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Synthesis and Characteristics of Thermo-Photo Staged-Response Shape Memory Poly(aryl ether ketone)s
Yiyang Gu,Zhen Zhao,Danming Chao,Xincai Liu 한국고분자학회 2020 Macromolecular Research Vol.28 No.5
Stimuli-response materials have attracted considerable attention due to their potential applications in sensoring, smart coatings, and intelligent devices. Herein a novel thermo-photo staged response shape memory poly(aryl ether ketone) bearing flexible alkyl segments and azobenzene groups was successfully designed and synthesized. Its chemical structure, thermostability and mechanical properties were characterized through Fourier Transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, thermal gravimetric analysis and dynamic mechanical analysis. The resultant polymer disclosed thermo-/photo-dual stimuli-response behaviors, ascribed to its unique chemical structure. Firstly, the polymer film exhibited good thermal response shape memory effect with satisfied shape fixity ratio (R f) and shape recovery ratio (R r) (>99%). Moreover, an interesting photo-thermo twostaged responsive shape memory behavior with bending deformation over 100° upon the exposure of ultraviolet light and recovering to its original state through thermal treatment was revealed, attributed to the transcis isomerization of azobenzene groups.
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Yi Yang,Zhuangning Xie,Tim K.T. Tse,Xinyang Jin,Ming Gu 한국풍공학회 2012 Wind and Structures, An International Journal (WAS Vol.15 No.5
In this paper, the method of introducing additional source/sink terms in the turbulence and momentum transport equations was applied to appropriately model the effect of the tree canopy. At first, the new additional source term for the turbulence frequency ω equation in the SST k-ω model was proposed through theoretical analogy. Then the new source/sink term model for the SST k-ω model was numerically verified. At last, the proposed source term model was adopted in the wind environment optimal design of the twin high-rise buildings of CABR (China Academy of Building Research). Based on the numerical simulations, the technical measure to ameliorate the wind environment was proposed. Using the new inflow boundary conditions developed in the previous studies, it was concluded that the theoretically reasonable source term model of the SST k-ω model was applicable for modeling the tree canopy flow and accurate numerical results are obtained.
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Yi Yang,Zhuangning Xie,Ming Gu 한국풍공학회 2017 Wind and Structures, An International Journal (WAS Vol.24 No.5
Modelling an equilibrium atmospheric boundary layer (ABL) in computational wind engineering (CWE) and relevant areas requires the boundary conditions, the turbulence model and associated constants to be consistent with each other. Among them, the inflow boundary conditions play an important role and determine whether the equations of the turbulence model are satisfied in the whole domain. In this paper, the idea of modeling an equilibrium ABL through specifying proper inflow boundary conditions is extended to the SST k-ω model, which is regarded as a better RANS model for simulating the blunt body flow than the standard k- model. Two new sets of inflow boundary conditions corresponding to different descriptions of the inflow velocity profiles, the logarithmic law and the power law respectively, are then theoretically proposed and numerically verified. A method of determining the undetermined constants and a set of parameter system are then given, which are suitable for the standard wind terrains defined in the wind load code. Finally, the full inflow boundary condition equations considering the scale effect are presented for the purpose of general use.
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