Date of Award
Spring 5-15-2024
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Chemistry
First Advisor
Dr. Ram K. Gupta
Second Advisor
Dr. Khamis Siam
Third Advisor
Dr. Timothy Dawsey
Fourth Advisor
Dr. Anuradha Ghosh
Keywords
effects of diamines, epoxidized soyabean oil, bio-based resin, diamines, adhesive, oil
Abstract
Synthesizing environmentally friendly materials from renewable feedstock is crucial for reducing pressure on non-renewable resources such as petroleum products. Plant oils (POs) play a vital role in the formation of polymers. However, modifications are essential for better performance. One possible approach to achieve sustainable development in the materials sector is to produce polymers from epoxidized plant oils (EPOs), which are renewable and environmentally beneficial. Polymers with a high concentration of functional groups can be used as crosslinking agents to enhance the properties of EPO-based polymers.
This work produced a resin with unique properties and potential uses by crosslinking epoxidized soyabean oil (ESO) with highly branched and flexible polyamine by ring-opening and amidation polymerizations. In this study, ESO was reacted with aliphatic amines such as ethylene diamine (ED), butane diamine (BD), and pentane diamine (PD) in the presence of ammonium chloride as a catalyst at 195°C to form the corresponding polymer via deamination reaction. Some advantages include solvent-free steps, which do not require purification and premodifications. This approach is straightforward and ecologically benign. After curing, melamine pentane diamine-ESO (MPD-ESO) maintained its position as the strongest structural adhesive among the synthesized resins, with a lap shear strength of 1996 kPa for galvanized steel. Regardless of the curing temperature, galvanized steel’s lap shear strength consistently outperforms. Melamine ethylene diamine-ESO (MED-ESO) resin in strength comparisons, at 100°C, galvanized steel has a lap shear strength of about 300 kPa, higher than copper-coated aluminium and aluminium; at 180°C, this value increases to 750 kPa. While MPD-ESO resin has a shear strength of 1996 kPa at 180oC, melamine butane diamine-ESO (MBD-ESO) resin only has 1220 kPa. This increasing chain length study was performed to determine the change in the thermal and mechanical properties of the resin. Thermogravimetric analysis confirms the increase in 5%, 10%, and maximum weight loss temperatures with increasing chain length. Galvanized steel lap shear strength also increases on moving from ED to PD.
Recommended Citation
Panchal, Uday Mukeshbhai, "ROLE OF DIAMINES ON THE PROPERTIES OF SOYBEAN OIL-BASED ADHESIVES" (2024). Electronic Theses & Dissertations. 827.
https://digitalcommons.pittstate.edu/etd/827
