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Molecular weight (M) dependence of the lateral growth rate (V) of α form crystal of isotactic polypropylene (iPP) was studied. Reliable equilibrium melting temperature determined in our previous study was used for the analysis of supercooling dependence of V. A power law of M of V, V∝Mn−H, was obtained, where H is a small constant (H=0.7). The small H, which is similar to that of the hexagonal phase...
A second-order phase transition of α2 form isotactic polypropylene (iPP) is found at high annealing temperature (Ta=159.3°C) by means of X-ray diffraction method. Although the lattice shape and the space group keep the same as those of the α2 form, i.e. monoclinic and P21/c, with increase of Ta, it has been revealed that there are discontinuous increases in the slopes of the lattice constants a and...
The isotacticity dependence of the spherulitic morphology of isotactic polypropylene (iPP) with high isotacticity between 98.9% and 99.8% in isotactic pentad fraction ([mmmm]%) was studied. Conventional iPP with low isotacticity, [mmmm] = 93.5%, was used as a reference. Isothermal crystallization was carried out at 125°C-150°C. Morphological observations were carried out by polarizing optical microscopy...
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