Lerma-Canto Alejandro, Samper Maria D, Dominguez-Candela Ivan, Garcia-Garcia Daniel, Fombuena Vicent
Technological Institute of Materials (ITM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain.
Instituto de Seguridad Industrial, Radiofísica y Medioambiental (ISIRYM), Universitat Politècnica de València (UPV), Plaza Ferrándiz y Carbonell 1, 03801 Alcoy, Spain.
Polymers (Basel). 2023 Mar 11;15(6):1404. doi: 10.3390/polym15061404.
The present work aims to develop thermosetting resins using epoxidized hemp oil (EHO) as a bio-based epoxy matrix and a mixture of methyl nadic anhydride (MNA) and maleinized hemp oil (MHO) in different ratios as hardeners. The results show that the mixture with only MNA as a hardener is characterized by high stiffness and brittleness. In addition, this material is characterized by a high curing time of around 170 min. On the other hand, as the MHO content in the resin increases, the mechanical strength properties decrease and the ductile properties increase. Therefore, it can be stated that the presence of MHO confers flexible properties to the mixtures. In this case, it was determined that the thermosetting resin with balanced properties and high bio-based content contains 25% MHO and 75% MNA. Specifically, this mixture obtained a 180% higher impact energy absorption and a 195% lower Young's modulus than the sample with 100% MNA. Also, it has been observed that this mixture has significantly shorter times than the mixture containing 100% MNA (around 78 min), which is of great concern at an industrial level. Therefore, thermosetting resins with different mechanical and thermal properties can be obtained by varying the MHO and MNA content.
本工作旨在开发热固性树脂，使用环氧化大麻油（EHO）作为生物基环氧基体，并使用不同比例的甲基纳迪克酸酐（MNA）和马来酸化大麻油（MHO）的混合物作为固化剂。结果表明，仅以MNA作为固化剂的混合物具有高刚度和脆性的特点。此外，这种材料的固化时间较长，约为170分钟。另一方面，随着树脂中MHO含量的增加，机械强度性能下降，韧性性能增加。因此，可以说MHO的存在赋予了混合物柔性性能。在这种情况下，确定具有平衡性能和高生物基含量的热固性树脂含有25%的MHO和75%的MNA。具体而言，与100% MNA的样品相比，这种混合物的冲击能量吸收提高了180%，杨氏模量降低了195%。此外，还观察到这种混合物的固化时间比含有100% MNA的混合物（约78分钟）明显短，这在工业层面上是非常重要的。因此，通过改变MHO和MNA的含量，可以获得具有不同机械和热性能的热固性树脂。
