Journal of Inorganic and Organometallic Polymers

, Volume 3, Issue 3, pp 231–240 | Cite as

Synthesis, characterization, and platinum-catalyzed cross-linking of 1,4-bis(1-methyl-1-silacyclobutyl) benzene, co-oligo(1-silacyclobut-1-ylidene-1,4-phenylene), and co-oligo(1-silacyclobut-1-ylidene-4,4′-diphenylene)

  • Charles X. Liao
  • Min Wei Chen
  • Liqing Sun
  • William P. Weber


1,4-bis(1-Methyl-1-silacyclobutyl)benzene (I) has been prepared by the reaction of 1-chloro-1-methyl-1-silacyclobutane with the di-Grignard reagent prepared fromp-dibromobenzene. In a similar manner, co-oligo(1-silacyclobut-1-ylidene-1,4-phenylene) (II) and co-oligo(1-silacyclobut-1-ylidene-4,4′-biphenylene) (III) have been prepared by condensation oligomerization between 1,1-dichloro-1-silacyclobutane and the di-Grignard reagents prepared fromp-dibromobenzene and 4,4′-dibromobiphenyl, respectively. These have been characterized by1H,13C, and29Si NMR as well as FT-IR and UV spectroscopy. The molecular weight distributions of these co-oligomers have been determined by GPC. Their thermal stabilities have been evaluated by TGA. Thermal degradation of these co-oligomers in nitrogen gives high (60%) char yields. The stability of these chars in air has been determined. TheTg's of these co-oligomers have been measured by DSC. Platinum-catalyzed ring opening of the silacyclobutane rings ofI,II, andIII cross-links these to thermoset materials. The bending moduli (logE′), tan δ, andTg's of these materials have been determined by DMTA. The dielectric constant and dissipation factor of cross-linkedII are reported.

Key words

Pt catalyzed cross-linking silacyclobutane polycarbosilane thermoset 


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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Charles X. Liao
    • 1
  • Min Wei Chen
    • 1
  • Liqing Sun
    • 1
  • William P. Weber
    • 1
  1. 1.Donald P. and Katherine B. Loker Hydrocarbon Research Institute, Department of ChemistryUniversity of Southern CaliforniaLos Angeles

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