Assessing organo-clay dispersion in polymer layered silicate nanocomposites: A SAXS approach

The effect of a synthetic double layer hydroxide on the rate of II→I phase transformation of poly(1-butene)

“…A quantitative estimation of the average size of the clay stacks was performed by fitting procedures of the SAXS traces. On the basis of theoretical models which are functions of the morphological features of tactoids, calculated SAXS spectra were generated to reproduce experimental ones, allowing an evaluation of the mean number of layers, their spacing and distribution [22]. The fitting showed that the average number of layers per each intercalated stack was about 5 for all the composites, indicating a significant degree of interaction between polymer and filler.…”

Quantification of organoclay dispersion and lamellar morphology in poly(propylene)–clay nanocomposites with small angle X-ray scattering

“…, representing a third population consisting of intercalated clay tactoids [53]. Interestingly, Lorentz corrected curves of ICP-NC2 did not show any signal from nanoclay tactoids, and could be considered truly indicative of complete exfoliation of nanoclay in this particular ICP based nanocomposite.…”

“…11. Though dependence of physical properties on number of clay layers and existence of different organoclay populations in the nanocomposites have been reported [50,51,53], above plot provides a direct correlation of N as a key structural parameter translating to material performance. With decrease in N, percentage change shift from negative to positive axis could be seen, with N ¼ 1 resulting in improvement of impact by 40%.…”

“…This approach was demonstrated by Causin et al for the quantification of organoclay dispersion in polypropylene and poly(butene) [49][50][51]53,54]. Influence of additives and processing conditions on extent of nanoclay dispersion was explained with quantitative data such as the number of clay layers, interlayer spacing and its distributions.…”

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

“…1 The use of inorganic nanoparticles with different shapes, e.g, platelets, spheres or tubes, as fillers in a polymer matrix has attracted increasing interest owing to the attractive properties arising from their small size and large aspect ratios, with applications in structural engineering, drug delivery, etc. 2,3 These polymer nanocomposites can be produced by different methods such as in situ polymerization, 4,5 where the polymerization is performed in the presence of nanoparticles; melt blending, [6][7][8] where a polymer is blended with nanoparticles and then annealed at a temperature above the glass transition temperature of the polymer to form the nanocomposite; or solution blending, [9][10][11] where the blending of polymer and nanoparticles is performed in a suitable solvent. For the production of waterborne nanocomposites for application as paints, coatings and adhesives, two main methods have been reported: (1) emulsion mixing and (2) in situ polymerization in suspension, 12 emulsion [13][14][15][16] and miniemulsion.…”