Herein, the curing kinetics and the glass transition temperature (Tg) of MXene/phenolic epoxy composites with two curing agents, i.e., 4,4-diaminodiphenyl sulfone (DDS) and dicyandiamine (DICY), are systematically investigated using experimental characterization, mathematical modeling and molecular dynamics simulations. The effect of MXene content on an epoxy resin/amine curing agent system is also studied. These results reveal that the MXene/epoxy composites with both curing agent systems conform to the SB(m,n) two-parameter autocatalytic model. The addition of MXene accelerated the curing of the epoxy composite and increased the Tg by about 20 K. In addition, molecular dynamics were used to simulate the Tg of the cross-linked MXene/epoxy composites and to analyze microstructural features such as the free volume fraction (FFV). The simulation results show that the introduction of MXene improves the Tg and FFV of the simulated system. This is because the introduction of MXene restricts the movement of the epoxy/curing agent system. The conclusions are in good agreement with the experimental results.
Rights and obligations regulate the legal norms to adjust people's behavior, rights and obligations are a very important part of the law, and people do not have a deep understanding of rights and obligations, and this article argues that the study of rights and obligations should first adhere to the principle. Rights and obligations are interrelated, inseparable, interdependent, and develop together. The existence and development of one side, the other side will follow the existence and development, the unity of opposites. There is a scope of rights, beyond this scope may constitute the abuse of rights, it is illegal. And it is forbidden by law to place too much responsibility on one person.Rights are related to interests. Generally, people who enjoy rights can get benefits, while obligations are related to efforts and burdens. The law stipulates the rights and obligations of subjects, allowing them to decide whether to do certain behaviors or not to do certain behaviors. The right makes the actor carry on the activity because of the interest, while the obligation is some mandatory and binding force people to do a certain behavior. Therefore, it is of great significance to correctly understand rights and obligations.
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