Molecular Basis of the Shish-Kebab Morphology in Polymer Crystallization

In the rich and long-standing literature on the flow-induced formation of oriented precursors to polymer crystallization, it is often asserted that the longest, most extended chains are the dominant molecular species in the "shish" of the "shish-kebab" formation. We performed a c...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2007-05, Vol.316 (5827), p.1014-1017
Main Authors: Kimata, Shuichi, Sakurai, Takashi, Nozue, Yoshinobu, Kasahara, Tatsuya, Yamaguchi, Noboru, Karino, Takeshi, Shibayama, Mitsuhiro, Kornfield, Julia A
Format: Article
Language:English
Subjects:
Analytical chemistry
Applied sciences
Catalysis
Catalysts
Chains (polymeric)
Crystal morphology
Crystallites
Crystallization
Crystals
Daughters
Deuterium
Exact sciences and technology
Macromolecules
Marking
Materials
Morphology
Organic polymers
Parents
Physicochemistry of polymers
Polymers
Precursors
Properties and characterization
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Summary:In the rich and long-standing literature on the flow-induced formation of oriented precursors to polymer crystallization, it is often asserted that the longest, most extended chains are the dominant molecular species in the "shish" of the "shish-kebab" formation. We performed a critical examination of this widely held view, using deuterium labeling to distinguish different chain lengths within an overall distribution. Small-angle neutron-scattering patterns of the differently labeled materials showed that long chains are not overrepresented in the shish relative to their concentration in the material as a whole. We observed that the longest chains play a catalytic role, recruiting other chains adjacent to them into formation of the shish.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1140132