Effect of organoclay on thermal and dynamic mechanical properties of novel thermoplastic polyurethane nanocomposites prepared by melt intercalation technique

Abstract

Polymer nanocomposites based on thermoplastic polyurethane (TPU) containing organophilic montmorillonite (OMMT) were prepared by melt compounding method followed by compression molding. Different percentage of organically modified nanoclays (1, 3, 5, 7, and 9 wt%) was incorporated into the TPU matrix in order to examine the influence of the nanofillers on nanophase morphology and materials' properties. The microstructure morphology of the nanocomposites was examined by transmission electron microscopy (TEM), energy dispersion X-ray analysis (EDX), wide angle X-ray diffraction (WAXD), and atomic force microscope (AFM). The observation established that the organoclay is homogeneously dispersed and preferentially embedded in the TPU soft segment phase. Significant enhancement in the thermal stability of the nanocomposites was observed with the addition of the OMMT under thermogravimetric analysis (TGA). Dynamic mechanical properties of the TPU nanocomposites were analyzed using a dynamic mechanical thermal analyzer (DMTA), which confirms that the addition of OMMT has a strong influence on the storage and loss modulus of the TPU matrix.View this article online at wileyonlinelibrary.com EFFECT OF ORGANOCLAY ON TPU NANOCOMPOSITE Figure 12. Cole-Cole plot (plot of E 0 vs. E 00 ) of the pure TPU and TPU nanocomposites as a function of (a) temperature, (b) strain amplitude, and (c) frequency.View this article online at wileyonlinelibrary.com

Effect of nanoclay on the mechanical, dynamic mechanical and thermal properties of cyanate ester syntactic foams

“…However, some amount of the nanoclay will be in the exfoliated state, which cannot be quantified using X-ray diffraction technique alone. Similar results of intercalation have been observed for Cloisite 30B-and Nanofil 919-based nanocomposites [19][20][21].…”

“…13. The semicircular nature of cole-cole curve is indicative of homogeneous morphology, whereas two phase systems show two modified circles [12,20]. In the present case, semicircular nature of the curves implies that the syntactic foam and the nanoclay reinforced systems are homogeneous.…”

“…The thermal decomposition of Cloisite 30B takes place in two stages. The first stage decomposition at around 200 • C refers to the evolution of absorbed water and gaseous species; the second stage between 200 and 500 • C is due to the evolution of organic constituents [20]. The TG curves and the DTG curves for the syntactic foams are illustrated in Figs.…”

Mechanical, thermal, barrier, and rheological properties of poly(ether‐block‐amide) elastomer/organoclay nanocomposite prepared by melt blending

“…Melt compounding processes using conventional high shear mixers have been regarded as an efficient way to fabricate polymer‐clay nanocomposites, especially effective for polar thermoplastics and thermoplastic elastomers such as nylons [13–15], polyesters [16–18], polyetherimide [19], and thermoplastic polyurethane [20, 21]. In the melt compounding process, the polymer chains diffuse into the galleries of the clay under a strong shear field if proper thermodynamic compatibility between the polymer and surface of the organoclay is provided.…”

High‐performance hydrogenated nitrile butadiene rubber composites by in situ interfacial design of nanoclays

“…However, in order to achieve exfoliation/intercalation of layered clays, some sophisticated operations, e.g. the solvent mixing method and the latex co‐coagulation technique, have been conducted, which greatly increase the fabrication cost and uncertainty of the performance . Thus, it becomes an urgent need to exploit the potential capacity of exfoliated nanoclays in reinforcing rubber, i.e.…”