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<p>The evolution of molecular masses and their dispersity, functional properties of oligo and polymeric carbosilanes in an extended pyrolysis-polycondensation are investigated. The results reveal that the formation of two carbosilane fractions viz., oligo, polymeric carbosilanes, distinctively different in molecular structure with varying average molecular weights and dispersity (<i>725–2160 g/mol and 1580–4470 g/mol,</i> 2.83–3.0). Infrared and nuclear resonance data confirmed the structural formation as a function of process temperature, pressure and reaction time. Thermal data indicated that ceramic yield of oligo and polymeric carbosilane to be higher than 45% wt. and 60% wt. Solution viscometric measurements report that dynamic viscosity as <i>1.28–8.26</i>&#xa0;mPa.s and <i>4710 mPa.s</i> at 25&#xa0;°C for PCS solution in dilute and high concentration regimes, respectively. Thermal and rheological studies established the desirable functional properties such as ceramic yield and rheological characteristics suitable for fiber spinning and resin matrix applications.</p>

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Studies on Molecular Weight Distribution and Functional Properties of Oligo, Polymeric Carbosilanes in Pyrolysis Polycondensation of Polydimethylsilane

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • G. Santhana Krishnan,
  • A. Keerthana,
  • M. Shinan

摘要

The evolution of molecular masses and their dispersity, functional properties of oligo and polymeric carbosilanes in an extended pyrolysis-polycondensation are investigated. The results reveal that the formation of two carbosilane fractions viz., oligo, polymeric carbosilanes, distinctively different in molecular structure with varying average molecular weights and dispersity (725–2160 g/mol and 1580–4470 g/mol, 2.83–3.0). Infrared and nuclear resonance data confirmed the structural formation as a function of process temperature, pressure and reaction time. Thermal data indicated that ceramic yield of oligo and polymeric carbosilane to be higher than 45% wt. and 60% wt. Solution viscometric measurements report that dynamic viscosity as 1.28–8.26 mPa.s and 4710 mPa.s at 25 °C for PCS solution in dilute and high concentration regimes, respectively. Thermal and rheological studies established the desirable functional properties such as ceramic yield and rheological characteristics suitable for fiber spinning and resin matrix applications.