Crystallization and dissolution of flow-induced precursors

Luigi Balzano; Nileshkumar Kukalyekar; Sanjay Rastogi; Gerrit W.M. Peters; John C. Chadwick

doi:10.1103/PhysRevLett.100.048302

Crystallization and dissolution of flow-induced precursors

Luigi Balzano, Nileshkumar Kukalyekar, Sanjay Rastogi, Gerrit W.M. Peters, John C. Chadwick

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187 Scopus citations

Abstract

We make use of a specially synthesized linear high density polyethylene with a bimodal molecular weight distribution (MWD) to demonstrate that it is possible to produce a suspension of extended-chain (shish) crystals only. Such a suspension can be generated at high temperatures, above but close to the equilibrium melting temperature of the unconstrained extended-chain crystals (Tm0=141.2°C) and requires stretch of the longest chains of the MWD. After the application of a shear flow of 120s-1 for 1 s at 142°C, x-ray scattering suggests the presence of a large number of metastable needlelike precursors with limited or no crystallinity. Precursors that are too small dissolve on a timescale that correlates perfectly with the reptation time of the longest polymer molecules. Whereas, precursors that exceed a critical size crystallize forming extended-chain shishes. © 2008 The American Physical Society.

Original language	English (US)
Journal	Physical Review Letters
Volume	100
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.100.048302
State	Published - Feb 1 2008

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abstract = "We make use of a specially synthesized linear high density polyethylene with a bimodal molecular weight distribution (MWD) to demonstrate that it is possible to produce a suspension of extended-chain (shish) crystals only. Such a suspension can be generated at high temperatures, above but close to the equilibrium melting temperature of the unconstrained extended-chain crystals (Tm0=141.2°C) and requires stretch of the longest chains of the MWD. After the application of a shear flow of 120s-1 for 1 s at 142°C, x-ray scattering suggests the presence of a large number of metastable needlelike precursors with limited or no crystallinity. Precursors that are too small dissolve on a timescale that correlates perfectly with the reptation time of the longest polymer molecules. Whereas, precursors that exceed a critical size crystallize forming extended-chain shishes. {\textcopyright} 2008 The American Physical Society.",

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AU - Balzano, Luigi

AU - Kukalyekar, Nileshkumar

AU - Rastogi, Sanjay

AU - Peters, Gerrit W.M.

AU - Chadwick, John C.

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AB - We make use of a specially synthesized linear high density polyethylene with a bimodal molecular weight distribution (MWD) to demonstrate that it is possible to produce a suspension of extended-chain (shish) crystals only. Such a suspension can be generated at high temperatures, above but close to the equilibrium melting temperature of the unconstrained extended-chain crystals (Tm0=141.2°C) and requires stretch of the longest chains of the MWD. After the application of a shear flow of 120s-1 for 1 s at 142°C, x-ray scattering suggests the presence of a large number of metastable needlelike precursors with limited or no crystallinity. Precursors that are too small dissolve on a timescale that correlates perfectly with the reptation time of the longest polymer molecules. Whereas, precursors that exceed a critical size crystallize forming extended-chain shishes. © 2008 The American Physical Society.

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JO - Physical Review Letters

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Crystallization and dissolution of flow-induced precursors

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