Enhanced Mechanical and Thermal Properties of Castor Oil Polyol-Based Polyurethane Adhesives with Additional Crosslinker
Category
Sciences and Technology
Department
Material Science
Student Status
Graduate
Research Advisor
Dr. Ram Gupta
Document Type
Event
Location
Student Center Ballroom
Start Date
10-4-2025 2:00 PM
End Date
10-4-2025 4:00 PM
Description
Polyurethanes (PU) have been promising polymeric materials with many applications, including adhesives. The global PU market is projected to grow from 42.8 billion dollars in 2021 to 61.5 billion dollars by 2026. However, many PU adhesives are sourced from petroleum products. Therefore, to lower the dependence on non-renewable resources and provide sustainable and affordable alternatives. In this work, bio-based polyurethane adhesives were synthesized from modified castor oil-based polyol and tannic acid. Generally, polyurethane reaction depends on the properties of polyol and isocyanates. The most important aspect of these reactions is the OH number of the polyol, which is responsible for the crosslinking and bonding strength of the adhesives. Therefore, to increase the OH value and provide a better reaction platform, an external bio-based crosslinker in the form of tannic acid was incorporated. Its impact on the chemical and mechanical properties of the adhesives was characterized. The same was reflected in the mechanical strength test, in which the tensile of the adhesive increased from 3.71 to 6.05 MPa for the sample without any mass loadings of tannic acid to 10 wt.% tannic acid correspondingly. consider "Differential scanning calorimetry (DSC) analysis indicated a steady increase in the glass transition temperature (Tg) from 0 C to 62 oC as tannic acid content increased from 0 to 20 wt.%. This research will provide sustainable alternatives to petroleum-based adhesives with better thermal and mechanical properties.
Enhanced Mechanical and Thermal Properties of Castor Oil Polyol-Based Polyurethane Adhesives with Additional Crosslinker
Student Center Ballroom
Polyurethanes (PU) have been promising polymeric materials with many applications, including adhesives. The global PU market is projected to grow from 42.8 billion dollars in 2021 to 61.5 billion dollars by 2026. However, many PU adhesives are sourced from petroleum products. Therefore, to lower the dependence on non-renewable resources and provide sustainable and affordable alternatives. In this work, bio-based polyurethane adhesives were synthesized from modified castor oil-based polyol and tannic acid. Generally, polyurethane reaction depends on the properties of polyol and isocyanates. The most important aspect of these reactions is the OH number of the polyol, which is responsible for the crosslinking and bonding strength of the adhesives. Therefore, to increase the OH value and provide a better reaction platform, an external bio-based crosslinker in the form of tannic acid was incorporated. Its impact on the chemical and mechanical properties of the adhesives was characterized. The same was reflected in the mechanical strength test, in which the tensile of the adhesive increased from 3.71 to 6.05 MPa for the sample without any mass loadings of tannic acid to 10 wt.% tannic acid correspondingly. consider "Differential scanning calorimetry (DSC) analysis indicated a steady increase in the glass transition temperature (Tg) from 0 C to 62 oC as tannic acid content increased from 0 to 20 wt.%. This research will provide sustainable alternatives to petroleum-based adhesives with better thermal and mechanical properties.
