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SUMMARY:Flow-Induced “Shish-kebab” Formation: A New-Scenario of Kineti
 c Pathways for􀀁Entangled Polymer Solutions - Takeji Hashimoto\, Prof. E
 meritus\, Kyoto University\, Kyoto\, Japan
DTSTART:20091116T140000Z
DTEND:20091116T150000Z
UID:TALK21566@talks.cam.ac.uk
CONTACT:Erika Eiser
DESCRIPTION:This work is concerned with general research themes on open no
 n-equilibrium phenomena in statistical mechanics and materials science\, s
 pecifically self-assembly of ordered (the so-called dissipative) structure
 s of molecular systems under external flow fields. To elucidate the self-a
 ssembly under the external fields is crucial both academically to understa
 nd the pattern formation in nature and industrially to create advanced mat
 erials of the next generation. The explorations of the phenomena have been
  recognized to be one of the most important research items in fundamental 
 physical science\, materials science and technology\, and biological scien
 ce.\nThis work clarifies for the first time a whole series of kinetic path
 ways\, for concentrated crystallizable polymer solutions subjected to shea
 r and extensional flows\, which leads to formation of intriguing\, complic
 ated\, but fundamental “shish-kebab” crystalline superstructures. The 
 shish-kebabs\, which have been applied to various important industrial pro
 ducts such as ultrahigh-strength fibers\, were first reported by Pennings 
 et al in 1965. Since then its formation mechanism has been extensively and
  intensively investigated\, as one of the most important and fundamental r
 esearch themes in polymer science by a great number of researchers based u
 pon a concept of the flow-induced crystallization phenomenon. Nevertheless
  the mechanism has not been fully clarified yet. Here we show that the mec
 hanism involves not only the flow-induced crystallization but also the flo
 w-induced phase separation\, at least in the case of polymer solutions\, a
 nd that intricate couplings between the two phase transitions (crystalliza
 tion and phase separation) are crucial for a more profound understanding o
 f the mechanism. We present a new scenario for a series of kinetic pathway
 s on shish-kebab formation in polymer solutions.
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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