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Article Dans Une Revue Journal of Applied Polymer Science Année : 2019

Rheological study of quaternary ammonium‐containing star‐shaped polylactic acid

Résumé

Quaternary ammonium-containing star-shaped polylactic acid (PLA-Q) is analyzed in melt rheology and found to follow a clustering behavior. The viscosity of this polymer is largely higher than its analog, of the same structure, without ammonium ions. This difference is attributed to physical interactions taking place between the ammoniums and hindering the flow of the melt polymer. The frequency sweeps of the storage (G′) and loss (G′′) modulus of the melt PLA-Q are achieved at different temperatures and different shearing times. The iso-temperature and iso-time superposition of the resulting curves were achieved using, respectively, a temperature and a time shift factors, this superposition allowed the determination of the flow activation energy; its value corresponds to an ionic process confirming the ionic interactions. When the two shift factors are used simultaneously, a unique master curve of both G′ and G′′ is obtained; this curve follows the Rouse model indicating the presence of two types of ionic associations within the melt polymer: a large number of multiplets having small size and a small number of clusters of larger size.

Domaines

Matériaux
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Dates et versions

hal-03418899 , version 1 (08-11-2021)

Identifiants

Citer

Kedafi Belkhir, Jean‐charles Majesté, Corinne Jegat, Mohamed Taha. Rheological study of quaternary ammonium‐containing star‐shaped polylactic acid. Journal of Applied Polymer Science, 2019, Journal of Applied Polymer Science, 137 (5), pp.48337. ⟨10.1002/app.48337⟩. ⟨hal-03418899⟩
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