http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Minghao Li,Jinhye Bae 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Swelling and deswelling behaviors of stimuli-responsive composite hydrogels are critical for their use in soft robotics and biomedical applications. However, typical additives such as gold and iron oxide nanoparticles are not involved with polymer networks, limiting the design of three-dimensional (3D) shape morphing and actuation. Owing to the amphiphilicity of graphene oxide (GO), it has been used as a photothermal additive in temperature-responsive poly(N-isopropylacrylamide) (PNIPAM) hydrogel. We demonstrate a GO-PNIPAM composite hydrogels with tunable swelling and deswelling behaviors by controlling the concentration of GO and chemical crosslinker, and the rate of external temperature change. The linear deswelling ratio change is more than 20% upon different heating process. We anticipate the internal microstructure as a function of concentrations of GO and chemical crosslinkers explain their different swelling and deswelling ratios. Furthermore, the light-driven 3D shape deformation of GO-PNIPAM is demonstrated by utilizing the photothermal properties of GO.
Structure-Mechanical Property Relationships of 3D-Printed Porous Polydimethylsiloxane
Jiayu Zhao,Rebekah Woo,Grace Chen,Jinhye Bae 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
We studied the structure-mechanical property relationship to demonstrate the highly tunable mechanical properties of printed porous PDMS via direct ink writing. To enable 3D printing, we develop a porous PDMS ink consisting of a PDMS precursor, silicone oil, dibutyl phthalate (DBP), and fumed silica nanoparticles by tuning the rheological behaviors. The rheological impact of each component was characterized by viscosity, storage modulus and loss modulus measurements. The porous structures in PDMS are subsequently generated by the removal of DBP in the cured PDMS matrix and characterized by scanning electron microscopy. Mechanical characterization exhibits that the printed sample using the porous PDMS precursor has enhanced stiffness, strength, toughness, and ductility compared to the nonporous PDMS sample. Notably, a broad range of mechanical properties is achieved by varying structural parameters (i.e. , infill densities and printing patterns) for 3D printing of a single porous PDMS material system, which provides insight for designing adaptive soft robots and actuators that can integrate different mechanical properties into a single device by simply changing the structural parameters.