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<p>Polyborodimethylsiloxanes (PBDMS) are supramolecular elastomers known for their unique viscoelastic and shear-stiffening properties, attributed to weak Si–O: B dative bonding and hydrogen bonding. This enables a transition between liquid-like and elastic behavior, making PBDMS suitable for smart coatings, flexible electronics, and energy-dissipating materials. PBDMS is also a key component in strain-sensitive Interpenetrating Polymer Networks (IPNs), such as the commercially available D3O, which combines PBDMS with polyurethane matrix. Most PBDMS synthesis studies focus on high-temperature bulk methods (200&#xa0;°C), which, despite being contamination-free, suffer from poor mixing, chain scission, and scalability issues. This study explores a solvent-assisted approach using hydroxy-terminated PDMS of varying viscosities and boric acid (BA) at 120&#xa0;°C in toluene, ensuring uniform mixing and controlled molecular scission. Fourier transform infrared (FTIR) spectroscopy confirmed Si–O-B linkage formation within 2&#xa0;h, while gel permeation chromatography (GPC) showed a 90.4% molecular weight reduction. Rheological analysis indicated increased storage (G’) and loss (G’’) moduli, with elastic behavior dominating after 6&#xa0;h. This solvent-assisted method provides a scalable and reproducible alternative for PBDMS synthesis, offering precise control over viscoelastic properties for advanced applications.</p>

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Solvent-Assisted Synthesis of Polyborodimethylsiloxane (PBDMS) and its Rheological Research

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Ravinder Kaur,
  • Sanjeev Kumar Verma,
  • Rajeev Mehta

摘要

Polyborodimethylsiloxanes (PBDMS) are supramolecular elastomers known for their unique viscoelastic and shear-stiffening properties, attributed to weak Si–O: B dative bonding and hydrogen bonding. This enables a transition between liquid-like and elastic behavior, making PBDMS suitable for smart coatings, flexible electronics, and energy-dissipating materials. PBDMS is also a key component in strain-sensitive Interpenetrating Polymer Networks (IPNs), such as the commercially available D3O, which combines PBDMS with polyurethane matrix. Most PBDMS synthesis studies focus on high-temperature bulk methods (200 °C), which, despite being contamination-free, suffer from poor mixing, chain scission, and scalability issues. This study explores a solvent-assisted approach using hydroxy-terminated PDMS of varying viscosities and boric acid (BA) at 120 °C in toluene, ensuring uniform mixing and controlled molecular scission. Fourier transform infrared (FTIR) spectroscopy confirmed Si–O-B linkage formation within 2 h, while gel permeation chromatography (GPC) showed a 90.4% molecular weight reduction. Rheological analysis indicated increased storage (G’) and loss (G’’) moduli, with elastic behavior dominating after 6 h. This solvent-assisted method provides a scalable and reproducible alternative for PBDMS synthesis, offering precise control over viscoelastic properties for advanced applications.