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The thermal stability and degradation behavior of polypropylene (PP) particles having diameter varying from few micrometers to nanometers were studied by thermogravimetric analysis (TGA). The PP particles of average diameter ∼20μm, ∼10μm, ∼5μm, ∼1μm and <500nm were studied over a range of temperature from 25 to 600°C in N₂ atmosphere and heating rates of 5, 10 and 15°C/min. Thermal stability of PP particles initially decreases and then increases as particle size further decreases to nanometer scale. The five single heating rate techniques such as Friedman, Freeman–Carroll, Chang, Coats–Redfern and second Kissinger; and three multiple heating rate techniques such as the first Kissinger, Kim–Park and Flynn–Wall were used to compute the kinetic parameters of degradation reaction, e.g., activation energy (E_a), order of reaction (n) and frequency factor [ln(Z)]. The lifetime of macro-, micro- and …