Abstract
In this work, the formation of flow-induced precursors (FIPs) during and immediately after applying a shear flow in isotactic polypropylene (iPP) melt is studied at high spatial resolution and high time resolution with a high-speed polarized optical microscope (HSPOM) and simultaneous small/wide-angle X-ray scatterings (SAXS/WAXS). A number of studies have reported the formation of FIPs in the early stage of flow-induced crystallization. However, reports on direct observations of the formation of precursors during shearing are scarce. We find that FIPs are observed using HSPOM after a certain incubation time during shearing. After cessation of flow, some FIPs dissolve gradually and others transfer to crystals. This suggests a competition between chain relaxation and crystallization. In SAXS measurements, the formation of FIPs during shearing is indicated by weak equatorial streaks normal to the flow direction after a specific incubation time. The intensity integrated from 2D SAXS images shows a sudden dec...
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