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<p>A solvent-free DBU-catalyzed condensation of hydroxy-terminated polydimethylsiloxane (PDMS-OH) with boric acid (BA) was investigated as a route to polyborodimethylsiloxane (PBDMS), a dynamic supramolecular silicone elastomer. Fourier Transform Infrared spectroscopy (FTIR) showed the progressive growth of the characteristic Si-O-B absorption band at 1340&#xa0;cm⁻¹, which reached a plateau within 90&#xa0;min. Comparative FTIR analysis further indicated retention of Si-O-B linkages after purification together with the removal of residual boric acid and boroxine-type byproducts. Size-exclusion chromatography (SEC) revealed a time-dependent increase in apparent molecular-weight parameters, consistent with the formation of higher-apparent-molecular-weight boron (B)-containing species during condensation. Rheological measurements demonstrated enhanced viscoelastic behavior relative to the PDMS precursor and uncatalyzed PBDMS, characterized by higher storage moduli, longer relaxation times, and a more pronounced solid-like response associated with dynamic supramolecular interactions. Collectively, the spectroscopic, chromatographic, and rheological results indicate that DBU promotes PBDMS network formation and provides an organocatalytic route to dynamic silicone elastomers with tunable mechanical properties.</p>

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Organocatalytic synthesis of polyborodimethylsiloxane (PBDMS) via DBU: a green strategy for dynamic supramolecular elastomers

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Simran Guleria,
  • Rajeev Mehta

摘要

A solvent-free DBU-catalyzed condensation of hydroxy-terminated polydimethylsiloxane (PDMS-OH) with boric acid (BA) was investigated as a route to polyborodimethylsiloxane (PBDMS), a dynamic supramolecular silicone elastomer. Fourier Transform Infrared spectroscopy (FTIR) showed the progressive growth of the characteristic Si-O-B absorption band at 1340 cm⁻¹, which reached a plateau within 90 min. Comparative FTIR analysis further indicated retention of Si-O-B linkages after purification together with the removal of residual boric acid and boroxine-type byproducts. Size-exclusion chromatography (SEC) revealed a time-dependent increase in apparent molecular-weight parameters, consistent with the formation of higher-apparent-molecular-weight boron (B)-containing species during condensation. Rheological measurements demonstrated enhanced viscoelastic behavior relative to the PDMS precursor and uncatalyzed PBDMS, characterized by higher storage moduli, longer relaxation times, and a more pronounced solid-like response associated with dynamic supramolecular interactions. Collectively, the spectroscopic, chromatographic, and rheological results indicate that DBU promotes PBDMS network formation and provides an organocatalytic route to dynamic silicone elastomers with tunable mechanical properties.