Mechanical Reinforcement in Polymer Melts Filled with Polymer Grafted Nanoparticles

• Published in: Macromolecules Vol. 44; no. 18; pp. 7473 - 7477
• Main Authors: Moll, Joseph F, Akcora, Pinar, Rungta, Atri, Gong, Shushan, Colby, Ralph H, Benicewicz, Brian C, Kumar, Sanat K
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 27-09-2011
• Subjects: Applied sciences; Composites; Exact sciences and technology; Forms of application and semi-finished materials; Polymer industry, paints, wood; Technology of polymers; Viscoelasticity; Nanoparticle; Dispersion degree; Morphology; Mechanical properties; Styrene polymer; Nanocomposite; Experimental study; Silica; Modified material; Graft polymers
• ISSN: 0024-9297; 1520-5835
• DOI: 10.1021/ma201200m

We critically leverage the fact that polymer grafted nanoparticles behave akin to block copolymers to systematically vary nanoparticle dispersion and critically examine its role on the mechanical reinforcement in liquid-polymer-based nanocomposites. The nanoparticles are noncontacting, and we perform rheological measurements 80K above the polymer’s glass transition temperature. Our rheology results unequivocally show that reinforcement is maximized by the formation of a transient, but long-lived, percolating polymer–particle network with the particles serving as the network junctions.