A longstanding goal in polymer rheology is to develop a physical picture that relates the growth of mechanical moduli during polymer crystallization to that of structure.  A major roadblock in this endeavor has been the inability to perform simultaneous measurements of the crystallinity and the mechanical moduli during the crystallization process.  Here we describe our recently developed hybrid rheo-Raman-microscope and use it to construct crystallinity-modulus relationships.  In the high nucleation density regime, we use Raman and rheology to show that the kinetics is well described by suspension model with a percolation transition.   In the low nucleation density regime, we find via optical microscopy and rheology that finite size effects become critical.  The optical microscopy further reveals that the structural unit causing percolation is the growth of spherulites into a superstructure.  We aim to develop a universal description of this process by considering two scaled parameters; one related to bulk nucleation density and the other to surface nucleation. <br/>

Rheology of crystallizing polymers: Towards a universal description

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.