Poly(di-n-propylsilylene) and Poly(diethylsilylene-co-di-n-propylsilylene): Solid State Structure and Phase Transitions

Rogério Menescal, Jeffrey Eveland, Robert West, Larissa L. Leites, Sergey S. Bukalov, Tatiana D. Yadritseva, Marianne Blazsó

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17 Citations (Scopus)

Abstract

Poly(di-n-propylsilylene) and poly(diethylsilylene-co-di-n-propylsilylene) have been investigated by Raman, IR, and UV spectroscopy, TGA, DSC, wide angle X-ray diffraction, and solid state 13C and 29Si NMR. No IR-Raman coincidences were found in the Si-Si or Si-C stretching regions for (n-Pr2Si)n, demonstrating that the main chain has a planar all-trans configuration, T consistent with the UV absorption at 355 nm. From the Si-C stretching bands, all of the n-propyl groups appear to have the same conformation. (n-Pr2Si)n(Et2Si)m also has the T configuration at room temperature, and a tetragonal crystal lattice. Both polymers undergo a first-order transition to a mesomorphic phase, above 222 °C for (n-Pr2Si)nand above 113 °C for the copolymer.

Original languageEnglish
Pages (from-to)5885-5892
Number of pages8
JournalMacromolecules
Volume27
Issue number20
DOIs
Publication statusPublished - Sep 1 1994

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ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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