By Anil N. Netravali, K. L. Mittal
Significant study has been performed in polymeric nanocomposites and development has been made in figuring out nanofiller-polymer interface and interphase and their relation to nanocomposite properties. notwithstanding, the data is scattered in lots of varied book media. this can be the 1st ebook that consolidates the present wisdom on realizing, characterization and tailoring interfacial interactions among nanofillers and polymers by means of bringing jointly top 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 sensible homes of nanocomposites, characterization and modelling of the interphase
- Effects of crystallization at the interface, chemical and actual suggestions for floor amendment of nanocellulose reinforcements
- Electro-micromechanical and nanoindentation innovations for interface assessment, molecular dynamics (MD) simulations to quantify filler-matrix adhesion and nanocomposite mechanical properties.
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Additional resources for Interface / Interphase in Polymer Nanocomposites
Example text
In the following section we provide a wide perspective of interfacial structure, by drawing examples from system-specific studies in the literature. 2 Effects of Particle Size The interface structure is impacted by both interface thermodynamics as well as the size of the nanoparticle compared to the polymer matrix. In the regime where the nanoparticle radius, R, is similar in size or significantly smaller than the radius of gyration, Rg, of the polymer, there is a strong excluded volume effect (refers to the idea that one polymer chain cannot occupy space that is already occupied by other chains) [101, 102], and if the enthalpic interactions are favorable, the nanofillers can act essentially as a good solvent and swell the matrix [103].
A qualitative agreement between the predicted and experimentally observed morphologies is seen. the positive interfacial tension, leading to “autophobic dewetting” [87, 88]. The allophobic and autophobic transitions have been experimentally monitored by Sunday et al. [85], using PS-grafted SiO2 NPs with a full range of higher graft densities. One of the most important conclusions of their measurements is that the window between allophobic dewetting and autophobic dewetting diminishes at higher matrix to brush molecular weight ratio (P/N), which is consistent with previous theoretical and experimental studies [4, 15, 85].
This process has been shown to produce valid results while allowing for the evaluation of a much wider parameter space [183]. Here the properties and physical extent of the interface are again closer to the reality indicated in direct measurements compared to the results from analytical models. Using statistical reconstructions allows for experiments to examine parameters outside of the range of tested values, and allows for the investigation of loading or dispersion state without laborious repeated experimental effort.