The right blend of R & D : the third Coatings Science International Conference in Noordwijk, Netherlands

Dirk Meine: The third Coatings Science International Conference took place from 25 to 29 June in Noordwijk, Netherlands, and was again well supported by some 114 attendees/ Thirty-three technical papers plus poster presentations from university and industrial coatings reserch offered an interesting overview of the current state of scientific developments

Intense scientific exchange: The second Coatings Science International conference 2006 in Noordwijk

Dirk Meine: From 26 to 30 June, 110 coatings scientists from 17 countries at the second CoSI conference in Noordwijk, Netherlands, engaged in high-level discussions about new developments in the world of coatings and surface sciences

Succesful COSI premiere: The first Coatings Science International conference in Noordwijk

Dirk Meine, Hanover The eagerly awaited fist conference of Coatings Science International (CoSI), the successor to the venerable Athens conference, was held in Noordwijk, Netherlands, from 28 June to 1 July 2005

In-depth exchange of ideas : the fifth Coatings Science International Conference in Noordwijk, the Netherlands

Kirsten Wrede: A balanced mixture of academic and industrial presentations, lively discussions and an intensive exchange of ideas - the Coatings Science International Conference (COSI) has again demonstrated its quality. Some 90 international coatings experts from both industry and academia gathered at the fifth COSI conference in Noordwijk at the Dutch North Sea coast. Slightly fewer participants than in 2008 - due to the global economic crisis, as the organisers explained

COSI 2011: Clear focus on scientific backgrounds.

Kirsten Wrede With a warm welcome prof. Rolf van Benthem, Chair of the organizing committee, greeted the attendees of the 7th Coatings Science International Conference (CoSi) in Noordwijk, the Netherlands, at the first conference day. With temperatures exceeding 35 °C at least on the first two conference days, this could be taken quite literally

COSI Noordwijk wil Europa's nummer 1 worden: Praktijkacademie voor coatingtechnologie

Van 25 tot en met 29 juni werd te Noordwijk voor de derde keer het congres Coatings Science International gehouden. In drie thematische delen werden 34 lezingen gepresenteerd, waarvan 18 academisch en 16 industrieel van aard, en 21 posters. Met 117 deelnemers (89 uit Europa) uit 25 landen was het op 3 stoelen na uitverkocht; 36 deelnemers hadden een academisch achtergrond en 81 industrieel. Drie awards werden uitgereikt; voor wetenschappelijk innovatie, voor creativiteit en voor de beste poster

Bio-based poly(urethane urea) dispersions with low internal stabilizing agent contents and tunable thermal properties

Poly(urethane urea)s dispersed in water were prepared from biobased monomers, including a fatty acid-derived diisocyanate (DDI), the lysine-derived ethyl ester l-lysine diisocyanate (EELDI) and 1,4:3,6-dianhydro-d-glucitol (isosorbide, IS). Ionic stabilization of the polymer particles in water was achieved by incorporating dimethylolpropionic acid (DMPA) in the polyurethane backbone. The synthesis of isocyanate-functional prepolymers with number-average molecular weights (Mn) of approximately 6000 g/mol was followed by their dispersion in water and chain extension using ethylene diamine. The chain extension procedure was optimized, resulting in final Mn values of approximately 17,000 g/mol. The replacement of DDI by EELDI and the incorporation of IS into the polymer composition effectively reduced the required amount of DMPA from 6.0 to 2.0 wt% to render stable dispersions and significantly enhanced the Tg values of dispersion-cast films to 60 °C (1st Tg) and to above 70 °C (2nd Tg), however, at the expense of slightly reduced thermal stability. The asymmetric structure of EELDI and its pendant ester group potentially facilitated the dispersion stability, the latter through possible (partial) hydrolysis. Accordingly, aqueous PU dispersions with a renewable content up to 97 wt% and sufficiently high, tunable film Tg values have been obtained

Intramolecularly catalyzed dynamic polyester networks using neighboring carboxylic and sulfonic acid groups

\u3cp\u3eDynamic covalent bonds in a polymer network lead to plasticity, reshapability, and potential recyclability at elevated temperatures in combination with solvent-resistance and better dimensional stability at lower temperatures. Here we report a simple one-step procedure for the catalyst-free preparation and intramolecularly catalyzed stress-relaxation of dynamic polyester networks. The procedure is based on the coupling of branched OH-end functional polyesters (functionality ≥ 3) by pyromellitic dianhydride (PMDA) or 2,5-bis(methoxy-carbonyl) benzenesulfonic acid resulting in ester linkages with, respectively, a COOH or a SO\u3csub\u3e3\u3c/sub\u3eH group in a position ortho to the ester bond. This approach leads to an efficient external catalyst-free dynamic polyester network, in which the topology rearrangements occur via a dissociative mechanism involving anhydrides. The SO\u3csub\u3e3\u3c/sub\u3eH-containing network is particularly interesting, as it shows the fastest stress relaxation and does not suffer from unwanted additional transesterification reactions, as was observed in the COOH-containing network.\u3c/p\u3

Biomass-derived, functional step-growth polymers for coating applications

Performance polymers derived from biomass represent a fascinating and increasingly important field of research, as such macromolecules offer differentiated material properties as compared to conventional polymers from fossil feedstock.1,2 The aim of our research is to understand the chemistry of bio-based building blocks and the structure-property relations of the resulting novel polymers. For thermosetting polymer systems, some of the main challenges include enhancing the polymer functionality, mechanical performance and thermal stability. A range of fully aliphatic, 1,4:3,6-dianhydrohexitol (DAH) based polyesters and polycarbonates are presented, designed for thermosetting coating applications. In this paper, we focus on the reactivity of the DAH isomers under different reaction conditions as well as on methods to improve the polymer functionality