Effect of Diamine and Triamines Crosslinkers on the Adhesive Properties of Soybean Oil-Based Non-Isocyanate Polyurethane
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
Nowadays, polyurethanes (PUs) play a major role in the polymer industry and are more and more popular due to their advantages and unique mechanical and chemical properties in different applications like foams, paint, coatings, elastomers, and adhesives, Bio-based sources have recently gained attention as sustainable alternatives to conventional petroleum-based material. Due to growing environmental concerns and the excessive use of petroleum-based products, this study explores non-isocyanate polyurethanes (NIPUs) as sustainable, low-toxicity alternatives to traditional PUs. To achieve this, as a starting material, soybean oil (SBO) was used, and it was converted into epoxidized soybean oil (ESBO). ESBO was then converted into CSBO using a Parr autoclave reactor in the presence of tetrabutylammonium bromide (TBAB). Then synthesized CSBO was characterized using physicochemical experiments, e.g. FT-IR, Oxirane oxygen percentage (%EOC content), viscosity analysis, gel permeation chromatography (GPC), and also the 1H NMR spectra further verified the formation of CSBO, Following the successful synthesis of CSBO, we used solvent-free and catalyst-free methods to synthesize NIPU. For that, we used two different diamines, namely Isophorone diamine (IPDI) and Meta-xylylene diamine (m-XDA), or one triamine, e.g. Tris(2-aminoethyl)amine (TAA). The NIPU adhesive specimens containing IPDA and m-XDA as curing agents exhibit lap shear strength of 1.1 MPa and 4.97 MPa respectively on the wood coupon. However, TAA containing adhesive sample shows excellent shear strength of 7.62 MPa on stainless-steel metal coupon under the optimized condition. The thermal transition of all fabricated adhesive samples was investigated by DSC analysis which shows higher glass transition temperature (Tg) of 35.12 oC and 34.58 oC for CSBO_IPDA (1:4) and CSBO_TAA (1:2.5) respectively compared to CSBO_m-XDA (1:3.5) specimen (Tg 16.33C) indicating higher cross-linking in the polymer network.
Effect of Diamine and Triamines Crosslinkers on the Adhesive Properties of Soybean Oil-Based Non-Isocyanate Polyurethane
Student Center Ballroom
Nowadays, polyurethanes (PUs) play a major role in the polymer industry and are more and more popular due to their advantages and unique mechanical and chemical properties in different applications like foams, paint, coatings, elastomers, and adhesives, Bio-based sources have recently gained attention as sustainable alternatives to conventional petroleum-based material. Due to growing environmental concerns and the excessive use of petroleum-based products, this study explores non-isocyanate polyurethanes (NIPUs) as sustainable, low-toxicity alternatives to traditional PUs. To achieve this, as a starting material, soybean oil (SBO) was used, and it was converted into epoxidized soybean oil (ESBO). ESBO was then converted into CSBO using a Parr autoclave reactor in the presence of tetrabutylammonium bromide (TBAB). Then synthesized CSBO was characterized using physicochemical experiments, e.g. FT-IR, Oxirane oxygen percentage (%EOC content), viscosity analysis, gel permeation chromatography (GPC), and also the 1H NMR spectra further verified the formation of CSBO, Following the successful synthesis of CSBO, we used solvent-free and catalyst-free methods to synthesize NIPU. For that, we used two different diamines, namely Isophorone diamine (IPDI) and Meta-xylylene diamine (m-XDA), or one triamine, e.g. Tris(2-aminoethyl)amine (TAA). The NIPU adhesive specimens containing IPDA and m-XDA as curing agents exhibit lap shear strength of 1.1 MPa and 4.97 MPa respectively on the wood coupon. However, TAA containing adhesive sample shows excellent shear strength of 7.62 MPa on stainless-steel metal coupon under the optimized condition. The thermal transition of all fabricated adhesive samples was investigated by DSC analysis which shows higher glass transition temperature (Tg) of 35.12 oC and 34.58 oC for CSBO_IPDA (1:4) and CSBO_TAA (1:2.5) respectively compared to CSBO_m-XDA (1:3.5) specimen (Tg 16.33C) indicating higher cross-linking in the polymer network.
