Daniel Rentsch

Swiss Federal Laboratories for Materials Science and Technology

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Arndt Remhof

Swiss Federal Laboratories for Materials Science and Technology

Corsin Battaglia

Swiss Federal Laboratories for Materials Science and Technology

Sabyasachi Gaan

Swiss Federal Laboratories for Materials Science and Technology

Ralf Miethchen

University of Rostock

Roland Hany

Swiss Federal Laboratories for Materials Science and Technology

ZŁ

Zbigniew Łodziana

Institute of Nuclear Physics, Polish Academy of Sciences

Ryo Asakura

Swiss Federal Laboratories for Materials Science and Technology

Yigang Yan

Sichuan University

SeyedHosein Payandeh

Karlsruhe Institute of Technology

Barbara Lothenbach

Swiss Federal Laboratories for Materials Science and Technology

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Swiss Federal Laboratories for Materials Science and Technology

217

ETH Zurich

118

École Polytechnique Fédérale de Lausanne

Swiss Federal Institute of Aquatic Science and Technology

University of Zurich

University of St. Gallen

Centre National de la Recherche Scientifique

Paul Scherrer Institute

University of Basel

University of Bern

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Coumarin-DPPO a new bio-based phosphorus additive for poly(lactic acid): Processing and flame retardant application

Polymer Degradation and Stability (2024)

Daniele Roncucci Marie-Odile Augé Sithiprumnea Dul Jiuke Chen Ali Gooneie

This study addresses very important aspects of the sustainable development of new flame retardant materials: (i) the preparation of a novel flame retardant (FR) additive from bio-resource, (ii) its use as FR additive in poly(lactic acid) (PLA) based composites and, (iii) the in vitro toxicity assessment of the FR. The synthesis of this bio-based FR additive was achieved through a phospha-Michael addition of diphenylphosphine oxide (DPPO) and the naturally occurring compound coumarin, yielding 4-(diphenylphosphoryl)chroman-2-one (CU-DPPO). The flame-retarded CUDPPO PLA composites were prepared either via conventional melt blending of commercially available PLA or through reactive extrusion (REX) of L-lactide. Characterization of the composites was performed through nuclear magnetic resonance (NMR), size exclusion chromatography (SEC) and thermogravimetric analysis (TGA). TGA analysis of the FR-PLA composites showed an increase in thermal stability, confirming the beneficial effect of the CU-DPPO additive. Direct insertion probe mass spectrometry (DIP-MS) analysis was used to gain insight on the mechanism of action of the FR additive, suggesting gas-phase activity. Rheological measurements exhibited the thermo-oxidative stabilizing effect in the modified PLA. The flame retardancy of the melt-blended PLA composites with CU-DPPO was investigated by limited oxygen index (LOI), cone calorimetry and vertical burning tests (UL 94 and BKZ-VB). Samples containing 10 wt.% of CU-DPPO showed improved fire performance with a limiting oxygen index (LOI) of 29 %, passing Swiss vertical burning test (BKZ-VB) and obtaining a V-0 rating in the UL 94 test. Moreover, a preliminary toxicity assessment of the CU-DPPO, carried out using an established in vitro platform, showing no adverse effects on cell viability.

Limiting oxygen index

Thermogravimetric analysis

Polylactic Acid

Thermal Stability

10.1016/j.polymdegradstab.2024.110737

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Citations (5)

Synthesis, stability and Li-ion mobility of nanoconfined Li₂B₁₂H₁₂

Dalton Transactions (2017)

Yigang Yan Daniel Rentsch Corsin Battaglia Arndt Remhof

We demonstrate the first synthesis of nanoconfined Li₂B₁₂H₁₂ using nano-porous SiO₂ scaffold and evaluate the thermal stability and Li-ion mobility.

10.1039/c7dt02946b

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Citations (19)

ChemInform Abstract: Organofluorine Compounds and Fluorinating Agents. Part 10. Unusual Regio‐ and Stereoselective 3,4‐Acetalizations of Selected Pyranosides by Hexafluoroacetone as a Result of a New Reaction Pathway.

ChemInform (1994)

Ralf Miethchen Daniel Rentsch Manfred Michalik

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Hexafluoroacetone

10.1002/chin.199423229

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CCDC 1988459: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

SeyedHosein Payandeh Ryo Asakura Petroula Avramidou Daniel Rentsch Zbigniew Łodziana

10.5517/ccdc.csd.cc24r4vx

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CCDC 1988462: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

SeyedHosein Payandeh Ryo Asakura Petroula Avramidou Daniel Rentsch Zbigniew Łodziana

10.5517/ccdc.csd.cc24r4y0

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Diastereoselective self-assembly of bisheptahelicene on Cu(111)

Chemical Communications (2018)

Anaïs Mairena Manfred Parschau Johannes Seibel Martin Wienke Daniel Rentsch

Stereochemical effects during two-dimensional crystallization of bisheptahelicene diastereomers on a Cu(111) surface have been studied with scanning tunnelling microscopy. The (M,M)- and (P,P)-enantiomers crystallize into a monolayer racemate lattice, whereas the (M,P)-diastereomers aggregate into their own monolayer phase.

10.1039/c8cc04160a

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Influence of aluminum sulfate on properties and hydration of magnesium potassium phosphate cements

Cement and Concrete Research (2022)

Biwan Xu Frank Winnefeld Bin Ma Daniel Rentsch Barbara Lothenbach

Aluminum sulfate shows a positive effect on preventing efflorescence of magnesium potassium phosphate (MKP) cements. Its influence on the MKP cement properties and hydration is explored in this study. Compared to a reference cement (Mg/PO4 molar ratio = 4, w/c ratio = 0.25), aluminum sulfate retards setting, increases compressive strength, and has little influence on the short-term volume stability. Aluminum sulfate slows down the hydration kinetics, decreases the pH values, accelerates the depletion of KH2PO4, and thus mitigates the formation of efflorescence. It also modifies the hydrate assemblage. In addition to K-struvite, aluminum sulfate leads to the formations of arcanite and aluminum-containing hydrates such as amorphous aluminum phosphate, possibly phosphate containing LDH (layered double hydroxide) and minyulite-like phases. The formation of amorphous MgHPO4 and minor amounts of bobierrite and brucite as observed in the reference paste, are suppressed in the presence of aluminum.

Efflorescence

Brucite

Magnesium phosphate

Ettringite

Potassium phosphate

Struvite

10.1016/j.cemconres.2022.106788

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Citations (39)

New Metabolites in the Degradation of α- and γ-Hexachlorocyclohexane (HCH): Pentachlorocyclohexenes Are Hydroxylated to Cyclohexenols and Cyclohexenediols by the Haloalkane Dehalogenase LinB from Sphingobium indicum B90A

Journal of Agricultural and Food Chemistry (2008)

Vishakha Raina Daniel Rentsch Thomas Geiger Poonam Sharma Hans Rudolf Buser

Technical hexachlorocyclohexane (HCH) and lindane are obsolete pesticides whose former production and use led to widespread contaminations posing serious and lasting health and environmental risks. Out of nine possible stereoisomers, α-, β-, γ-, and δ-HCH are usually present at contaminated sites, and research for a better understanding of their biodegradation has become essential for the development of appropriate remediation technologies. Because haloalkane dehalogenase LinB was recently found responsible for the hydroxylation of β-HCH, δ-HCH, and δ-pentachlorocyclohexene (δ-PCCH), we decided to examine whether β- and γ-PCCH, which can be formed by LinA from α- and γ-HCH, respectively, were also converted by LinB. Incubation of such substrates with Escherichia coli BL21 expressing functional LinB originating from Sphingobium indicum B90A showed that both β-PCCH and γ-PCCH were direct substrates of LinB. Furthermore, we identified the main metabolites as 3,4,5,6-tetrachloro-2-cyclohexene-1-ols and 2,5,6-trichloro-2-cyclohexene-1,4-diols by nuclear magnetic resonance spectroscopy and gas chromatography−mass spectrometry. In contrast to α-HCH, γ-HCH was not a substrate for LinB. On the basis of our data, we propose a modified γ-HCH degradation pathway in which γ-PCCH is converted to 2,5-cyclohexadiene-1,4-diol via 3,4,5,6-tetrachloro-2-cyclohexene-1-ol and 2,5,6-trichloro-2-cyclohexene-1,4-diol.

Hexachlorocyclohexane

Lindane

Hydroxylation

10.1021/jf800465q

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Citations (38)

Thermal and electrochemical interface compatibility of a hydroborate solid electrolyte with 3 V-class cathodes for all-solid-state sodium batteries

Zenodo (CERN European Organization for Nuclear Research) (2023)

Ryo Asakura Léo Duchêne SeyedHosein Payandeh Daniel Rentsch Hans Hagemann

10.5281/zenodo.7612892

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Citations (0)