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By Bancroft W. D.

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Bhowmick et al. decreases, which is due to formation of agglomerated clay structures that make homogeneous dispersion difficult. The authors have established a good correlation between mechanical properties and morphology. The incorporation of unmodified and organically modified montmorillonite nanoclays (namely 15A and 30B) in chlorinated polyethylene (CPE) by the solution intercalation method and their influence on mechanical properties of the nanocomposites have been studied by Kar et al. [137].

On chemical modification, 15A registered a 146% increase in modulus and 303% in tensile strength, while CNF showed 150% increment in modulus and 113% in tensile strength of the nanocomposites over the gum. Recently, Mitra et al. have prepared chemically crosslinked nanosized gels from different rubber lattices [148, 149]. When added in small quantity (2–16 phr), these low moduli deformable gels have been found to influence the mechanical properties of virgin elastomers like NR and SBR considerably.

45 nm, respectively. Of special interest is the fact that all the samples that were latex-blended (NLUNA, NLPNA, and NMNA) exhibit high degrees of exfoliation when swollen for 72 h. Morphology evolution is thus found to be dependent on the processing technique applied to disperse the nanoparticles. The latex-blended and prevulcanized nanocomposites show predominant exfoliation with some intercalation, especially in uncured and prevulcanized samples. In conventionally cured but latex-blended nanocomposites, realignment of NA particles is visible, with a greater tendency of NA platelets towards agglomeration.

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