The blends of ethylene vinyl acetate (EVA) and thermoplastic polyurethane (TPU) were prepared by means of blending. The mechanical properties of EVA/TPU blends and thermal stability of the extrudates were investigated. The results show that the toughness of EVA/TPU has been improved after adding TPU into EVA, and doesn’t affect the thermal stability of material.
This paper presents an analysis about the variation of quality factor (Q-factor) aiming at the complex micro resonator to explore the mechanism of the energy loss under different pressures. To demonstrate the work, a series of resonators are designed, which mainly differs in the squeeze-damping and scale of the beam. According to corresponding structure, the Q-factor is measured at different pressures while the theoretical air damping model combined with Christians model is also proposed. The air damping models of three types are proved to have 10%~30% relative error compared to experimental results in low vacuum, respectively. And, for the high vacuum, the structural energy loss plays an important role on the Q-factor, which increases with the decrement of comb quantity and the beam width.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.