Hard and Flexible Nanocomposite Coatings using Nanoclay‐filled Hyperbranched Polymers
2010 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, Vol. 2, no 6, 1679-1684 p.Article in journal (Refereed) Published
The combination of hardness, scratch resistance, and flexibility is a highly desired feature in many coating applications. The aim of this study is to achieve this through the introduction of an unmodified nanoclay, montmorillonite (Na+MMT), in a polymer resin based on the hyperbranched polyester Bottom H30. Smooth and transparent films were prepared from both the neat and the nanoparticle-filled hyperbranched resins. X-ray diffraction (XRD) and transmission electron microscopy (TEM) corroborated a mainly exfoliated structure in the nanocomposite films, which was also supported by results from dynamic mechanical analysis (DMA). Furthermore, DMA measurements showed a 9-16 degrees C increase in Tg and a higher storage modulus above and below the T-g-both indications of a more cross-linked network, for the clay-containing film. Thermogravimetric analysis (TGA) demonstrated the influence of the nanofiller on the thermal properties of the nanocomposites, where a shift upward of the decomposition temperature in oxygen atmosphere is attributed to the improved barrier properties of the nanoparticle-filled materials. Conventional coating characterization methods demonstrated an increase in the surface hardness, scratch resistance and flexibility, with the introduction of clay, and all coatings exhibited excellent chemical resistance and adhesion.
Place, publisher, year, edition, pages
2010. Vol. 2, no 6, 1679-1684 p.
nanocomposites, hyperbranched polymers, montmorillonite, coatings, mechanical properties, thermal properties, barrier properties
IdentifiersURN: urn:nbn:se:kth:diva-13480DOI: 10.1021/am1001986ISI: 000278963600021ScopusID: 2-s2.0-77955494744OAI: oai:DiVA.org:kth-13480DiVA: diva2:325538
QC20100618. Uppdaterad från Submitted till Published (20101022).2010-06-182010-06-182010-10-22Bibliographically approved