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Meeting MS&T23: Materials Science & Technology
Symposium 2023 Undergraduate Student Poster Contest
Presentation Title Rheological Analysis of Flow-induced Crystallization of Isotactic Propylene: Examining Temperature Variations and Specific Work Effects
Author(s) Jongkyeong Kim, Benson Jacob, Ralph H Colby
On-Site Speaker (Planned) Jongkyeong Kim
Abstract Scope This research aims to gain a deeper understanding of flow-induced crystallization in isotactic polypropylene (iPP) by investigating the effects of shear flow at elevated temperatures. By employing various analytical techniques, it seeks to elucidate the underlying mechanisms and provide valuable insights into the complex behavior of semicrystalline polymers under flow conditions. The study uses a rotational rheometer to dynamically monitor the flow-induced nucleation kinetics and the onset of crystallization in the melt under weak flow conditions. Rheology, along with ex-situ small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS), is employed to investigate how temperature changes affect crystal formation and stability. In addition to assessing flow-induced crystallization, the research also investigates changes in chemical orientations and degree of crystallinity by coupling ex-situ Fourier-transform infrared (FTIR) and Raman spectroscopy.

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