Figure 8: DSC trace for ipp isothermal crystallized from the melt at a- 140°C for 18 hours then heated directly to 200°C at scan rate 10°Cmin-1 b-Tc=140°C for 18 hours then annealed at 155°C for one 10 hour then heated to 200°C at scan rate 10°Cmin-1 c- Tc=140°C for 18 hours then annealed at 160°C for one hour then heated to 200°C at scan rate 10°Cmin-1.