Particle adhesion and imaging of particle/surface contact zone
2011 (English)In: 25th ECIS (European Colloid and Interface Society meeting), 2011Conference paper (Other academic)
The awareness of our need for a sustainable society has encouraged the search for renewable, high quality materials that can replace oil-based products. This has stimulated alternative research where cellulosic fibres are combined with different types of polymer matrices to obtain more environmentally friendly composite materials. However, the compatibility between the different components in a composite, which is imperative for the properties of the composite, is a large problem in many systems today. In this work, the objective is to evaluate an amphiphilic block copolymer with one high molecular weight hydrophobic block (polystyrene, PS) and one cationic block (poly(di¬methyl-amino)ethyl methacrylate, PDMAEMA), to be used as a compatibilizer between fibres and non-polar polymer matrices in fibre-reinforced composites. The purpose is both to affect the surface energy and to introducing polymer entanglement at the interface. The AFM colloidal probe technique was used to measure the adhesion which is acting in the present work. The adhesive force of a non-polar PS probe towards a surface covered with preadsorbed compatibilizer increased with increasing contact time, due to polymer entanglements between the non-polar blocks at the treated surface and the probe. Also the contact-zone between PS particles and compatibilizer surface was imaged with AFM. This was done by carefully removing pre-adhered PS particles with the aid of AFM cantilevers that was glued onto the particle in-situ followed by pulling. This also enables imaging of the contact zone on both the compatibilizer surface and on the PS particle.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-84395OAI: oai:DiVA.org:kth-84395DiVA: diva2:499288
25th ECIS (European Colloid and Interface Society meeting). Berlin, Germany. 4-9 September 2011
QC 201203302012-02-132012-02-132012-03-30Bibliographically approved