Interface / Interphase in Polymer Nanocomposites by Anil N. Netravali, K. L. Mittal

By Anil N. Netravali, K. L. Mittal

Significant examine has been performed in polymeric nanocomposites and development has been made in knowing nanofiller-polymer interface and interphase and their relation to nanocomposite properties.  in spite of the fact that, the data is scattered in lots of assorted ebook media.  this is often the 1st publication that consolidates the present wisdom on realizing, characterization and tailoring interfacial interactions among nanofillers and polymers by way of bringing jointly major researchers and specialists during this box to provide their leading edge research. 

Eleven chapters authored by means of senior topic experts hide subject matters including:

  • Thermodynamic mechanisms governing nanofiller dispersion, engineering of interphase with nanofillers
  • Role of interphase in governing the mechanical, electric, thermal and different practical homes of nanocomposites, characterization and modelling of the interphase
  • Effects of crystallization at the interface, chemical and actual recommendations for floor amendment of nanocellulose reinforcements
  • Electro-micromechanical and nanoindentation recommendations for interface overview, molecular dynamics (MD) simulations to quantify filler-matrix adhesion and nanocomposite mechanical properties.

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Additional info for Interface / Interphase in Polymer Nanocomposites

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Arrives at values around 70–75 GPa for the interface in a carbon nanotubepolycarbonate composite. This solution is heavily dependent on assumptions for the thickness of the interface modified polymer region, as well as assuming the interface behaves uniformly, rather than in a more realistic but unknown gradient. The calculated increase in modulus is, within an order of magnitude, in agreement with direct measurements, and represents a good first-order approximation at investigating otherwise difficult to measure mechanical properties of the interface.

AFM has also been used to investigate the interface mobility [151, 152]. Scotti and colleagues have used AFM tapping mode analyses to demonstrate that the silica particles were surrounded by a rubber layer immobilized at the particle surface in rubber nanocomposites [152]. Simulation results support the experimental finding and generally find that the mobility of polymer chains in the melt shifts to either higher or lower values based on repulsive or attractive interactions between the polymer and the nanoparticle, respectively.

The enthalpic component in these models was derived based on the earlier work of Vold [79], Vincent et al. [80], and Raghavan et al. 6 (a)). The values of entropic repulsion have been derived from the expression for the brush height, developed by Aubouy et al. [82] and the repulsive energy was estimated based on the equation derived by Milner et al. [83] and Mewis et al. [84]. A phase diagram representing different dispersion states has been proposed. The boundaries between the various phases were identified by balancing the conformational energy per chain plus the enthalpic gain of contact per chain of neighboring phases.

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