Key Engineering Materials Vol. 873

Abstract: Thermo-responsive random copolymer poly (2-(2-methoxyethoxy) ethoxyethyl methacrylate-co-poly (ethylene glycol) methyl ether methacrylate), abbreviated as P(MEO₂MA-co-OEGMA₃₀₀) was synthesized by 2-(2-methoxyethoxy) ethoxyethyl methacrylate (MEO₂MA) and poly (ethylene glycol) methyl ether methacrylate (OEGMA₃₀₀) with a molar ratio of 1:1 via atom transfer radical polymerization (ATRP). The structure of P(MEO₂MA-co-OEGMA₃₀₀) was confirmed by ¹H NMR and GPC. The transition behaviors of P(MEO₂MA-co-OEGMA₃₀₀) in aqueous solution were investigated by UV-Vis and DLS. While the transition behaviors of P(MEO₂MA-co-OEGMA₃₀₀) thin films were probed by white light interferometry. Compared to the P(MEO₂MA-co-OEGMA₃₀₀) in solution, it shows a much broader transition region, which is a promising candidate for the slow release of drug in the field of medicine.

Abstract: Extensive concerns on environmental protection have provoked low-carbon buildings to be the mainstream of building construction worldwide, and wooden structures in this sense outperform other structural forms. Wooden-concrete hybrid structures featuring distinct wooden and concrete stories typically exhibit uneven stiffness distribution along the structure height; in particular, abrupt stiffness changes occur at the wood-concrete transition stories. Therefore, structural designing of such hybrid structures must consider a stiffness amplification effect in the static structural calculation as well as complicated procedures in the dynamic analysis. To determine an appropriate amplification factor for design purpose, this study employed a dynamic numerical approach to determine the displacement response of wooden-concrete hybrid buildings and compared the results with the displacement response obtained from static analyses. According to the results, it is found that the appropriate amplification factor should beα= f (x) = 0.47x + 1.00.αcan be valued 1.94 at 2nd floor, 2.41 at 3rd floor and 2.88 at 4th floor. The results may serve as a reference for seismic designing of wooden-concrete hybrid structures.