Resultsmentioning

confidence: 99%

“…The degree of sulfonation (DS) is defined as the percentage of repeating units of the polymer that has been sulfonated. 25 DS was determined by acid−base titration. A known weight (0.5 g) of the membrane was dissoved in 10 mL of NMP and titrated against 0.1 M NaOH using phenophthalien indicator.…”

Section: Determination Of the Degree Of Sulfonation (Ds)mentioning

confidence: 99%

N-Sulfonated Poly(arylene-oxindole) for Vanadium Redox Flow Battery Applications

Bavdane

Sreenath

Nikumbe

et al. 2022

ACS Appl. Energy Mater.

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“…In [ 28 ], the batch SP-Z90 was indicated as an optimal formulation, considering it as a compromise between high content of zeolite and adequate mechanical performance. It is important to note that the pull-off strength obtained for SrP-Z95 (1.70 ± 0.3 MPa) is slightly higher than that of SP-Z90 (1.66 ± 0.1 MPa).…”

Section: Resultsmentioning

confidence: 99%

“…For comparison, results referring to unrecycled S-PEEK composite coatings were also reported. Their mechanical and thermo-chemical characterizations are detailed in [ 25 , 28 ].…”

Section: Methodsmentioning

confidence: 99%

“…The same authors subsequently carried out a more in-depth study on the mechanical and physicochemical properties of this zeolite/S-PEEK composite coating, investigating the effect of the degree of sulfonation of the S-PEEK and the zeolite content on the mechanical, thermal and water vapor adsorption properties [ 28 ]. The obtained results confirmed that the best compromise between mechanical performance and adsorption capacity was obtained for an intermediate sulfonation of 48 h and a zeolite content of 90 wt.%.…”

Section: Introductionmentioning

confidence: 99%

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Sulfonated-Recycled-PEEK as Matrix of Water Vapor Adsorbent SAPO-34 Based Composite Coatings for Adsorption Heat Pumps: Mechanical and Thermochemical Characterization

Palamara

Calabrese

2022

Materials

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In this work, a composite adsorbent coating constituted by high SAPO 34 content and a sulfonated recycled poly (ether ether ketone) was investigated for adsorption heat pump technology. Specifically, the effect of polymer recycling on mechanical and thermal properties, as well as on water vapor adsorption and desorption performance, has been investigated. The degree of sulfonation obtained after 48 h of reaction remained approximately unaltered. The degradation of the polymer due to recycling anticipates the degradation of the C-C bonds of the polymer by about 20 °C without affecting the temperature at which the sulfonic groups degrade. From the mechanical point of view, the coating containing 90% zeolite, due to the use of recycled PEEK, evidenced a worsening of only 11.8% in scratch resistance compared to the virgin one, whereas the adhesive strength exhibited an increase of about 23.2% due to better miscibility of the sulfonated recycled polymer. Adsorption/desorption isobars show an almost similar adsorption capacity of the coating produced with recycled polymer compared to the virgin one, confirming that the water vapor diffusion is not hindered by the polymer matrix during the adsorption/desorption process.

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Evaluation of ad/desorption dynamics of S-PEEK/Zeolite composite coatings by T-LTJ method

Palamara

Palomba

Calabrese

et al. 2022

Applied Thermal Engineering

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Effect of degree of sulfonation on the performance of adsorbent SAPO-34/S-PEEK composite coatings for adsorption heat pumps

Cited by 6 publications

References 54 publications

N-Sulfonated Poly(arylene-oxindole) for Vanadium Redox Flow Battery Applications

N-Sulfonated Poly(arylene-oxindole) for Vanadium Redox Flow Battery Applications

Sulfonated-Recycled-PEEK as Matrix of Water Vapor Adsorbent SAPO-34 Based Composite Coatings for Adsorption Heat Pumps: Mechanical and Thermochemical Characterization

Evaluation of ad/desorption dynamics of S-PEEK/Zeolite composite coatings by T-LTJ method

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