Mechanical and thermomechanical properties of polycarbonate-based polyurethane-silica nanocomposites

0364732 - ÚMCH 2012 RIV CS eng J - Journal Article
Poreba, Rafal - Špírková, Milena - Hrdlička, Z.
Mechanical and thermomechanical properties of polycarbonate-based polyurethane-silica nanocomposites.
Processing and Application of Ceramics. Roč. 5, č. 3 (2011), s. 155-159. ISSN 1820-6131. E-ISSN 2406-1034
R&D Projects: GA ČR GAP108/10/0195
Institutional research plan: CEZ:AV0Z40500505
Keywords : fumed silica * polycarbonate diol * nanocomposites
Subject RIV: CD - Macromolecular Chemistry
http://www.tf.uns.ac.rs/publikacije/PAC/pdf/PAC%2013%2004.pdf

In this work aliphatic polycarbonate-based polyurethane-silica nanocomposites were synthesized and characterized. The influence of the type and of the concentration of nanofiller differing in average particle size (7 nm for Aerosil 380 and 40 nm for Nanosilica 999) on mechanical and thermomechanical properties was investigated. DMTA measurements showed that Nanosilica 999, irrespective of its concentration, slightly increased the value of the storage shear modulus G’ but Aerosil 380 brings about a nearly opposite effect, the shear modulus in the rubber region decreases with increasing filler content. Very high elongations at break ranging from 800% to more than 1000%, as well as high tensile strengths illustrate excellent ultimate tensile properties of the prepared samples. The best mechanical and thermomechanical properties were found for the sample filled with 0.5 wt.% of Nanosilica 999.
Permanent Link: http://hdl.handle.net/11104/0200134