Reaction model PHB pure PHB/CNC (1%) PHB/CNC (3%) PHB/CNC (5%)   E E E E First order (F1) 108 83.3 118 83.2 Second order (F2) 152 121 174.6 117.6 Phase boundary controlled (R2) 91 70.2 104 71 Phase boundary controlled (R3) 96.4 74.3 110 76.2 Power Law (P4) 117.6 91.4 133 93.3

Table 4: Activation energy values evaluated from Coats Redfern method using five reaction models for pure PHB and PHB nanocomposites.