Publication: Effect of surface modification of colloidal silica nanoparticles on the rigid amorphous fraction and mechanical properties of amorphous polyurethane-urea-silica nanocomposites
Program
KU Authors
Co-Authors
Oguz, OÄuzhan
Candau, Nicolas
Bernhard, Stephane H. F.
Heinz, Ozge
Stochlet, Gregory
Plummer, Christopher J. G.
MenceloÄlu, Yusuf Z.
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Abstract
Colloidal silica nanoparticles (NPs) modified with eight different silane coupling agents were incorporated into an amorphous poly(tetramethylene oxide)-based polyurethane-urea copolymer matrix at a concentration of 10 wt % (4.4 vol %) in order to investigate the effect of their surface chemistry on the structure-property behavior of the resulting nanocomposites. The rigid amorphous fraction (RAF) of the nanocomposite matrix as determined by differential scanning calorimetry and dynamic mechanical analysis was confirmed to vary significantly with the surface chemistry of the NPs and to be strongly correlated with the bulk mechanical properties in simple tension. Hence, nanocomposites with an RAF of about 30 wt % showed a 120% increase in Young's modulus, a 25% increase in tensile strength, a 15% decrease in elongation at break with respect to the neat matrix, which had no detectable RAF, whereas nanocomposites with an RAF of less than 5% showed a 60% increase in Young's modulus, a 10% increase in tensile strength and a 5% decrease in the elongation at break.
Source
Publisher
Wiley
Subject
Polymers, Polymerization
Citation
Has Part
Source
Journal of Polymer Science Part A-Polymer Chemistry
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DOI
10.1002/pola.29529