ArticleMacromolecules2025
Rigidity Percolation Dictates Rheological Hysteresis Regime in Polypropylene during Crystallization and Melting.
Article in Macromolecules, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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3 authors.
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Abstract
Understanding structure-property relationships during polymer crystallization and melting has been limited by challenges in the simultaneous measurement of crystallinity and rheological properties. Consequently, rheological models overlook the fundamental asymmetry between crystallization and melting processes. Here, we use simultaneous rheology and Raman spectroscopy to directly measure rheological behavior as a function of crystallinity. We find that polypropylene's rheological behavior can differ significantly between crystallization and melting at identical crystallinity values depending on thermal pathway. Using a generalized effective medium (GEM) model, we show that the onset of hysteresis aligns with the calculated percolation threshold. We quantify hysteresis through a normalized hysteresis parameter Δ
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