process. Then, with the curve of ln[(dH/dt)/(HM0)] versus inversetemperature T−1and liner regression of this curve, a straightline can be got, as shown in Fig. 4. The apparent activationenergy and frequency factor of cotton sample can be ultimatelyobtained as Ea= 120.2 kJ mol−1and A = 1.59 × 1010, which indi-cates that, in this condition, probability of chemical reactionduring a collision is 1.59 × 1010and cotton sample needs energy0.002550.002500.002450.002400.002350.00230