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On the basis of research method in FTIR imaging, we made a heterogeneous thin film of isotactic polypropylene(i PP) that contains a few large spherulites(~150 μm) which are surrounded by small spherulites(~15 μm) for tensile testing. The evolution processes of crystalline and amorphous orientations of i PP are monitored with its characteristic peaks at 998 and 973 cm-1, respectively. By introducing the correlation images, the analysis demonstrates the relationships between the orientation evolutions of crystalline and amorphous phases in a space of 250 μm× 250 μm detecting area. During the plastic deformation, crystalline orientation is higher than amorphous orientation outside the large spherulite, while that is opposite inside the region. In addition, the evolutions of crystalline and amorphous orientations almost keep a positive correlation.
On the basis of research method in FTIR imaging, we made a heterogeneous thin film of isotactic polypropylene (i PP) that contains a few large spherulites (~ 150 μm) which are surrounded by small spherulites (~ 15 μm) for tensile testing. The evolution processes of crystalline and amorphous orientations of i PP are monitored with its characteristic peaks at 998 and 973 cm -1, respectively. By introducing the correlation images, the analysis demonstrates the relationships between the orientation evolutions of crystalline and amorphous phases in a space of 250 μm × 250 μm detection area. During the plastic deformation, crystalline orientation is higher than amorphous orientation outside the large spherulite, while that is opposite from inside the region. In addition, the evolutions of crystalline and amorphous orientations almost keep a positive correlation.