Fig. 7
HRR a, THR b, SPR c, and TSR d versus time curves of pure flexible PVC and PVC-matrix composites obtained from cone calorimetry test at 35 kW m−2. The HRR curve of TNTs-filled PVC contains a second peak around 230 s, which means that the char is unstable and can be destroyed easily. The TNTs/GO inhibited the second heat release peak, and with 2.5% content, the pHRR value is 282.4 kW m−2, a reduction by 20.5% in comparison with that of neat PVC. This indicates that the char on the surface of the TNTs/GO-filled PVC composites is very stable and can act as a physical barrier to hinder the transmission of heat