Spherulitic phase patterns

In situ X-ray examination of crystallizing polyethylene, at high temperature and pressure, then confirmed this proposal in detail, showing that the wide-angle diffraction pattern changed abruptly with the optical texture [ 10]. That corresponding to the spherulitic texture was of the usual orthorhombic form while the new intermediate phase had two-dimensional hexagonal symmetry, with an increased cross-sectional area per chain, but without... 

It is well known that PEO spherulites have a Maltese cross extinction pattern and a veiy fine spherulite texture as observed under POM (Ketabi and Lian, 2012 Choi and Kim, 2004 Xi et al., 2005 Choi, 2004) (refer to Figure 9). Meanwhile, under SEM, the image of pure PEO shows waving smooth and uniform stmeture without any phase separation (Johan et al., 2011). 

FIGURE 9.4 Polypropylene crystallized in the monoclinic a-form consisting of parallel-aligned lamellae (a) reveals a characteristic peak at 0 = 9.3° in its WAXS pattern (b) the lamellae will aggregate and form spherulitic superstructures as shown in a Scanning Force Microscopy phase image (c). 

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