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The crystallization behavior of partially melting isotactic polypropylene (iPP) has been carefully examined by the differential scanning calorimetry (DSC) and polarized light microscopy. The experimental results show that the unmelted material can accelerate the primary nucleation rate and the ordered structure of polymer melt can speed up the linear growth rate of spherulite, so the crystallization...
The in situ Fourier transform infrared spectroscopic study of isotactic polypropylene (iPP) shows that a structure change occurs at about 135°C. Some experimental results suggest that this structure change may result from the disordering of helical sequences in the non-crystalline region, which can be further confirmed by the in situ infrared observation of chloride polypropylene (Cl-PP). If the iPP...
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