Study of Different Isocyanates on the Properties of Limonene and Geraniol Based Polyurethane Films
Category
Sciences and Technology
Department
Material Science
Student Status
Graduate
Research Advisor
Dr. Ram K. Gupta
Document Type
Event
Location
Governors
Start Date
10-4-2025 10:40 AM
End Date
10-4-2025 10:40 AM
Description
Plant-and animal-derived materials are gaining attention as potential substitutes for petroleum-based polymers. Growing environmental consciousness and the demand for greener and more sustainable materials are some of the primary causes of this change. A way to support the green and safe use of polyurethane is the thiol-ene click reaction, which is used to create biobased polyols. Limonene and geraniol are both plant-derived chemicals that contain unsaturated C=C (carbon-carbon double) bonds. Mercaptoethanol was used as a thiol compound in the thiol-ene click reaction to prepare bio-based polyols. Polyurethane films were synthesized by reacting polyols with isophorone diisocyanate (IPDI) and cyclohexyl isocyanate (CHDI), followed by film casting. The resulting PU films were cured at 70C to ensure complete crosslinking. To understand the structural and morphological characteristics, Fourier Transform Infrared Spectroscopy (FTIR) will be used. Tensile and hardness tests are also conducted to determine the mechanical properties of the synthesized PU films. Thermogravimetric analysis (TGA) and differential calorimetry (DSC) were employed to investigate the thermal properties of the PU films. The gel fraction analysis further supported the crosslinking efficiency in the PU networks. In this work, when comparing IPDI and CHDI in terms of mechanical properties in PU films, IPDI provides better mechanical properties than CHDI. The Tg's of LM+IPDI, LM+CHDI, GM+IPDI and GM+CHDI were 34.58, 56.49, 75 and 56.49 ℃, respectively. The GM+IPDI demonstrated better mechanical properties (Tensile Strength of 36.02 MPa) than the others due to the higher cross-linking density and complete network.
Study of Different Isocyanates on the Properties of Limonene and Geraniol Based Polyurethane Films
Governors
Plant-and animal-derived materials are gaining attention as potential substitutes for petroleum-based polymers. Growing environmental consciousness and the demand for greener and more sustainable materials are some of the primary causes of this change. A way to support the green and safe use of polyurethane is the thiol-ene click reaction, which is used to create biobased polyols. Limonene and geraniol are both plant-derived chemicals that contain unsaturated C=C (carbon-carbon double) bonds. Mercaptoethanol was used as a thiol compound in the thiol-ene click reaction to prepare bio-based polyols. Polyurethane films were synthesized by reacting polyols with isophorone diisocyanate (IPDI) and cyclohexyl isocyanate (CHDI), followed by film casting. The resulting PU films were cured at 70C to ensure complete crosslinking. To understand the structural and morphological characteristics, Fourier Transform Infrared Spectroscopy (FTIR) will be used. Tensile and hardness tests are also conducted to determine the mechanical properties of the synthesized PU films. Thermogravimetric analysis (TGA) and differential calorimetry (DSC) were employed to investigate the thermal properties of the PU films. The gel fraction analysis further supported the crosslinking efficiency in the PU networks. In this work, when comparing IPDI and CHDI in terms of mechanical properties in PU films, IPDI provides better mechanical properties than CHDI. The Tg's of LM+IPDI, LM+CHDI, GM+IPDI and GM+CHDI were 34.58, 56.49, 75 and 56.49 ℃, respectively. The GM+IPDI demonstrated better mechanical properties (Tensile Strength of 36.02 MPa) than the others due to the higher cross-linking density and complete network.
