The rapid expansion of the polyurethane (PU) market requires a facile synthesis route as the world is proceeding toward sustainability. PU has multiple applications for both flexible and rigid forms such as bedding and construction, respectively. Previously, this class of polymer had a high dependency on petrochemical resources which can be solved by replacing them with renewable sources. However, this conventional method contains isocyanate, which is harmful to the environment as well as human health. Therefore, researchers are continuously attempting experiments on non-isocyanate polyurethane (NIPU). Herein, epoxide soybean oil (ESBO) was treated with carbon dioxide and a catalyst in the presence of heat. The synthesized carbonated soybean oil (CSBO) was blended with a diamine to produce a NIPU adhesive network. This network showed thermal stability till 180 C temperature which was determined by thermogravimetric analysis (TGA). Furthermore, to study the tensile strength of the NIPU adhesive, a single lap joint sample was tested with a tensile testing machine. To strengthen the thermal and mechanical properties of the green polyurethane adhesive, silica dioxide (SiO<sub>2</sub>) was added as a filler. With the neat NIPU sample, 3 MPa of tensile strength was recorded. As expected, the addition of the filler to the NIPU adhesive resulted in high thermal stability (up to 220 C) and tensile strength of more than 2 MPa. This increment in the mechanical property was likely due to the rigid silica particles which prevented the crack from spreading and increased the toughness of the overall material. So, the observed phenomenon indicated that the improved mechanical strength agreed with the crack pinning mechanism.  The hydrophobicity was detected by the water contact angle (WCA) test. This work brought a facile path to produce NIPU adhesive from soybean oil which could be further used as a wood adhesive.

Non-isocyanate polyurethane synthesized through carbonation of soybean oil for application in adhesive industries

Where thousands of chemistry professionals meet to share ideas and advance scientific and technical knowledge. Spring 2023 abstracts, posters, and presentations will launch at the end of March.

ACS Spring 2023

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.