Self Healing Coatings, 21 September 2010

Geachte Leden,

Bijgaand vindt u het programma voor de studdiemiddag op 21 september. Het onderwerp voor deze middag zal zijn: Self Healing Coatings.

De uitnodiging kunt tevens hier downloaden.

Het bestuur hoopt u weer te mogen begroeten in Nieuwegein.

Programma
12.30 uur Ontvangst en registratie met koffie en broodjes

13.30 uur Opening en introductie door de heer Dr. P.J.A. Geurink – voorzitter NVVT

13.40 uur Lezing in het Engels
A new generation high solid self-healing 2-component polyurethane coatings
Dr. Thomas Klimmasch (Bayer MaterialScience AG)
Two-component polyurethane topcoats have set a standard for painting wooden
products, vehicles and plastic substrates with high appearance and durability. For high
performance coatings applications the market is additionally requiring topcoats with
high initial scratch resistance as well as the ability of self-healing small scratches.
Polyurethane coatings have a particularly pronounced self-healing ability due to the fact
that a tight molecular network can be created that is flexible between the points of
intersection.
This paper presents a new generation high solid self-healing 2-component
polyurethane coatings which are in line with this concept and have excellent overall
properties.

14.15 uur Lezing in het Engels
Self-replenishing low-surface-energy coatings: understand to apply
Dr. Catarina Esteves (TU Eindhoven, Laboratory of Materials and Interface Chemistry)
Low-surface-energy coatings are attracting much interest due to their weak interaction
with the surrounding media which results in advanced surface-related properties, such
as easy-to-clean/self-cleaning, anti-bacteria or anti-fouling behaviour.
However, most of the low-surface-energy coatings currently available do not maintain
low surface-tension upon damage or wear. This irreversible loss reduces the materials
service-life time and raises maintenance efforts and cost. Since the damage can never
be fully avoided, introducing self-repairing mechanisms to recover the chemical/
physical properties is one way to reduce it. Hence, the surface chemistry repair is
critical for a sustainable development and production of low-surface-energy polymer
coatings.
So far, most of the self-healing principles reported focus on mechanical damage
recovery. Surface chemical groups repair has been scarcely addressed. Previously, our
group reported a self-replenishing system which recovers a certain concentration of the
low-surface-energy groups (e.g. fluorinated-dangling ends), upon surface damage.
Currently our focus is to understand and control this self-replenishing process in model
coatings, to optimize the recovery response. A dual approach is being followed
(experimental and modelling) to investigate the influence of several parameters (e.g.
polymer network mobility or network constituents miscibility) on the self-replenishing
behaviour of polymer coatings.
More recently, we started to apply our knowledge on this self-healing system to obtain
self-repairing functional coatings. By combining the self-replenishing principle with the
incorporation of inorganic nanoparticles, we designed robust superhydrophobic
self-replenishing coatings. The rough surfaces of these coatings have low-surfaceenergy
groups, which can reorient towards new surfaces, created upon damage. Our
last developments on these superhydrophobic coatings, with a well-defined surfacestructure
and self-repairing chemistry, will be presented.

14.50 uur Pauze

15.20 uur Lezing in het Nederlands
Advances in high-throughput and (local) electrochemical evaluation of self
healing coating performance
Dr. Arjan Mol (Delft University of Technology Department of Materials Science and
Engineering)
Self healing of anti-corrosive coatings can be achieved by the release of active
corrosion inhibitors and/or autonomous restoration of the barrier properties by polymer
healing upon damage. The nature and kinetics of the inhibitor release and the polymer
healing kinetics are crucial in the overall protection efficiency provided by these self
healing concepts. This presentation deals with recent advances in the use of highthroughput
testing as well as macroscopic and local electrochemical probe techniques
for the evaluation of the individual and combined performance of inhibitor and polymer
healing based concepts.

15.55 uur Lezing in het Nederlands
Novel approaches to self-healing materials
Prof. Dr. Rint Sijbesma (TU Eindhoven, Department of Polymer synthesis, mechanically
induced catalyses)
Two approaches to self healing in polymeric materials will be presented. One makes
use of the reversibility of hydrogen bonds in supramolecular polymers to provide the
mobility required to prevent and heal cracks. The second approach uses mechanical
stimuli to acitvate latent polymerization catalysts embedded in the material . The
catalysts are inactive in the absence of stresses , while upon mechanical activation
they efficiently polymerize monomer or crosslinkable dangling groups.

16.30 uur Sluiting, hapje, drankje