Systematic study of interfacial interactions between clays and an ionomer

Abstract

To study the interfacial interactions between an ionomer [poly(ethylene-co-acrylic acid) neutralized by zinc salts (PI)] and clays, PI-clay nanocomposites were prepared using a solution method. Two types of commercially available montmorillonite clays respectively K10 and KSF were used, and were modified with organic modifiers with chain lengths of 12-18 carbons. The interactions between the PI, clays, and modifiers were evaluated through study of the structure, morphology, and properties of the PI-clay nanocomposites. We found that the modifiers were successfully intercalated into the clay layers (Fourier transform infrared spectroscopy). The clay modified with a long-chain agent showed an exfoliated nature in the nanocomposite. The thermal stability and storage modulus of PI were improved greatly by the addition of the clays, especially when the long-chain modifier was used (thermogravimetric analysis and dynamic mechanical analysis). The differential scanning calorimetry results show that clay layers are inserted into the clusters because of solvent-directed morphological evolution, so the transition of the ionic domains and the crystallinity of PI are changed. The interaction between PI, the modifier, and the silicate layer played an important role in the determination of the properties of the nanocomposites.

Synthesis of silver/montmorillonite nanocomposites using γ-irradiation

“…Broad peak was due to the presence of van der Waals interactions between the hydroxyl groups of MMT layers and the partial positive charge on the surface of Ag-NPs. 65 These peaks, with the …”

Application of Green Synthesized MMT/Ag Nanocomposite for Removal of Methylene Blue from Aqueous Solution

“…For instance, the IR band at 918 cm −1 moved slightly to 914 cm −1 with an enhanced intensity, which indicates an increase in the mass of the molecules due to silver nanoparticles-MMT clay interaction. The MMT/Ag nanocomposite spectra showed a new absorption band near 3150 cm −1 , which is an indication of the interaction between silver nanoparticles and the O-H functional group in the MMT layers [29,41].…”

Ionic nanocomposite networks in poly(styrene‐co‐methacrylic acid) copolymers with calcium carbonate

“…The fact that these two samples are more filled than the others can explain this observation: the big calcium-carbonate aggregates can hinder the cluster formation by inserting in the cluster phase. [28][29][30][31] The PS (0.7) peak extends from 3.8 to 4.3 2h range, i.e. 20.5 to 23.2 Å .…”

“…Most of them treat the plasticizing and filling effects of functional organic salts. [28][29][30][31] Even if this field has been developed in the last years, most of the studies are about ionomeric rubber, and the ionic effect of the fillers is investigated only to achieve a better dispersion. Thus, they introduce more free volume to the cluster regions without affecting the amount of the cluster regions.…”

“…They observe that the nanocomposites exist in both the non-ionic matrix and in the ionic cluster, due to the polar groups at the surface of the particles. [28][29][30][31] Even if this field has been developed in the last years, most of the studies are about ionomeric rubber, and the ionic effect of the fillers is investigated only to achieve a better dispersion. [32][33][34][35] In the case of calcium carbonate, it is known that the presence of the acid functions along the copolymer chains permits a strong interaction with CaCO 3 particles and their exfoliation in the matrix.…”