Abstract
In this work a novel ambient curable coating was synthesized based on the Michael addition reaction of acetoacetylated castor oil and a multifunctional acrylate. In the research, we used hexamethylene diacrylate as crosslinker to optimize the reaction conditions and found that a ratio of acetoacetylated castor oil to acrylate groups of 1:1.5 and a catalyst (DBU) loading of 2 wt % provided an appropriate curing time. The acetoacetylated castor oil was characterized by 1H NMR and 13C NMR spectroscopy and the obtained coating characterized by FTIR to confirm the functionalization reaction. The tensile strength, cross linking density, and thermal properties of the resulting thermosets were investigated by dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Results demonstrated that the glass transition temperatures, tensile strength, and thermal degradation were significantly improved with higher cross-linking density. Moreover, we prepared films with different multifunctional acrylate cross-linkers and found that with the increase of cross-linking density, the swelling of the film rate decreased. Overall, thermosets made from Michael crosslinking technology provided a highly bio-based coating system.
Highlights
Nowadays, replacing petroleum-based raw materials with renewable resources is a major contemporary challenge in terms of both economic and environmental aspects while the application of environment friendly and highly efficient processes has resulted in considerable attention in scientific research work [1,2,3,4]
We present a room-temperature, environmentally friendly coating material based on the Michael addition reaction of acetoacetylated castor oil and multifunctional acrylate
The new peaks at 198 and 165 ppm of acetoacetylated castor oil can be seen in Figure 2b, and this signal indicates that 198 and 165 ppm of acetoacetylated castor oil can be seen in Figure 1b, and this signal indicates that the hydroxyl groups on the oiloil have
Summary
Nowadays, replacing petroleum-based raw materials with renewable resources is a major contemporary challenge in terms of both economic and environmental aspects while the application of environment friendly and highly efficient processes has resulted in considerable attention in scientific research work [1,2,3,4]. Castor oil has often been the starting material for scientific researchers to prepare polymer materials [6]. Since the Michael reaction was discovered by Arthur Michael in the late 1800s, systematic studies on this reaction for the preparation of novel polymers and composites has received significant attention [12]. The Michael addition reaction has become one of the most useful C–C bond forming reactions, and it has been employed in the synthesis
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