Effect of surface modifier on flow properties of epoxy
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Rheol Acta DOI 10.1007/s00397-014-0783-1
ORIGINAL CONTRIBUTION
Effect of surface modifier on flow properties of epoxy suspensions containing model plate-like nanoparticles Kevin L. White & Peng Li & Haiqing Yao & Riichi Nishimura & Hung-Jue Sue
Received: 26 January 2014 / Revised: 20 March 2014 / Accepted: 26 May 2014 # Springer-Verlag Berlin Heidelberg 2014
Abstract The influence of inter-particle interaction on the rheology of an uncured epoxy containing model α-zirconium phosphate (ZrP) nanoplatelets with aspect ratio of 160 is reported. Epoxy suspensions containing nanoplatelets exfoliated with tetra-n-butyl ammonium hydroxide (TBA), a low molecular weight quaternary ammonium cation, show short-range repulsive potential with weak elastic response at low concentration. At semi-dilute concentrations, the suspensions are solid-like at intermediate frequency and transition to viscous flow for time scales longer than the rotary diffusion process. The weak elasticity at intermediate frequency is attributed to the effect of Brownian motion on the rotational motion of the isolated plates. Suspensions containing nanoplatelets exfoliated with hydrophilic polyetheramine oligomers show similar behaviour to the ZrPTBA system, but shifted to lower concentration. The rheological behaviour is attributed to steric stabilization of the nanoplatelets by extended oligomer brushes with short-range repulsive interactions. For suspensions containing nanoplatelets exfoliated with hydrophobic polyetheramines with shorter length, there is evidence for elastic response on local length scales and the flow
Electronic supplementary material The online version of this article (doi:10.1007/s00397-014-0783-1) contains supplementary material, which is available to authorized users. K. L. White : P. Li : H. Yao : H.
