Keimpe J. van den Berg
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View article: Correction to “Synthesis, Morphology, and Particle Size Control of Acidic Aqueous Polyurethane Dispersions”
Correction to “Synthesis, Morphology, and Particle Size Control of Acidic Aqueous Polyurethane Dispersions” Open
[This corrects the article DOI: 10.1021/acs.macromol.4c02046.].
View article: Synthesis, Morphology, and Particle Size Control of Acidic Aqueous Polyurethane Dispersions
Synthesis, Morphology, and Particle Size Control of Acidic Aqueous Polyurethane Dispersions Open
A range of charge-stabilized aqueous polyurethane (PU) dispersions comprising hard segments formed from hydrogenated methylene diphenyl diisocyanate (H12MDI) with dimethylolpropionic acid (DMPA) and ethylenediamine, and soft segments of po…
View article: Diazirine-Functionalized Polyurethane Crosslinkers for Isocyanate-Free Curing of Polyol-Based Coatings
Diazirine-Functionalized Polyurethane Crosslinkers for Isocyanate-Free Curing of Polyol-Based Coatings Open
Polyurethane coatings have strong material properties due to the hydrogen bonding inherent to the urethane groups. However, installing this urethane moiety usually requires curing through difficult-to-handle isocyanates. In this work, we s…
View article: Activation of alkyl hydroperoxides by manganese com plexes of tmtacn for initiation of radical polymerisation of alkenes
Activation of alkyl hydroperoxides by manganese com plexes of tmtacn for initiation of radical polymerisation of alkenes Open
The activation of alkyl hydroperoxides to generate radicals is a key step in the initiation of radical polymerisations in many industrial applications, not least protective coatings. Cobalt soaps are highly effective catalysts under ambien…
View article: A highly efficient and sustainable catalyst system for terminal epoxy-carboxylic acid ring opening reactions
A highly efficient and sustainable catalyst system for terminal epoxy-carboxylic acid ring opening reactions Open
An efficient, green, non-toxic, halide-free catalyst system with iron( iii ) benzoate and guanidinium carbonate facilitates the nucleophilic ring opening of terminal epoxides by carboxylic acids, key process for materials science and coati…
View article: Regioselective palladium-catalysed aerobic oxidation of dextran and its use as a bio-based binder in paperboard coatings
Regioselective palladium-catalysed aerobic oxidation of dextran and its use as a bio-based binder in paperboard coatings Open
Dextran can be selectively oxidized at the C3-position and subsequently crosslinked with dihydrazides.
View article: Waterborne polymers and coatings from bio-based butenolides
Waterborne polymers and coatings from bio-based butenolides Open
We report waterborne bio-based butenolide polymers and coatings using high molecular weight polyurethanes as colloid stabilizing moiety.
View article: Activation of alkyl hydroperoxides by manganese complexes of tmtacn for initiation of radical polymerisation of alkenes
Activation of alkyl hydroperoxides by manganese complexes of tmtacn for initiation of radical polymerisation of alkenes Open
Catalysed activation of alkyl hydroperoxides to generate radicals is a key step in the initiation of radical polymerisations in many applications, not least protective coatings. Manganese complexes show potential as replacements for cobalt…
View article: Thermal/Blue Light Induced Cross‐Linking of Acrylic Coatings with Diazo Compounds
Thermal/Blue Light Induced Cross‐Linking of Acrylic Coatings with Diazo Compounds Open
The thermal curing of industrial coatings (e.g., car painting and metal coil coatings) is accompanied by a substantial energy consumption due to the intrinsically high temperatures required during the curing process. Therefore, the develop…
View article: Electron-Poor Butenolides: The Missing Link between Acrylates and Maleic Anhydride in Radical Polymerization
Electron-Poor Butenolides: The Missing Link between Acrylates and Maleic Anhydride in Radical Polymerization Open
Butenolides are a class of 5-membered lactones that hold great potential as bio-based monomers to replace oil-derived acrylates, of which they are cyclic analogues. Despite this structural resemblance, the reactivity of the unsaturated est…
View article: Formation of substituted dioxanes in the oxidation of gum arabic with periodate
Formation of substituted dioxanes in the oxidation of gum arabic with periodate Open
Oxidation of the renewable polysaccharide feedstock gum arabic opens opportunities for derivatisation.
View article: Formation of substituted dioxanes in the oxidation of gum arabic with periodate
Formation of substituted dioxanes in the oxidation of gum arabic with periodate Open
Renewable polysaccharide feedstocks are of interest in bio-based food packaging, coatings and hydrogels. Their physical properties often need to be tuned by chemical modification, e.g. by oxidation using periodate, to introduce carboxylic …
View article: CCDC 2206396: Experimental Crystal Structure Determination
CCDC 2206396: Experimental Crystal Structure Determination Open
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available …
View article: Isocyanate-Free Polyurea Synthesis via Ru-Catalyzed Carbene Insertion into the N–H Bonds of Urea
Isocyanate-Free Polyurea Synthesis via Ru-Catalyzed Carbene Insertion into the N–H Bonds of Urea Open
Polyureas have widespread applications due to their unique material properties. Because of the toxicity of isocyanates, sustainable isocyanate-free routes to prepare polyureas are a field of active research. Current routes to isocyanate-fr…
View article: Isocyanate-free Polyurea Synthesis via Ru-Catalyzed Car-bene Insertion into the N‒H Bonds of Urea
Isocyanate-free Polyurea Synthesis via Ru-Catalyzed Car-bene Insertion into the N‒H Bonds of Urea Open
Polyureas have widespread applications due to their unique material properties. Due to the toxicity of isocyanates, sus-tainable isocyanate-free routes to prepare polyureas is a field of active research. Current routes to isocyanate-free p…
View article: <i>In situ</i> EPR and Raman spectroscopy in the curing of bis-methacrylate–styrene resins
<i>In situ</i> EPR and Raman spectroscopy in the curing of bis-methacrylate–styrene resins Open
The curing of bis-methacrylate–styrene resins initiated by the cobalt catalyzed decomposition of cumyl hydroperoxide is monitored at ambient temperatures in situ by EPR and Raman spectroscopy.
View article: A sustainable polymer and coating system based on renewable raw materials
A sustainable polymer and coating system based on renewable raw materials Open
A complete biobased process towards polymers and coatings using starting materials derived from renewable resources and implementing sustainable synthetic steps.
View article: Kinetic studies on Lewis acidic metal polyesterification catalysts – hydrolytic degradation is a key factor for catalytic performance
Kinetic studies on Lewis acidic metal polyesterification catalysts – hydrolytic degradation is a key factor for catalytic performance Open
Kinetic studies of Lewis acidic metal-catalyzed polyesterification reactions unveiled that titanium-based catalyst are prone to hydrolytic degradation, while n -BuSnOOH proved to be a robust catalyst.
View article: CCDC 2049109: Experimental Crystal Structure Determination
CCDC 2049109: Experimental Crystal Structure Determination Open
Related Article: Lukas A. Wolzak, Joen J. Hermans, Folkert de Vries, Keimpe J. van den Berg, Joost N. H. Reek, Moniek Tromp, Ties J. Korstanje|2021|Cat.Sci.Tech.|11|3326|doi:10.1039/D1CY00184A
View article: Photo-crosslinking polymers by dynamic covalent disulfide bonds
Photo-crosslinking polymers by dynamic covalent disulfide bonds Open
A simple and general strategy to construct photo-crosslinkable polymers by introducing sidechain 1,2-dithiolanes based on natural thioctic acid is presented.
View article: Mechanistic elucidation of monoalkyltin(<scp>iv</scp>)-catalyzed esterification
Mechanistic elucidation of monoalkyltin(<span>iv</span>)-catalyzed esterification Open
Monoalkyltin-catalyzed esterification was studied under industrially relevant catalytic conditions and was found to have a monomeric active species, with both a monomeric and a dimeric resting state.
View article: A coating from nature
A coating from nature Open
Biomass-derived butenolides are presented as green alternatives for acrylates in coatings with tunable properties.
View article: Titanium‐catalyzed esterification reactions: beyond Lewis acidity
Titanium‐catalyzed esterification reactions: beyond Lewis acidity Open
Esterification is a key reaction and is used in many synthetic and industrial processes, yet the detailed mechanism of operation of often‐used (Lewis acid) catalysts is unknown and subject of little research. Here, we report on mechanistic…