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Synergistic Role of Crosslinker and Silane-Based Additive in Designing Structurally Robust Bio-Based Polyurethane

Mayankkumar L Chaudhary1, Kinal Chaudhari1,2, Rutu Patel1

  • 1National Institute for Materials Advancement, Pittsburg State University, 1204 Research Road, Pittsburg, KS 66762, USA.

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|June 26, 2026
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Summary

This study enhances bio-based polyurethane (PU) coatings using glycerol and hexamethyldisilane (HMDS). The optimized formulation achieves improved mechanical strength, durability, and water resistance for sustainable industrial applications.

Keywords:
bio-basedcoatingdurabilityorganosilanepolyurethane

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Sustainable Materials

Background:

  • Petrochemical-based coatings pose environmental concerns.
  • Bio-based polyurethane (PU) coatings offer a sustainable alternative but often lack performance.
  • Improving mechanical properties, durability, and chemical resistance is crucial for bio-based PU adoption.

Purpose of the Study:

  • To develop a high-performance, sustainable bio-based coating.
  • To enhance structural robustness and hydrophobicity of PU coatings.
  • To investigate the synergistic effects of glycerol and hexamethyldisilane (HMDS) on PU properties.

Main Methods:

  • Synthesized PU coatings using soybean oil polyol (SOP), glycerol, and methylene diphenyl diisocyanate (MDI).
  • Incorporated varying wt.% of glycerol (5-20%) and HMDS (10-50%).
  • Evaluated mechanical properties (tensile strength), water contact angle (WCA), chemical resistance, and thermal stability (calorimetry, TGA).

Main Results:

  • Optimal glycerol content (10 wt.%) yielded a tensile strength of 47.18 MPa.
  • 10 wt.% HMDS addition significantly increased WCA to 95.76° and enhanced chemical resistance.
  • Higher HMDS loadings led to network disruption and reduced mechanical strength.
  • Modified coatings demonstrated retained high thermal stability.

Conclusions:

  • A synergistic crosslinker-additive strategy using glycerol and HMDS effectively enhances bio-based PU coatings.
  • The developed coatings exhibit improved structural robustness, hydrophobicity, and chemical resistance.
  • This approach presents a viable solution for high-performance, sustainable coatings in industrial applications.