Cycloolefin copolymer/fumed silica nanocomposites

0351366 - ÚMCH 2011 RIV US eng J - Journal Article
Dorigato, A. - Pegoretti, A. - Fambri, L. - Šlouf, Miroslav - Kolařík, Jan
Cycloolefin copolymer/fumed silica nanocomposites.
Journal of Applied Polymer Science. Roč. 119, č. 6 (2011), s. 3393-3402. ISSN 0021-8995. E-ISSN 1097-4628
R&D Projects: GA ČR GA106/09/1348
Institutional research plan: CEZ:AV0Z40500505
Keywords : creep * nanocomposites * polyolefins
Subject RIV: JI - Composite Materials
Impact factor: 1.289, year: 2011

We prepared cycloolefin copolymer (COC)/fumed silica nanocomposites by melt compounding in order to study the effect of the filler dimensions (filler surface area) on the physical properties, with particular attention to their thermal, mechanical, and optical behaviors. Thermogravimetric analysis revealed a positive contribution of silica nanoparticles to the thermal degradation resistance of COC. Dynamic mechanical thermal analysis and quasi-static tensile tests of the nanocomposites evidenced a slight stiffening effect, proportional to the nanofiller surface area, without any reduction in the fracture toughness. The positive effect of the nanoparticles on the viscoelastic, creep and fracture behavior was related to the uniform dispersion of silica aggregates in the matrix. Ultraviolet–visible spectrometry measurements evidenced that the original transparency of neat COC was practically maintained after the addition of silica nanoparticles.
Permanent Link: http://hdl.handle.net/11104/0006162