Pressure-induced structural change of intermediate-range order in poly(4-methyl-1-pentene) melt

High-pressure in situ x-ray diffraction and specific-volume measurements on isotactic poly(4-methyl-1-pentene) melt have uncovered abrupt changes in the pressure dependence of microscopic structure as well as that of macroscopic density. The first sharp diffraction peak of the polymer melt, which is...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2012-02, Vol.85 (2 Pt 1), p.021807-021807, Article 021807
Main Authors: Chiba, Ayano, Funamori, Nobumasa, Nakayama, Kazuya, Ohishi, Yasuo, Bennington, Stephen M, Rastogi, Sanjay, Shukla, Anuj, Tsuji, Kazuhiko, Takenaka, Mikihito
Format: Article
Language:English
Subjects:
Computer Simulation
Models, Chemical
Models, Molecular
Molecular Conformation
Phase Transition
Polyenes - chemistry
Pressure
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Summary:High-pressure in situ x-ray diffraction and specific-volume measurements on isotactic poly(4-methyl-1-pentene) melt have uncovered abrupt changes in the pressure dependence of microscopic structure as well as that of macroscopic density. The first sharp diffraction peak of the polymer melt, which is related to the intermediate-range order and is explained as resulting from the correlations between main chains, is suppressed at pressures less than 1 kbar. These changes in intermediate-range order show similarities to those seen in liquid-liquid or amorphous-amorphous transitions in simpler small molecule based systems, suggesting that this kind of phenomenon may occur in a wide range of materials.
ISSN:1539-3755
1550-2376
DOI:10.1103/physreve.85.021807