Importance of Molecular Friction in a Soft Polymer−Nanotube Nanocomposite

Abstract

τ likewise increases with Σ, but then levels off above a critical value. These results are explained by the molecular friction of the adsorbed polymer chains sliding along the rubbery polymer matrix. The results can be used to guide the interfacial design of polymer nanocomposites to obtain ultimate macroscopic mechanical control. In particular, the monomeric friction coefficient, ξ 1 , could be used to adjust the macroscopic properties of this type of nanocomposite.

Colloid‐Assisted Self‐Assembly of Robust, Three‐Dimensional Networks of Carbon Nanotubes over Large Areas

“…Much success has been achieved in their use as interconnects or as functional components in nanoscale devices 6. Despite some success,7–9 utilizing the often‐extraordinary physical and chemical properties in macroscale systems remains a real bottleneck to generalized application. Carbon nanotubes (CNTs) are the quintessential example; numerous reports of their use as fillers in polymeric composites to enhance either mechanical or electrical properties have, for the most part, been disappointing 8.…”

MoS2 Nanoplatelet Fillers for Enhancement of the Properties of Waterborne Pressure-Sensitive Adhesives

“…29,30 Reports of different nanoparticles used for preparation of waterborne PSAs nanocomposites e.g., clay discs (laponite or montmorillonite), carbon nanotubes (multi-walled MWNTs or single-walled SWNT), and graphene, can be found in both the open and patent literature. 15,19,[22][23][24] Improved adhesive properties have been obtained by the use of plate-like fillers, which are of interest in the present work. Crucially, re-arrangement of hard particles in a viscous matrix and the sliding of a viscous matrix along the hard particle surface can both dissipate energy during the deformation of the nanocomposite.…”

“…[17][18][19][20][21] The emulsion mixing method has shown to be the most simple and most effective method, since it consists of a simple blending of an aqueous dispersion of nanoparticles with the latex. 14,[22][23][24] One advantage of this simple method is that the polymer properties can be controlled during their synthesis and not perturbed by the presence of nanoparticles. A second advantage is that mixing at the nanoscale can be achieved, and the larger polymer particles can be used to organise or direct the position of the inorganic nanoparticles.…”

“…[22][23][24][25][26] The adhesive properties of PSAs result from their well-balanced viscoelasticity in which there is viscous dissipation combined with sufficient elasticity. 25,27 debonding; the solid component resists deformation and supports load under shear stress.…”

Design and fabrication of colloidal polymer nanocomposites

“…[131] Yet another example is that a high density of grafted polymer chains on SWNT surfaces leads to more effective interfacial stress transfer and results in a pronounced mechanical reinforcement. [132] Inspired by previous studies of how polymer chain length (N) and density (Σ) at interfaces influence fracture [133][134][135], adhesion [136], and friction [137,138], Wang et al [139] systematically investigated the interfacial control of τ in a soft polymernanotube nanocomposite through the chain length and density of the polymers physisorbed on carbon nanotube surfaces and then located at the nanocomposite interfaces. Figure 14b shows a scheme of physisorbed polymers on the carbon nanotube surface.…”