Development of Bio-Based Polyurethane Adhesives: Impact of Schiff Base Crosslinkers on Mechanical and Thermal Properties
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
Historically, polyurethanes (PUs) are usually produced with petroleum-derived polyols like urea or phenol formaldehyde, both of which are hazardous to human health and detrimental to the ecosystem. Consequently, industries have lately shown interest in creating bio-based PUs composed of polyol derived from vegetable oil and diisocyanate. In this research, PU-based adhesives are created utilizing soybean oil polyol (SOP) and methylene diphenyl diisocyanate. To enhance the performance of synthesized PU adhesive, Schiff-based diols referred to as VB and VH have been incorporated into the system as crosslinkers, originating from butane diamine, hexane diamine, and vanillin. The successful production of PU has been validated with Fourier transform infrared spectroscopy (FT-IR) spectra. The tensile strength of adhesive samples was evaluated on oak wood specimens. In adhesive samples based on VB, VB-10wt.% exhibited the greatest tensile strength at 4400 KPa compared to all other weight percentages (wt.%), while for VH-based adhesive samples, the maximum tensile strength was recorded for VH-10wt.% at 5000 KPa. In both instances, as the wt.% of Schiff base diol rises, the tensile strength declines to 3800 KPa and 2900 KPa for VB-15wt.% and VH-15wt.% respectively. Additionally, the synthesized PU adhesive samples exhibit thermal stability, as verified by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) assessments. Furthermore, the gel content and degree of swelling tests additionally demonstrate the crosslinking efficiency of the PU adhesive materials.
Development of Bio-Based Polyurethane Adhesives: Impact of Schiff Base Crosslinkers on Mechanical and Thermal Properties
Student Center Ballroom
Historically, polyurethanes (PUs) are usually produced with petroleum-derived polyols like urea or phenol formaldehyde, both of which are hazardous to human health and detrimental to the ecosystem. Consequently, industries have lately shown interest in creating bio-based PUs composed of polyol derived from vegetable oil and diisocyanate. In this research, PU-based adhesives are created utilizing soybean oil polyol (SOP) and methylene diphenyl diisocyanate. To enhance the performance of synthesized PU adhesive, Schiff-based diols referred to as VB and VH have been incorporated into the system as crosslinkers, originating from butane diamine, hexane diamine, and vanillin. The successful production of PU has been validated with Fourier transform infrared spectroscopy (FT-IR) spectra. The tensile strength of adhesive samples was evaluated on oak wood specimens. In adhesive samples based on VB, VB-10wt.% exhibited the greatest tensile strength at 4400 KPa compared to all other weight percentages (wt.%), while for VH-based adhesive samples, the maximum tensile strength was recorded for VH-10wt.% at 5000 KPa. In both instances, as the wt.% of Schiff base diol rises, the tensile strength declines to 3800 KPa and 2900 KPa for VB-15wt.% and VH-15wt.% respectively. Additionally, the synthesized PU adhesive samples exhibit thermal stability, as verified by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) assessments. Furthermore, the gel content and degree of swelling tests additionally demonstrate the crosslinking efficiency of the PU adhesive materials.
