Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms

A. Turetski, Alexei Turetski, G.J.J. Out, Gerardus J.J. Out, H.A. Klok, M. Moller, Martin Möller

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Abstract

Temperature dependent X-ray diffraction studies of poly(di-n-alkylsiloxane)s substituted with side chains containing 7 to 10 carbon atoms have been carried out in order to elucidate the crystalline structure of these materials. In contrast to their lower substituted homologues, no evidence for the presence of a hexagonal columnar mesophase could be found for the investigated materials. At low temperatures, far below the melting temperature, the polysiloxane backbones are assumed to pack in an orthorhombic lattice, with the n-alkyl side chains in a planar all-trans conformation and oriented perpendicularly to the backbone. The paraffinic n-alkyl side chains were found to crystallize in an orthorhombic lattice. The thermal behaviour of the investigated materials has been observed to show an odd-even effect. Whereas poly(di-n-heptylsiloxane) and poly(di-n-nonylsiloxane) were found to melt in a single step, an intermediate state of order was observed for poly(di-n-octylsiloxane) and poly(di-n-decylsiloxane) upon heating from the crystalline to the isotropic state. For this intermediate state, a pseudohexagonal packing of the n-alkyl side chains is proposed.
Original languageUndefined
Pages (from-to)1303-1308
JournalPolymer
Volume36
Issue number36
DOIs
Publication statusPublished - 1995

Keywords

  • IR-11366
  • METIS-106127

Cite this

Turetski, A., Turetski, A., Out, G. J. J., Out, G. J. J., Klok, H. A., Moller, M., & Möller, M. (1995). Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms. Polymer, 36(36), 1303-1308. https://doi.org/10.1016/0032-3861(95)93934-E
Turetski, A. ; Turetski, Alexei ; Out, G.J.J. ; Out, Gerardus J.J. ; Klok, H.A. ; Moller, M. ; Möller, Martin. / Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms. In: Polymer. 1995 ; Vol. 36, No. 36. pp. 1303-1308.
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abstract = "Temperature dependent X-ray diffraction studies of poly(di-n-alkylsiloxane)s substituted with side chains containing 7 to 10 carbon atoms have been carried out in order to elucidate the crystalline structure of these materials. In contrast to their lower substituted homologues, no evidence for the presence of a hexagonal columnar mesophase could be found for the investigated materials. At low temperatures, far below the melting temperature, the polysiloxane backbones are assumed to pack in an orthorhombic lattice, with the n-alkyl side chains in a planar all-trans conformation and oriented perpendicularly to the backbone. The paraffinic n-alkyl side chains were found to crystallize in an orthorhombic lattice. The thermal behaviour of the investigated materials has been observed to show an odd-even effect. Whereas poly(di-n-heptylsiloxane) and poly(di-n-nonylsiloxane) were found to melt in a single step, an intermediate state of order was observed for poly(di-n-octylsiloxane) and poly(di-n-decylsiloxane) upon heating from the crystalline to the isotropic state. For this intermediate state, a pseudohexagonal packing of the n-alkyl side chains is proposed.",
keywords = "IR-11366, METIS-106127",
author = "A. Turetski and Alexei Turetski and G.J.J. Out and Out, {Gerardus J.J.} and H.A. Klok and M. Moller and Martin M{\"o}ller",
year = "1995",
doi = "10.1016/0032-3861(95)93934-E",
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volume = "36",
pages = "1303--1308",
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Turetski, A, Turetski, A, Out, GJJ, Out, GJJ, Klok, HA, Moller, M & Möller, M 1995, 'Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms' Polymer, vol. 36, no. 36, pp. 1303-1308. https://doi.org/10.1016/0032-3861(95)93934-E

Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms. / Turetski, A.; Turetski, Alexei; Out, G.J.J.; Out, Gerardus J.J.; Klok, H.A.; Moller, M.; Möller, Martin.

In: Polymer, Vol. 36, No. 36, 1995, p. 1303-1308.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Structural transformations in poly(di-n-alkylsiloxane)s with alkyl side groups containing 7 to 10 carbon atoms

AU - Turetski, A.

AU - Turetski, Alexei

AU - Out, G.J.J.

AU - Out, Gerardus J.J.

AU - Klok, H.A.

AU - Moller, M.

AU - Möller, Martin

PY - 1995

Y1 - 1995

N2 - Temperature dependent X-ray diffraction studies of poly(di-n-alkylsiloxane)s substituted with side chains containing 7 to 10 carbon atoms have been carried out in order to elucidate the crystalline structure of these materials. In contrast to their lower substituted homologues, no evidence for the presence of a hexagonal columnar mesophase could be found for the investigated materials. At low temperatures, far below the melting temperature, the polysiloxane backbones are assumed to pack in an orthorhombic lattice, with the n-alkyl side chains in a planar all-trans conformation and oriented perpendicularly to the backbone. The paraffinic n-alkyl side chains were found to crystallize in an orthorhombic lattice. The thermal behaviour of the investigated materials has been observed to show an odd-even effect. Whereas poly(di-n-heptylsiloxane) and poly(di-n-nonylsiloxane) were found to melt in a single step, an intermediate state of order was observed for poly(di-n-octylsiloxane) and poly(di-n-decylsiloxane) upon heating from the crystalline to the isotropic state. For this intermediate state, a pseudohexagonal packing of the n-alkyl side chains is proposed.

AB - Temperature dependent X-ray diffraction studies of poly(di-n-alkylsiloxane)s substituted with side chains containing 7 to 10 carbon atoms have been carried out in order to elucidate the crystalline structure of these materials. In contrast to their lower substituted homologues, no evidence for the presence of a hexagonal columnar mesophase could be found for the investigated materials. At low temperatures, far below the melting temperature, the polysiloxane backbones are assumed to pack in an orthorhombic lattice, with the n-alkyl side chains in a planar all-trans conformation and oriented perpendicularly to the backbone. The paraffinic n-alkyl side chains were found to crystallize in an orthorhombic lattice. The thermal behaviour of the investigated materials has been observed to show an odd-even effect. Whereas poly(di-n-heptylsiloxane) and poly(di-n-nonylsiloxane) were found to melt in a single step, an intermediate state of order was observed for poly(di-n-octylsiloxane) and poly(di-n-decylsiloxane) upon heating from the crystalline to the isotropic state. For this intermediate state, a pseudohexagonal packing of the n-alkyl side chains is proposed.

KW - IR-11366

KW - METIS-106127

U2 - 10.1016/0032-3861(95)93934-E

DO - 10.1016/0032-3861(95)93934-E

M3 - Article

VL - 36

SP - 1303

EP - 1308

JO - Polymer

JF - Polymer

SN - 0032-3861

IS - 36

ER -