Effect of Crosslinker Variations on the Mechanical, Thermal, and Solvent Resistance Performance of Bio-Based Polyurethane Adhesives
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
This research aims to develop sustainable polyurethane adhesives with enhanced mechanical, thermal, and chemical properties by synthesizing two new crosslinkers: DEA, derived from Ethanolamine and Dimethyl benzene-1,4-dicarboxylate, and DPA, synthesized from 3-Amino-1-propanol and Dimethyl benzene-1,4- dicarboxylate. These crosslinkers were reacted with soybean oil polyol (SOP) and methylene diphenyl diisocyanate (MDI) to create adhesive samples with varying concentrations of crosslinkers (5, 10, 15, and 20 wt.% for DEA and 5, 10, 15, 20, and 25 wt.% for DPA), which were then cured at room temperature (RT) and 90C to examine the effects of thermal curing. FTIR analysis confirmed the successful formation of urethane linkages between the crosslinkers, polyol, and isocyanate. Tensile strength testing revealed that the adhesion strength of the adhesives increased with the crosslinker content up to an optimum level, with peak values of 6.77 MPa for DEA-15 wt.% and 6.86 MPa for DPA-20 wt.%, after which the adhesion strength decreased with higher concentrations. Gel swell analysis showed that DEA-based adhesives exhibited minimal swelling in both water and toluene, indicating a stable and well-formed crosslinked network. DPA-based adhesives, while exhibiting slightly lower gel content in toluene, still demonstrated strong solvent resistance, particularly in water, where the swelling degree was notably reduced. Hardness testing and Differential Scanning Calorimetry (DSC) further indicated that crosslinking significantly increased the rigidity and thermal stability of the adhesives, especially in heat-cured samples. These findings suggest that polyurethane adhesives with optimized crosslinker content, tailored for specific applications, offer strong potential for industrial use, particularly in applications requiring good mechanical strength, solvent resistance, and thermal stability.
Effect of Crosslinker Variations on the Mechanical, Thermal, and Solvent Resistance Performance of Bio-Based Polyurethane Adhesives
Student Center Ballroom
This research aims to develop sustainable polyurethane adhesives with enhanced mechanical, thermal, and chemical properties by synthesizing two new crosslinkers: DEA, derived from Ethanolamine and Dimethyl benzene-1,4-dicarboxylate, and DPA, synthesized from 3-Amino-1-propanol and Dimethyl benzene-1,4- dicarboxylate. These crosslinkers were reacted with soybean oil polyol (SOP) and methylene diphenyl diisocyanate (MDI) to create adhesive samples with varying concentrations of crosslinkers (5, 10, 15, and 20 wt.% for DEA and 5, 10, 15, 20, and 25 wt.% for DPA), which were then cured at room temperature (RT) and 90C to examine the effects of thermal curing. FTIR analysis confirmed the successful formation of urethane linkages between the crosslinkers, polyol, and isocyanate. Tensile strength testing revealed that the adhesion strength of the adhesives increased with the crosslinker content up to an optimum level, with peak values of 6.77 MPa for DEA-15 wt.% and 6.86 MPa for DPA-20 wt.%, after which the adhesion strength decreased with higher concentrations. Gel swell analysis showed that DEA-based adhesives exhibited minimal swelling in both water and toluene, indicating a stable and well-formed crosslinked network. DPA-based adhesives, while exhibiting slightly lower gel content in toluene, still demonstrated strong solvent resistance, particularly in water, where the swelling degree was notably reduced. Hardness testing and Differential Scanning Calorimetry (DSC) further indicated that crosslinking significantly increased the rigidity and thermal stability of the adhesives, especially in heat-cured samples. These findings suggest that polyurethane adhesives with optimized crosslinker content, tailored for specific applications, offer strong potential for industrial use, particularly in applications requiring good mechanical strength, solvent resistance, and thermal stability.
