Thermal and Rheological Behavior of Polymer Grafted Nanoparticles

• DOI: 10.1021/acs.macromol.5b00987
• Publication Date: 2015-11-23T17:19:39Z
• Authors: Daniel F. Sunday; David L. Green
• Keywords: Particle (ecology)

Composite materials consisting of nanoparticles dispersed in a polymer matrix have potential applications wide range fields. Grafting chains to is key strategy for controlling the distribution those throughout material. The particle controlled by relative length (P) graft (N) and density (σ) particles given radius (R). Using differential scanning calorimetry (DSC) bulk rheological measurements, we examine interactions between as function three parameters: σ, P, N. results these measurements are compared ultrasmall-angle X-ray scattering (USAXS) [Macromolecules 2012, 45, 4007−4011], which were used determine phase behavior particles. DSC indicate that must be completely expelled from layer autophobic transition occur. Similar trends observed where extracted thickness correlates changes glass temperature DSC. Additional demonstrate differences flow sparsely densely grafted over shear rates. In particular, increases high levels (0.5–0.7 chains/nm2), well-dispersed aggregated becomes increasingly similar, particle–particle screened thick layer.