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Diversified α-phase nanostructure of isotactic polypropylene under cylindrical confinement via cross diffraction analysis

Zeng, Xingming; Zhang, Shuailin; Zheng, Nan; Yu, Shichen; Li, Xiaoguang; Ageishi, Masaki; Lotz, Bernard; Liu, Gengxin; Cao, Yan

By 25 November 2019No Comments

Polymer, 2019, vol 179pp. 121647



Understanding polymer nanostructures is a prerequisite to manipulate their physical properties. Molecular self-assembly under confinement effectively generates novel polymer nanostructures. However, in one confined system, diffraction signals of different nanostructures are merged in a typical two-dimensional (2D) wide-angle X-ray diffraction (WAXD) measurement. For comparison, selected-area electron diffraction (SAED) of transmission electron microscopy can precisely capture the “local” diffraction signal of an individual nanoscale entity. Here, using isotactic polypropylene (i-PP) as a model polymer, we have demonstrated a cross-analysis of global X-ray and local electron diffraction results to fully reveal the structural details of i-PP nanorods. For the first time, we have decomposed completely the “mixed” 2D WAXD patterns of i-PP nanorods into five types of α-phase nanostructures: (a). Left-tilted daughter crystals; (b) Right-tilted daughter crystals; (c) Double-tilted daughter crystals; (d) a*-axis oriented crystals; (e) b-axis oriented crystals.

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