Thermoplastic polyurethane/(organically modified montmorillonite) nanocomposites produced by in situ polymerization

Abstract

Abstract.A series of polyurethane nanocomposites were synthesized from thermoplastic polyurethanes (with different hard segment ratios) and two types of organically modified montmorillonites (OMMT) -Cloisite ® 10A and Cloisite ® 20A. The thermal behavior was examined by non-isothermal thermogravimetry (TG, DTG), Differential Scanning Calorimetry (DSC) and Dynamic-Mechanical Thermal Analysis (DMTA). The results of X-ray analyses showed that the OMMT produced the intercalated polyurethane nanocomposites. It has been proven that the thermal stability and tensile properties of these new systems were higher when the organoclay was present within the polymer matrix. Moreover, these properties depend on both the OMMT loading and the type of gallery cations of the organically modified montmorillonites.

Enhanced Thermal Stability of Halide Perovskite CsPbX3 Nanocrystals by a Facile TPU Encapsulation

“…When the temperature is higher than 200 °C, the TPU begins to decompose, which is similar to the previous reports. [64,65] Different from unencapsulated CsPbBr 3 QDs and CsPbBr 3 @ Cs 4 PbBr 6 NCs, CsPbBr 3 /TPU film and CsPbBr 3 @Cs 4 PbBr 6 /TPU film only show the characteristic of a decrease in PL intensity, whereas the PL peak does not undergo a blue shift phenomenon as the heating temperature increases (Figure 8a,b). This phenomenon can be attributed to the fact that CsPbBr 3 QDs and CsPbBr 3 @Cs 4 PbBr 6 NCs are tightly wrapped by the TPU with high elasticity, thereby effectively suppressing the lattice dilation caused by the heating process and avoiding the blue shift phenomenon.…”

Influence of the Organoclay Content on the Structure, Morphology, and Surface Related Properties of Novel Poly(dimethylsiloxane)-Based Polyurethane/Organoclay Nanocomposites

“…60 Thus, as a consequence of the presence of organoclay particles in the nanocomposite structure, the crystallization rate of the polyurethane hybrid decreases. Strankowski et al 60 TGA was utilized to study the thermal degradation of pure TPU and TPU-NCs. Figure 7 shows TGA a) and DTG b) thermograms of Cloisite 30B, pure TPU, TPU/C30B-10 and TPU-NCs.…”

Organoclay-polymer nanocomposites

“…Similar to rheological studies of the maleic anhydride modified PP/MMT NCs [13], complex viscosity vs. frequency of TPU/OMMT melt was sharply decreased with the addition of MMT clay due tothe shear thinning effect [19,20]. In a recent study by Strankowski et al [21], TPU/OMMT NCs with improved mechanical, thermal, dynamic mechanical and rheological properties were reported. The effect of OMMT on the TPU matrix containing a different hard-segment concentration was evaluated through different characterization methods.…”