Role of columnar mesophase in the morphological evolution of polymer single crystals upon heating: A combined atomic force microscopy and electron diffraction study

Raluca I. Gearba; Nicolas Dubreuil; Denis V. Anokhin; Yuli K. Godovsky; Jr-Jeng Ruan; Annette Thierry; Bernard Lotz; Dimitri A. Ivanov

doi:10.1021/ma051606g

Role of columnar mesophase in the morphological evolution of polymer single crystals upon heating: A combined atomic force microscopy and electron diffraction study

Raluca I. Gearba, Nicolas Dubreuil, Denis V. Anokhin, Yuli K. Godovsky, Jr-Jeng Ruan, Annette Thierry, Bernard Lotz, Dimitri A. Ivanov

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The crystal-to-hexagonal columnar mesophase transition in solution-grown single crystals of poly-(di-n-propyl siloxane), PDPS, was studied in situ with selected-area electron diffraction and variable-temperature atomic force microscopy. It was observed that, upon the transition, the hexagonal columnar mesophase displays two mutually orthogonal orientations of the lattice. The 2a* and 2b* reciprocal lattice vectors of the α-phase crystal coincide with the a* vectors of each of the two differently oriented mesophase lattices. The in situ atomic force microscopy study of the evolution of a single PDPS crystal upon heating shows that crystal thickening can occur via a short-term dwelling in the mesophase. The high chain mobility in the mesophase can account for the exceptional range of accessible crystal thicknesses of PDPS, which is much larger than that observed for polyethylene single crystals.

Original language	English
Pages (from-to)	978-987
Number of pages	10
Journal	Macromolecules
Volume	39
Issue number	3
DOIs	https://doi.org/10.1021/ma051606g
Publication status	Published - 2006 Feb 7

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma051606g

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title = "Role of columnar mesophase in the morphological evolution of polymer single crystals upon heating: A combined atomic force microscopy and electron diffraction study",

abstract = "The crystal-to-hexagonal columnar mesophase transition in solution-grown single crystals of poly-(di-n-propyl siloxane), PDPS, was studied in situ with selected-area electron diffraction and variable-temperature atomic force microscopy. It was observed that, upon the transition, the hexagonal columnar mesophase displays two mutually orthogonal orientations of the lattice. The 2a* and 2b* reciprocal lattice vectors of the α-phase crystal coincide with the a* vectors of each of the two differently oriented mesophase lattices. The in situ atomic force microscopy study of the evolution of a single PDPS crystal upon heating shows that crystal thickening can occur via a short-term dwelling in the mesophase. The high chain mobility in the mesophase can account for the exceptional range of accessible crystal thicknesses of PDPS, which is much larger than that observed for polyethylene single crystals.",

author = "Gearba, {Raluca I.} and Nicolas Dubreuil and Anokhin, {Denis V.} and Godovsky, {Yuli K.} and Jr-Jeng Ruan and Annette Thierry and Bernard Lotz and Ivanov, {Dimitri A.}",

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T1 - Role of columnar mesophase in the morphological evolution of polymer single crystals upon heating

T2 - A combined atomic force microscopy and electron diffraction study

AU - Gearba, Raluca I.

AU - Dubreuil, Nicolas

AU - Anokhin, Denis V.

AU - Godovsky, Yuli K.

AU - Ruan, Jr-Jeng

AU - Thierry, Annette

AU - Lotz, Bernard

AU - Ivanov, Dimitri A.

PY - 2006/2/7

Y1 - 2006/2/7

N2 - The crystal-to-hexagonal columnar mesophase transition in solution-grown single crystals of poly-(di-n-propyl siloxane), PDPS, was studied in situ with selected-area electron diffraction and variable-temperature atomic force microscopy. It was observed that, upon the transition, the hexagonal columnar mesophase displays two mutually orthogonal orientations of the lattice. The 2a* and 2b* reciprocal lattice vectors of the α-phase crystal coincide with the a* vectors of each of the two differently oriented mesophase lattices. The in situ atomic force microscopy study of the evolution of a single PDPS crystal upon heating shows that crystal thickening can occur via a short-term dwelling in the mesophase. The high chain mobility in the mesophase can account for the exceptional range of accessible crystal thicknesses of PDPS, which is much larger than that observed for polyethylene single crystals.

AB - The crystal-to-hexagonal columnar mesophase transition in solution-grown single crystals of poly-(di-n-propyl siloxane), PDPS, was studied in situ with selected-area electron diffraction and variable-temperature atomic force microscopy. It was observed that, upon the transition, the hexagonal columnar mesophase displays two mutually orthogonal orientations of the lattice. The 2a* and 2b* reciprocal lattice vectors of the α-phase crystal coincide with the a* vectors of each of the two differently oriented mesophase lattices. The in situ atomic force microscopy study of the evolution of a single PDPS crystal upon heating shows that crystal thickening can occur via a short-term dwelling in the mesophase. The high chain mobility in the mesophase can account for the exceptional range of accessible crystal thicknesses of PDPS, which is much larger than that observed for polyethylene single crystals.

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Role of columnar mesophase in the morphological evolution of polymer single crystals upon heating: A combined atomic force microscopy and electron diffraction study

Abstract

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