morphology of TPU-nanocomposite; thermal stability of TPUs by TGA analysis; chain-stripping reactions of PVC by organoclays; time for HCl release of flexible PVC compounds with 5 phr organoclay by direct blending route; time for HCl release of flexible PVC compounds with 7.4 phr organoclay by masterbatches routes; fire performance index of TPUs; mass losses at different temperatures for the organoclays 1 and 4; TGA in air, 20°/min heating rate