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Dispersion, Depletion, and Bridging of Athermal and Attractive Nanorods in Polymer Melt

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Title Dispersion, Depletion, and Bridging of Athermal and Attractive Nanorods in Polymer Melt
 
Creator SANKAR, UK
TRIPATHY, M
 
Subject MOLECULAR-DYNAMICS SIMULATION
INTEGRAL-EQUATION THEORY
CARBON NANOTUBES
PHASE-BEHAVIOR
ELECTRICAL-CONDUCTIVITY
NANOPARTICLE DISPERSION
PERCOLATION THRESHOLDS
MONTE-CARLO
NANOCOMPOSITES
COMPOSITES
 
Description We report a detailed theoretical study of polymer nanorod composites using integral equation theory. The miscibility criteria for small amounts of nanorods in a dense polymer melt have been predicted for various polymer adsorption strengths, nanorod thicknesses, smoothnesses, and aspect ratios, for both athermally interacting and attractive rods. Close comparisons with the nanosphere limit have been made. We find that nanorods exhibit the same kinds of depletion, dispersion, bridging, and telebridging behavior previously predicted for spherical particles. However, the limits of these behaviors are a close (and sometimes nonmonotonic) function of aspect ratio, surface roughness, and nanorod thickness. The miscible region between depletion-driven phase separation and bridging driven phase separation quickly narrows with increasing aspect ratio and remains roughly constant as the nanorod radius of gyration exceeds that of the polymer. This miscible window narrows more quickly in the case of attractive rods. The polymer-mediated attractive forces between athermal rods scale with nanorod diameter, in both the bridging and depletion regimes. Telebridged structures are predicted when the range of polymerparticle attractions approaches the polymer thickness, i.e., the monomer diameter.
 
Publisher AMER CHEMICAL SOC
 
Date 2016-01-15T06:32:13Z
2016-01-15T06:32:13Z
2015
 
Type Article
 
Identifier MACROMOLECULES, 48(2)432-442
0024-9297
1520-5835
http://dx.doi.org/10.1021/ma501292d
http://dspace.library.iitb.ac.in/jspui/handle/100/17940
 
Language en