Polymer Science Series A

, Volume 54, Issue 8, pp 671–677 | Cite as

Macrochain configuration, stucture of free volume and transport properties of poly(1-trimethylsilyl-1-propyne) and poly(1-trimethylgermyl-1-propyne)

  • S. M. Matson
  • K. Rätzke
  • M. Q. Shaikh
  • E. G. Litvinova
  • S. M. Shishatskiy
  • K. -V. Peinemann
  • V. S. Khotimskiy
Transport in Polymers

Abstract

The relationship between poly(1-trimethylsilyl-1-propyne) (PTMSP) and poly(1-trimethylgermyl-1-propyne) (PTMGP) microstructure, gas permeability and structure of free volume is reported. n-Butane/methane mixed-gas permeation properties of PTMSP and PTMGP membranes with different cis-/trans-composition have been investigated. The n-butane/methane selectivities for mixed gas are by an order higher than the selectivities calculated from pure gas measurements (the mixed-gas n-butane/methane selectivities are 20–40 for PTMSP and 22–35 for PTMGP). Gas permeability and n-butane/methane selectivity essentially differ in polymers with different cis-/trans-composition. Positron annihilation lifetime spectroscopy investigation of PTMSP and PTMGP with different microstructure has determined distinctions in total amount and structure of free volume, i.e. distribution of free volume elements. The correlation between total amount of free volume and gas transport parameters is established: PTMSP and PTMGP with bigger free volume exhibit higher n-butane permeability and mixed-gas n-butane/methane selectivity. Such behavior is discussed in relation to the submolecular structure of polymers with different microstructure and sorption of n-butane in polymers with different free volume.

Keywords

Free Volume Polymer Science Series Positron Annihilation Lifetime Spectroscopy Mixed Microstructure Trans Unit 

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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • S. M. Matson
    • 1
  • K. Rätzke
    • 2
  • M. Q. Shaikh
    • 2
  • E. G. Litvinova
    • 1
  • S. M. Shishatskiy
    • 3
  • K. -V. Peinemann
    • 4
  • V. S. Khotimskiy
    • 1
  1. 1.A.V. Topchiev Institute of Petrochemical SynthesisRussian Academy of SciencesMoscowRussia
  2. 2.Technical FacultyUniversity of KielKielGermany
  3. 3.Institute of Polymer ResearchHelmholtz-Zentrum GeesthachtGeesthachtGermany
  4. 4.Advanced Membranes and Porous Materials Center at KAUSTKing Abdullah University of Science and Technology (KAUST)ThuwalKingdom of Saudi Arabia

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